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.
10 results
Oct 18, 2026lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response that allows adjacent attackers to corrupt stack memory by sending CVE-2026-112062 · Other software · lwIP · reported by VulnCheckMedium 6
lwIP through 2.2.1 contains a stack out-of-bounds write vulnerability in mdns_handle_response that allows adjacent attackers to corrupt stack memory by sending mDNS responses with invalid domain names. Attackers on the local link can send multicast PTR answers with oversized RDLENGTH or SRV answers with RDLENGTH below 6 during a service search, overflowing a 256-byte stack buffer and crashing the device.
- Product
- lwIP
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Oct 9, 2026lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.CVE-2026-15340 · Other software · Savannah · reported by ics-cert@hq.dhs.govCritical 9.3
lwIP SMTP client does not check the size of inputs, potentially allowing a buffer overflow.
- Product
- lwIP SMTP client
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Sep 29, 2026U-Boot before 2026.10-rc5 contains a use-after-free vulnerability in the httpc_recv_cb() function within the lwIP wget implementation.CVE-2026-74222 · Other software · u-boot · reported by VulnCheckHigh 8.8
U-Boot before 2026.10-rc5 contains a use-after-free vulnerability in the httpc_recv_cb() function within the lwIP wget implementation. When HTTP data storage fails, the callback frees the connection PCB but returns ERR_BUF instead of ERR_ABRT, causing the TCP input path to access released memory and crash the bootloader.
- Product
- u-boot
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Sep 22, 2026lwIP (Lightweight IP) has a double free vulnerability, which could crash the system, cause a DoS, memory corruption, or allow code execution on the victim systeCVE-2026-91018 · Other software · lwIP · reported by ics-cert@hq.dhs.govHigh 8.7
lwIP (Lightweight IP) has a double free vulnerability, which could crash the system, cause a DoS, memory corruption, or allow code execution on the victim system.
- Product
- lwIP API
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordcgit.git.savannah.gnu.orggithub.com
Sep 22, 2026lwIP TCP/IP Stack MQTT is vulnerable to an out-of-bounds write, which may allow an attacker to gain full code execution on the device.CVE-2026-87121 · Other software · lwIP · reported by ics-cert@hq.dhs.govCritical 9.3
lwIP TCP/IP Stack MQTT is vulnerable to an out-of-bounds write, which may allow an attacker to gain full code execution on the device.
- Product
- TCP/IP Stack MQTT
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgithub.comsavannah.nongnu.org
May 18, 2026A vulnerability was found in lwIP up to 2.2.1.CVE-2026-8836 · Other software · reported by VulDBHigh 8.9
A vulnerability was found in lwIP up to 2.2.1. Affected is the function snmp_parse_inbound_frame of the file src/apps/snmp/snmp_msg.c of the component snmpv3 USM Handler. Performing a manipulation of the argument msgAuthenticationParameters results in stack-based buffer overflow. The attack may be initiated remotely. The patch is named 0c957ec03054eb6c8205e9c9d1d05d90ada3898c. It is suggested to install a patch to address this issue. Two separate issue reports were submitted to the project. Their processing was merged as a duplicate.
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordcgit.git.savannah.gnu.orggithub.com
Jul 22, 2021A buffer overflow vulnerability in the zepif_linkoutput() function of Free Software Foundation lwIP git head version and version 2.1.2 allows attackers to accesCVE-2020-22284 · Other software · Lwip Project · reported by MITREHigh 7.5
A buffer overflow vulnerability in the zepif_linkoutput() function of Free Software Foundation lwIP git head version and version 2.1.2 allows attackers to access sensitive information via a crafted 6LoWPAN packet.
- Product
- Lwip
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordsavannah.nongnu.orgsavannah.nongnu.org
Jul 22, 2021A buffer overflow vulnerability in the icmp6_send_response_with_addrs_and_netif() function of Free Software Foundation lwIP version git head allows attackers toCVE-2020-22283 · Other software · Lwip Project · reported by MITREHigh 7.5
A buffer overflow vulnerability in the icmp6_send_response_with_addrs_and_netif() function of Free Software Foundation lwIP version git head allows attackers to access sensitive information via a crafted ICMPv6 packet.
- Product
- Lwip
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordlists.debian.orgsavannah.nongnu.org
Jun 4, 2018prebuild-lwip is a module for comprehensive, fast, and simple image processing and manipulation.CVE-2016-10652 · Other software · HackerOne · reported by support@hackerone.comHigh 8.1
prebuild-lwip is a module for comprehensive, fast, and simple image processing and manipulation. prebuild-lwip downloads resources over HTTP, which leaves it vulnerable to MITM attacks.
- Product
- prebuild-lwip node module
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordnodesecurity.ionodesecurity.io
Nov 27, 2014resolv.c in the DNS resolver in uIP, and dns.c in the DNS resolver in lwIP 1.4.1 and earlier, does not use random values for ID fields and source ports of DNS qCVE-2014-4883 · Other software · Lwip Project · reported by cret@cert.orgMedium 4.3
resolv.c in the DNS resolver in uIP, and dns.c in the DNS resolver in lwIP 1.4.1 and earlier, does not use random values for ID fields and source ports of DNS query packets, which makes it easier for man-in-the-middle attackers to conduct cache-poisoning attacks via spoofed reply packets.
- Product
- Lwip
- What to do
- Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD recordgit.savannah.gnu.orgkb.cert.org
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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