Updated 7 h ago

Vulnerability database

Every flaw the U.S. government’s cybersecurity agency (CISA) has confirmed attackers are using, plus the new WordPress plugin and theme bugs published each day, sorted by what they mean for a small business. We refresh it twice a day. If you see something your website or office runs, tell us.

1,762exploited flaws on CISA’s list

34added in the last 30 days

344new WordPress flaws this week

390,080entries in the database

207 results · page 2 of 5

Sep 13, 2023A vulnerability in the iPXE boot function of Cisco IOS XR software could allow an authenticated, local attacker to install an unverified software image on an afCVE-2023-20236 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 6.7
A vulnerability in the iPXE boot function of Cisco IOS XR software could allow an authenticated, local attacker to install an unverified software image on an affected device. This vulnerability is due to insufficient image verification. An attacker could exploit this vulnerability by manipulating the boot parameters for image verification during the iPXE boot process on an affected device. A successful exploit could allow the attacker to boot an unverified software image on the affected device.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record sec.cloudapps.cisco.com sec.cloudapps.cisco.com
Sep 13, 2023A vulnerability in the Connectivity Fault Management (CFM) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial ofCVE-2023-20233 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 4.3
A vulnerability in the Connectivity Fault Management (CFM) feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. This vulnerability is due to incorrect processing of invalid continuity check messages (CCMs). An attacker could exploit this vulnerability by sending crafted CCMs to an affected device. A successful exploit could allow the attacker to cause the CFM service to crash when a user displays information about maintenance end points (MEPs) for peer MEPs on an affected device.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record sec.cloudapps.cisco.com sec.cloudapps.cisco.com
Sep 13, 2023A vulnerability in the access control list (ACL) processing on MPLS interfaces in the ingress direction of Cisco IOS XR Software could allow an unauthenticated,CVE-2023-20191 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 5.8
A vulnerability in the access control list (ACL) processing on MPLS interfaces in the ingress direction of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass a configured ACL. This vulnerability is due to incomplete support for this feature. An attacker could exploit this vulnerability by attempting to send traffic through an affected device. A successful exploit could allow the attacker to bypass an ACL on the affected device. There are workarounds that address this vulnerability. This advisory is part of the September 2023 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2023 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication .
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record sec.cloudapps.cisco.com sec.cloudapps.cisco.com
Sep 13, 2023A vulnerability in the classic access control list (ACL) compression feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass CVE-2023-20190 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 5.8
A vulnerability in the classic access control list (ACL) compression feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to bypass the protection that is offered by a configured ACL on an affected device. This vulnerability is due to incorrect destination address range encoding in the compression module of an ACL that is applied to an interface of an affected device. An attacker could exploit this vulnerability by sending traffic through the affected device that should be denied by the configured ACL. A successful exploit could allow the attacker to bypass configured ACL protections on the affected device, allowing the attacker to access trusted networks that the device might be protecting. There are workarounds that address this vulnerability. This advisory is part of the September 2023 release of the Cisco IOS XR Software Security Advisory Bundled Publication. For a complete list of the advisories and links to them, see Cisco Event Response: September 2023 Semiannual Cisco IOS XR Software Security Advisory Bundled Publication .
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record sec.cloudapps.cisco.com sec.cloudapps.cisco.com
Sep 13, 2023A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operCVE-2023-20135 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 5.7
A vulnerability in Cisco IOS XR Software image verification checks could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. This vulnerability is due to a time-of-check, time-of-use (TOCTOU) race condition when an install query regarding an ISO image is performed during an install operation that uses an ISO image. An attacker could exploit this vulnerability by modifying an ISO image and then carrying out install requests in parallel. A successful exploit could allow the attacker to execute arbitrary code on an affected device.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record sec.cloudapps.cisco.com sec.cloudapps.cisco.com
Mar 9, 2023A vulnerability in the GRand Unified Bootloader (GRUB) for Cisco IOS XR Software could allow an unauthenticated attacker with physical access to the device to vCVE-2023-20064 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 4.6
A vulnerability in the GRand Unified Bootloader (GRUB) for Cisco IOS XR Software could allow an unauthenticated attacker with physical access to the device to view sensitive files on the console using the GRUB bootloader command line. This vulnerability is due to the inclusion of unnecessary commands within the GRUB environment that allow sensitive files to be viewed. An attacker could exploit this vulnerability by being connected to the console port of the Cisco IOS XR device when the device is power-cycled. A successful exploit could allow the attacker to view sensitive files that could be used to conduct additional attacks against the device.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record sec.cloudapps.cisco.com sec.cloudapps.cisco.com
Mar 9, 2023A vulnerability in the bidirectional forwarding detection (BFD) hardware offload feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation ServicesCVE-2023-20049 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 8.6
A vulnerability in the bidirectional forwarding detection (BFD) hardware offload feature of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers, ASR 9902 Compact High-Performance Routers, and ASR 9903 Compact High-Performance Routers could allow an unauthenticated, remote attacker to cause a line card to reset, resulting in a denial of service (DoS) condition. This vulnerability is due to the incorrect handling of malformed BFD packets that are received on line cards where the BFD hardware offload feature is enabled. An attacker could exploit this vulnerability by sending a crafted IPv4 BFD packet to an affected device. A successful exploit could allow the attacker to cause line card exceptions or a hard reset, resulting in loss of traffic over that line card while the line card reloads.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record sec.cloudapps.cisco.com sec.cloudapps.cisco.com
May 26, 2022Cisco IOS XR Open Port VulnerabilityCVE-2022-20821 · Network & remote access · Cisco · reported by psirt@cisco.comExploitedMedium 6.5
Cisco IOS XR software health check opens TCP port 6379 by default on activation. An attacker can connect to the Redis instance on the open port and allow access to the Redis instance that is running within the NOSi container.
Product
IOS XR
On CISA’s list since
May 23, 2022 (federal fix deadline Jun 13, 2022)
What to do
Attackers are using this now. Install Cisco’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.
Full record and what to do →NVD record CISA catalog tools.cisco.com tools.cisco.com
Apr 15, 2022A vulnerability in the implementation of the Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticCVE-2022-20758 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 6.8
A vulnerability in the implementation of the Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. This vulnerability is due to the incorrect processing of a BGP update message that contains specific EVPN attributes. An attacker could exploit this vulnerability by sending a BGP update message that contains specific EVPN attributes. To exploit this vulnerability, an attacker must control a BGP speaker that has an established trusted peer connection to an affected device that is configured with the address family L2VPN EVPN to receive and process the update message. This vulnerability cannot be exploited by any data that is initiated by clients on the Layer 2 network or by peers that are not configured to accept the L2VPN EVPN address family. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP updates only from explicitly defined peers. For this vulnerability to be exploited, the malicious BGP update message must either come from a
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Apr 15, 2022A vulnerability in the data plane microcode of Lightspeed-Plus line cards for Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated,CVE-2022-20714 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 8.6
A vulnerability in the data plane microcode of Lightspeed-Plus line cards for Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause the line card to reset. This vulnerability is due to the incorrect handling of malformed packets that are received on the Lightspeed-Plus line cards. An attacker could exploit this vulnerability by sending a crafted IPv4 or IPv6 packet through an affected device. A successful exploit could allow the attacker to cause the Lightspeed-Plus line card to reset, resulting in a denial of service (DoS) condition for any traffic that traverses that line card.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 22, 2021A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco FXOS Software, Cisco IOS Software, Cisco IOS XE Software, Cisco IOS XR Software, anCVE-2021-34714 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 7.4
A vulnerability in the Unidirectional Link Detection (UDLD) feature of Cisco FXOS Software, Cisco IOS Software, Cisco IOS XE Software, Cisco IOS XR Software, and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause an affected device to reload. This vulnerability is due to improper input validation of the UDLD packets. An attacker could exploit this vulnerability by sending specifically crafted UDLD packets to an affected device. A successful exploit could allow the attacker to cause the affected device to reload, resulting in a denial of service (DoS) condition. Note: The UDLD feature is disabled by default, and the conditions to exploit this vulnerability are strict. An attacker must have full control of a directly connected device. On Cisco IOS XR devices, the impact is limited to the reload of the UDLD process.
Product
Cisco IOS
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 9, 2021A vulnerability in the Cisco IOS XR Software CLI could allow an authenticated, local attacker to view more information than their privileges allow.CVE-2021-34771 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 5.5
A vulnerability in the Cisco IOS XR Software CLI could allow an authenticated, local attacker to view more information than their privileges allow. This vulnerability is due to insufficient application of restrictions during the execution of a specific command. An attacker could exploit this vulnerability by running a specific command. A successful exploit could allow the attacker to view sensitive configuration information that their privileges might not otherwise allow them to access.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 9, 2021A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of theCVE-2021-34737 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 5.8
A vulnerability in the DHCP version 4 (DHCPv4) server feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to trigger a crash of the dhcpd process, resulting in a denial of service (DoS) condition. This vulnerability exists because certain DHCPv4 messages are improperly validated when they are processed by an affected device. An attacker could exploit this vulnerability by sending a malformed DHCPv4 message to an affected device. A successful exploit could allow the attacker to cause a NULL pointer dereference, resulting in a crash of the dhcpd process. While the dhcpd process is restarting, which may take up to approximately two minutes, DHCPv4 server services are unavailable on the affected device. This could temporarily prevent network access to clients that join the network during that time period. Note: Only the dhcpd process crashes and eventually restarts automatically. The router does not reload.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 9, 2021Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker with a low-privileged account to elevate privileges onCVE-2021-34728 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 7.8
Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker with a low-privileged account to elevate privileges on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 9, 2021Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to gain access to the underlying root shell of an affeCVE-2021-34722 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 6.7
Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to gain access to the underlying root shell of an affected device and execute arbitrary commands with root privileges. For more information about these vulnerabilities, see the Details section of this advisory.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 9, 2021Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to gain access to the underlying root shell of an affeCVE-2021-34721 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 6.7
Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to gain access to the underlying root shell of an affected device and execute arbitrary commands with root privileges. For more information about these vulnerabilities, see the Details section of this advisory.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 9, 2021A vulnerability in the IP Service Level Agreements (IP SLA) responder and Two-Way Active Measurement Protocol (TWAMP) features of Cisco IOS XR Software could alCVE-2021-34720 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 8.6
A vulnerability in the IP Service Level Agreements (IP SLA) responder and Two-Way Active Measurement Protocol (TWAMP) features of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause device packet memory to become exhausted or cause the IP SLA process to crash, resulting in a denial of service (DoS) condition. This vulnerability exists because socket creation failures are mishandled during the IP SLA and TWAMP processes. An attacker could exploit this vulnerability by sending specific IP SLA or TWAMP packets to an affected device. A successful exploit could allow the attacker to exhaust the packet memory, which will impact other processes, such as routing protocols, or crash the IP SLA process.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 9, 2021Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker with a low-privileged account to elevate privileges onCVE-2021-34719 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 7.8
Multiple vulnerabilities in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker with a low-privileged account to elevate privileges on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 9, 2021A vulnerability in the SSH Server process of Cisco IOS XR Software could allow an authenticated, remote attacker to overwrite and read arbitrary files on the loCVE-2021-34718 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 8.1
A vulnerability in the SSH Server process of Cisco IOS XR Software could allow an authenticated, remote attacker to overwrite and read arbitrary files on the local device. This vulnerability is due to insufficient input validation of arguments that are supplied by the user for a specific file transfer method. An attacker with lower-level privileges could exploit this vulnerability by specifying Secure Copy Protocol (SCP) parameters when authenticating to a device. A successful exploit could allow the attacker to elevate their privileges and retrieve and upload files on a device that they should not have access to.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 9, 2021A vulnerability in the Layer 2 punt code of Cisco IOS XR Software running on Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, CVE-2021-34713 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 7.4
A vulnerability in the Layer 2 punt code of Cisco IOS XR Software running on Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, adjacent attacker to cause the affected line card to reboot. This vulnerability is due to incorrect handling of specific Ethernet frames that cause a spin loop that can make the network processors unresponsive. An attacker could exploit this vulnerability by sending specific types of Ethernet frames on the segment where the affected line cards are attached. A successful exploit could allow the attacker to cause the affected line card to reboot.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 9, 2021Multiple vulnerabilities in image verification checks of Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L softwCVE-2021-34709 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 6
Multiple vulnerabilities in image verification checks of Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for Cisco 8000 Series Routers could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. For more information about these vulnerabilities, see the Details section of this advisory.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 9, 2021Multiple vulnerabilities in image verification checks of Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L softwCVE-2021-34708 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 6
Multiple vulnerabilities in image verification checks of Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for Cisco 8000 Series Routers could allow an authenticated, local attacker to execute arbitrary code on the underlying operating system. For more information about these vulnerabilities, see the Details section of this advisory.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Apr 8, 2021A vulnerability in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to inject arbitrary commands that are executed with root privilCVE-2021-1485 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 6.6
A vulnerability in the CLI of Cisco IOS XR Software could allow an authenticated, local attacker to inject arbitrary commands that are executed with root privileges on the underlying Linux operating system (OS) of an affected device. This vulnerability is due to insufficient input validation of commands that are supplied by the user. An attacker could exploit this vulnerability by authenticating to a device and submitting crafted input to an affected command. A successful exploit could allow the attacker to execute commands on the underlying Linux OS with root privileges.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Feb 4, 2021A vulnerability in the IPv6 traffic processing of Cisco IOS XR Software and Cisco NX-OS Software for certain Cisco devices could allow an unauthenticated, remotCVE-2021-1389 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 5.8
A vulnerability in the IPv6 traffic processing of Cisco IOS XR Software and Cisco NX-OS Software for certain Cisco devices could allow an unauthenticated, remote attacker to bypass an IPv6 access control list (ACL) that is configured for an interface of an affected device. The vulnerability is due to improper processing of IPv6 traffic that is sent through an affected device. An attacker could exploit this vulnerability by sending crafted IPv6 packets that traverse the affected device. A successful exploit could allow the attacker to access resources that would typically be protected by the interface ACL.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Feb 4, 2021A vulnerability in a CLI command of Cisco IOS XR Software for the Cisco 8000 Series Routers and Network Convergence System 540 Series Routers running NCS540L soCVE-2021-1370 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 7.8
A vulnerability in a CLI command of Cisco IOS XR Software for the Cisco 8000 Series Routers and Network Convergence System 540 Series Routers running NCS540L software images could allow an authenticated, local attacker to elevate their privilege to root. To exploit this vulnerability, an attacker would need to have a valid account on an affected device. The vulnerability is due to insufficient validation of command line arguments. An attacker could exploit this vulnerability by authenticating to the device and entering a crafted command at the prompt. A successful exploit could allow an attacker with low-level privileges to escalate their privilege level to root.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Feb 4, 2021Multiple vulnerabilities in the ingress packet processing function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial ofCVE-2021-1313 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 8.6
Multiple vulnerabilities in the ingress packet processing function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Feb 4, 2021Multiple vulnerabilities in the ingress packet processing function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial ofCVE-2021-1288 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 8.6
Multiple vulnerabilities in the ingress packet processing function of Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Feb 4, 2021A vulnerability in the IPv6 protocol handling of the management interfaces of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause aCVE-2021-1268 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 7.4
A vulnerability in the IPv6 protocol handling of the management interfaces of Cisco IOS XR Software could allow an unauthenticated, adjacent attacker to cause an IPv6 flood on the management interface network of an affected device. The vulnerability exists because the software incorrectly forwards IPv6 packets that have an IPv6 node-local multicast group address destination and are received on the management interfaces. An attacker could exploit this vulnerability by connecting to the same network as the management interfaces and injecting IPv6 packets that have an IPv6 node-local multicast group address destination. A successful exploit could allow the attacker to cause an IPv6 flood on the corresponding network. Depending on the number of Cisco IOS XR Software nodes on that network segment, exploitation could cause excessive network traffic, resulting in network degradation or a denial of service (DoS) condition.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Feb 4, 2021Multiple vulnerabilities in Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR CVE-2021-1244 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 6.7
Multiple vulnerabilities in Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for the Cisco 8000 Series Routers could allow an authenticated, local attacker to execute unsigned code during the boot process on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Feb 4, 2021A vulnerability in the Local Packet Transport Services (LPTS) programming of the SNMP with the management plane protection feature of Cisco IOS XR Software coulCVE-2021-1243 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 5.3
A vulnerability in the Local Packet Transport Services (LPTS) programming of the SNMP with the management plane protection feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to allow connections despite the management plane protection that is configured to deny access to the SNMP server of an affected device. This vulnerability is due to incorrect LPTS programming when using SNMP with management plane protection. An attacker could exploit this vulnerability by connecting to an affected device using SNMP. A successful exploit could allow the attacker to connect to the device on the configured SNMP ports. Valid credentials are required to execute any of the SNMP requests.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Feb 4, 2021Multiple vulnerabilities in Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR CVE-2021-1136 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 6.7
Multiple vulnerabilities in Cisco Network Convergence System (NCS) 540 Series Routers, only when running Cisco IOS XR NCS540L software images, and Cisco IOS XR Software for the Cisco 8000 Series Routers could allow an authenticated, local attacker to execute unsigned code during the boot process on an affected device. For more information about these vulnerabilities, see the Details section of this advisory.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Feb 4, 2021A vulnerability in the CLI parser of Cisco IOS XR Software could allow an authenticated, local attacker to view more information than their privileges allow.CVE-2021-1128 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 5.5
A vulnerability in the CLI parser of Cisco IOS XR Software could allow an authenticated, local attacker to view more information than their privileges allow. The vulnerability is due to insufficient application of restrictions during the execution of a specific command. An attacker could exploit this vulnerability by using a specific command at the command line. A successful exploit could allow the attacker to obtain sensitive information within the configuration that otherwise might not have been accessible beyond the privileges of the invoking user.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Nov 11, 2020A vulnerability in the ingress packet processing function of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers could allow an unautheCVE-2020-26070 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 8.6
A vulnerability in the ingress packet processing function of Cisco IOS XR Software for Cisco ASR 9000 Series Aggregation Services Routers could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition on an affected device. The vulnerability is due to improper resource allocation when an affected device processes network traffic in software switching mode (punted). An attacker could exploit this vulnerability by sending specific streams of Layer 2 or Layer 3 protocol data units (PDUs) to an affected device. A successful exploit could cause the affected device to run out of buffer resources, which could make the device unable to process or forward traffic, resulting in a DoS condition. The device would need to be restarted to regain functionality.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Nov 6, 2020A vulnerability in the enhanced Preboot eXecution Environment (PXE) boot loader for Cisco IOS XR 64-bit Software could allow an unauthenticated, remote attackerCVE-2020-3284 · Network & remote access · Cisco · reported by psirt@cisco.comCritical 9.8
A vulnerability in the enhanced Preboot eXecution Environment (PXE) boot loader for Cisco IOS XR 64-bit Software could allow an unauthenticated, remote attacker to execute unsigned code during the PXE boot process on an affected device. The PXE boot loader is part of the BIOS and runs over the management interface of hardware platforms that are running Cisco IOS XR Software only. The vulnerability exists because internal commands that are issued when the PXE network boot process is loading a software image are not properly verified. An attacker could exploit this vulnerability by compromising the PXE boot server and replacing a valid software image with a malicious one. Alternatively, the attacker could impersonate the PXE boot server and send a PXE boot reply with a malicious file. A successful exploit could allow the attacker to execute unsigned code on the affected device. Note: To fix this vulnerability, both the Cisco IOS XR Software and the BIOS must be upgraded. The BIOS code is included in Cisco IOS XR Software but might require additional installation steps. For further information, see the Fixed Software section of this advisory.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 22, 2020Cisco IOS XR Software DVMRP Memory Exhaustion VulnerabilityCVE-2020-3569 · Network & remote access · Cisco · reported by psirt@cisco.comExploitedHigh 8.6
Cisco IOS XR Distance Vector Multicast Routing Protocol (DVMRP) incorrectly handles Internet Group Management Protocol (IGMP) packets. Exploitation could allow an unauthenticated, remote attacker to immediately crash the IGMP process or make it consume available memory and eventually crash.
Product
IOS XR
On CISA’s list since
Nov 3, 2021 (federal fix deadline May 3, 2022)
What to do
Attackers are using this now. Install Cisco’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.
Full record and what to do →NVD record CISA catalog tools.cisco.com tools.cisco.com
Sep 22, 2020Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthCVE-2019-16023 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 7.5
Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerabilities are due to incorrect processing of BGP update messages that contain crafted EVPN attributes. An attacker could exploit these vulnerabilities by sending BGP EVPN update messages with malformed attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit these vulnerabilities, the malicious BGP update message would need to come from a configured, valid BGP peer, or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 22, 2020Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthCVE-2019-16021 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 7.5
Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerabilities are due to incorrect processing of BGP update messages that contain crafted EVPN attributes. An attacker could exploit these vulnerabilities by sending BGP EVPN update messages with malformed attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit these vulnerabilities, the malicious BGP update message would need to come from a configured, valid BGP peer, or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 22, 2020Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthCVE-2019-16019 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 8.6
Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerabilities are due to incorrect processing of BGP update messages that contain crafted EVPN attributes. An attacker could exploit these vulnerabilities by sending BGP EVPN update messages with malformed attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit these vulnerabilities, the malicious BGP update message would need to come from a configured, valid BGP peer, or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 3, 2020A vulnerability in task group assignment for a specific CLI command in Cisco IOS XR Software could allow an authenticated, local attacker to execute that commanCVE-2020-3530 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 8.4
A vulnerability in task group assignment for a specific CLI command in Cisco IOS XR Software could allow an authenticated, local attacker to execute that command, even though administrative privileges should be required. The attacker must have valid credentials on the affected device. The vulnerability is due to incorrect mapping in the source code of task group assignments for a specific command. An attacker could exploit this vulnerability by issuing the command, which they should not be authorized to issue, on an affected device. A successful exploit could allow the attacker to invalidate the integrity of the disk and cause the device to restart. This vulnerability could allow a user with read permissions to issue a specific command that should require Administrator privileges.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Sep 3, 2020A vulnerability in task group assignment for a specific CLI command in Cisco IOS XR Software could allow an authenticated, local CLI shell user to elevate priviCVE-2020-3473 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 7.8
A vulnerability in task group assignment for a specific CLI command in Cisco IOS XR Software could allow an authenticated, local CLI shell user to elevate privileges and gain full administrative control of the device. The vulnerability is due to incorrect mapping of a command to task groups within the source code. An attacker could exploit this vulnerability by first authenticating to the local CLI shell on the device and using the CLI command to bypass the task group–based checks. A successful exploit could allow the attacker to elevate privileges and perform actions on the device without authorization checks.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Aug 29, 2020Cisco IOS XR Software DVMRP Memory Exhaustion VulnerabilityCVE-2020-3566 · Network & remote access · Cisco · reported by psirt@cisco.comExploitedHigh 8.6
Cisco IOS XR Distance Vector Multicast Routing Protocol (DVMRP) incorrectly handles Internet Group Management Protocol (IGMP) packets. Exploitation could allow an unauthenticated, remote attacker to immediately crash the IGMP process or make it consume available memory and eventually crash.
Product
IOS XR
On CISA’s list since
Nov 3, 2021 (federal fix deadline May 3, 2022)
What to do
Attackers are using this now. Install Cisco’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.
Full record and what to do →NVD record CISA catalog tools.cisco.com tools.cisco.com
Aug 17, 2020A vulnerability in the Border Gateway Protocol (BGP) additional paths feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevenCVE-2020-3449 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 4.3
A vulnerability in the Border Gateway Protocol (BGP) additional paths feature of Cisco IOS XR Software could allow an unauthenticated, remote attacker to prevent authorized users from monitoring the BGP status and cause the BGP process to stop processing new updates, resulting in a denial of service (DOS) condition. The vulnerability is due to an incorrect calculation of lexicographical order when displaying additional path information within Cisco IOS XR Software, which causes an infinite loop. An attacker could exploit this vulnerability by sending a specific BGP update from a BGP neighbor peer session of an affected device; an authorized user must then issue a show bgp command for the vulnerability to be exploited. A successful exploit could allow the attacker to prevent authorized users from properly monitoring the BGP status and prevent BGP from processing new updates, resulting in outdated information in the routing and forwarding tables.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Jun 17, 2020A vulnerability in the access control list (ACL) functionality of the standby route processor management interface of Cisco IOS XR Software could allow an unautCVE-2020-3364 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 5.3
A vulnerability in the access control list (ACL) functionality of the standby route processor management interface of Cisco IOS XR Software could allow an unauthenticated, remote attacker to reach the configured IP addresses on the standby route processor management Gigabit Ethernet Management interface. The vulnerability is due to a logic error that was introduced in the Cisco IOS XR Software, which prevents the ACL from working when applied against the standby route processor management interface. An attacker could exploit this vulnerability by attempting to access the device through the standby route processor management interface.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Jun 3, 2020A vulnerability in the Topology Discovery Service of Cisco One Platform Kit (onePK) in Cisco IOS Software, Cisco IOS XE Software, Cisco IOS XR Software, and CisCVE-2020-3217 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 8.8
A vulnerability in the Topology Discovery Service of Cisco One Platform Kit (onePK) in Cisco IOS Software, Cisco IOS XE Software, Cisco IOS XR Software, and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to execute arbitrary code or cause a denial of service (DoS) condition on an affected device. The vulnerability is due to insufficient length restrictions when the onePK Topology Discovery Service parses Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol message to an affected device. An exploit could allow the attacker to cause a stack overflow, which could allow the attacker to execute arbitrary code with administrative privileges, or to cause a process crash, which could result in a reload of the device and cause a DoS condition.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Mar 4, 2020A vulnerability in the IPsec packet processor of Cisco IOS XR Software could allow an unauthenticated remote attacker to cause a denial of service (DoS) conditiCVE-2020-3190 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 5.8
A vulnerability in the IPsec packet processor of Cisco IOS XR Software could allow an unauthenticated remote attacker to cause a denial of service (DoS) condition for IPsec sessions to an affected device. The vulnerability is due to improper handling of packets by the IPsec packet processor. An attacker could exploit this vulnerability by sending malicious ICMP error messages to an affected device that get punted to the IPsec packet processor. A successful exploit could allow the attacker to deplete IPsec memory, resulting in all future IPsec packets to an affected device being dropped by the device. Manual intervention is required to recover from this situation.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Feb 5, 2020A vulnerability in the Cisco Discovery Protocol implementation for Cisco FXOS Software, Cisco IOS XR Software, and Cisco NX-OS Software could allow an unauthentCVE-2020-3120 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 6.5
A vulnerability in the Cisco Discovery Protocol implementation for Cisco FXOS Software, Cisco IOS XR Software, and Cisco NX-OS Software could allow an unauthenticated, adjacent attacker to cause a reload of an affected device, resulting in a denial of service (DoS) condition. The vulnerability is due to a missing check when the affected software processes Cisco Discovery Protocol messages. An attacker could exploit this vulnerability by sending a malicious Cisco Discovery Protocol packet to an affected device. A successful exploit could allow the attacker to exhaust system memory, causing the device to reload. Cisco Discovery Protocol is a Layer 2 protocol. To exploit this vulnerability, an attacker must be in the same broadcast domain as the affected device (Layer 2 adjacent).
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record packetstormsecurity.com tools.cisco.com
Feb 5, 2020Cisco IOS XR Software Discovery Protocol Format String VulnerabilityCVE-2020-3118 · Network & remote access · Cisco · reported by psirt@cisco.comExploitedHigh 8.8
Cisco IOS XR improperly validates string input from certain fields in Cisco Discovery Protocol messages. Exploitation could allow an unauthenticated, adjacent attacker to execute code with administrative privileges or cause a reload on an affected device.
Product
IOS XR
On CISA’s list since
Nov 3, 2021 (federal fix deadline May 3, 2022)
What to do
Attackers are using this now. Install Cisco’s update today. If there is no update for your version, take the product off the internet or stop using it until there is.
Full record and what to do →NVD record CISA catalog packetstormsecurity.com tools.cisco.com
Jan 26, 2020A vulnerability in the implementation of the Intermediate System–to–Intermediate System (IS–IS) routing protocol functionality in Cisco IOS XRCVE-2019-16027 · Network & remote access · Cisco · reported by psirt@cisco.comMedium 6.5
A vulnerability in the implementation of the Intermediate System–to–Intermediate System (IS–IS) routing protocol functionality in Cisco IOS XR Software could allow an authenticated, remote attacker to cause a denial of service (DoS) condition in the IS–IS process. The vulnerability is due to improper handling of a Simple Network Management Protocol (SNMP) request for specific Object Identifiers (OIDs) by the IS–IS process. An attacker could exploit this vulnerability by sending a crafted SNMP request to the affected device. A successful exploit could allow the attacker to cause a DoS condition in the IS–IS process.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Jan 26, 2020Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthCVE-2019-16022 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 8.6
Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerabilities are due to incorrect processing of BGP update messages that contain crafted EVPN attributes. An attacker could exploit these vulnerabilities by sending BGP EVPN update messages with malformed attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit these vulnerabilities, the malicious BGP update message would need to come from a configured, valid BGP peer, or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com
Jan 26, 2020Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthCVE-2019-16020 · Network & remote access · Cisco · reported by psirt@cisco.comHigh 8.6
Multiple vulnerabilities in the implementation of Border Gateway Protocol (BGP) Ethernet VPN (EVPN) functionality in Cisco IOS XR Software could allow an unauthenticated, remote attacker to cause a denial of service (DoS) condition. The vulnerabilities are due to incorrect processing of BGP update messages that contain crafted EVPN attributes. An attacker could exploit these vulnerabilities by sending BGP EVPN update messages with malformed attributes to be processed by an affected system. A successful exploit could allow the attacker to cause the BGP process to restart unexpectedly, resulting in a DoS condition. The Cisco implementation of BGP accepts incoming BGP traffic only from explicitly defined peers. To exploit these vulnerabilities, the malicious BGP update message would need to come from a configured, valid BGP peer, or would need to be injected by the attacker into the victim's BGP network on an existing, valid TCP connection to a BGP peer.
Product
Cisco IOS XR Software
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record tools.cisco.com tools.cisco.com

Where this comes from: the exploited list is CISA’s Known Exploited Vulnerabilities catalog. Everything else is the whole National Vulnerability Database, where each record is published by the team that found the bug (Wordfence, Patchstack, WPScan, the vendors themselves and others); we show who. Exploit odds are FIRST’s EPSS, updated daily. Titles and categories are ours, so check the linked record before acting on a detail. For a write-up of the big ones, see our advisories. Every vendor, and every WordPress plugin and theme with a recorded flaw, also has its own page. All of it is free to reuse as JSON, CSV or RSS.

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