Updated 3 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

333new WordPress flaws this week

390,007entries in the database

28 results

Apr 3, 2026Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite.CVE-2026-34933 · Other software · avahi · reported by GitHubMedium 5.5
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. Prior to version 0.9-rc4, any unprivileged local user can crash avahi-daemon by sending a single D-Bus method call with conflicting publish flags. This issue has been patched in version 0.9-rc4.
Product
avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record github.com github.com
Jan 23, 2026Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite.CVE-2026-24401 · Other software · avahi · reported by GitHubMedium 6.5
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions 0.9rc2 and below, avahi-daemon can be crashed via a segmentation fault by sending an unsolicited mDNS response containing a recursive CNAME record, where the alias and canonical name point to the same domain (e.g., "h.local" as a CNAME for "h.local"). This causes unbounded recursion in the lookup_handle_cname function, leading to stack exhaustion. The vulnerability affects record browsers where AVAHI_LOOKUP_USE_MULTICAST is set explicitly, which includes record browsers created by resolvers used by nss-mdns. This issue is patched in commit 78eab31128479f06e30beb8c1cbf99dd921e2524, which is part of version 0.9-rc3.
Product
avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record github.com github.com
Jan 12, 2026Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite.CVE-2025-68471 · Other software · avahi · reported by GitHubMedium 6.5
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2 and earlier, avahi-daemon can be crashed by sending 2 unsolicited announcements with CNAME resource records 2 seconds apart.
Product
avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record github.com github.com
Jan 12, 2026Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite.CVE-2025-68468 · Other software · avahi · reported by GitHubMedium 6.5
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2 and earlier, avahi-daemon can be crashed by sending unsolicited announcements containing CNAME resource records pointing it to resource records with short TTLs. As soon as they expire avahi-daemon crashes.
Product
avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record github.com github.com
Jan 12, 2026Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite.CVE-2025-68276 · Other software · avahi · reported by GitHubMedium 5.5
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In 0.9-rc2 and earlier, an unprivileged local users can crash avahi-daemon (with wide-area disabled) by creating record browsers with the AVAHI_LOOKUP_USE_WIDE_AREA flag set via D-Bus. This can be done by either calling the RecordBrowserNew method directly or creating hostname/address/service resolvers/browsers that create those browsers internally themselves.
Product
avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record github.com github.com
Dec 18, 2025Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite.CVE-2025-59529 · Other software · avahi · reported by GitHubMedium 5.5
Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. In versions up to and including 0.9-rc5, the simple protocol server ignores the documented client limit and accepts unlimited connections, allowing for easy local DoS. Although `CLIENTS_MAX` is defined, `server_work()` unconditionally `accept()`s and `client_new()` always appends the new client and increments `n_clients`. There is no check against the limit. When client cannot be accepted as a result of maximal socket number of avahi-daemon, it logs unconditionally error per each connection. Unprivileged local users can exhaust daemon memory and file descriptors, causing a denial of service system-wide for mDNS/DNS-SD. Exhausting local file descriptors causes increased system load caused by logging errors of each of request. Overloading prevents glibc calls using nss-mdns plugins to resolve `*.local.` names and link-local addresses. As of time of publication, no known patched versions are available, but a candidate fix is available in pull request 808, and some workarounds are available. Simple clients are offered for nss-mdns package functionality. It is not possible to dis
Product
avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record github.com github.com
Nov 1, 2025/etc/avahi/services/z9.service can be Arbitrarily Written.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5.CVE-2025-12602 · Other software · Azure Access Technology · reported by a0340c66-c385-4f8b-991b-3d05f6fd5220Low 2.3
/etc/avahi/services/z9.service can be Arbitrarily Written.This issue affects BLU-IC2: through 1.19.5; BLU-IC4: through 1.19.5.
Product
BLU-IC2
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record azure-access.com
Nov 21, 2024A flaw was found in the Avahi-daemon, where it initializes DNS transaction IDs randomly only once at startup, incrementing them sequentially after that.CVE-2024-52616 · Other software · Red Hat · reported by Red HatMedium 5.3
A flaw was found in the Avahi-daemon, where it initializes DNS transaction IDs randomly only once at startup, incrementing them sequentially after that. This predictable behavior facilitates DNS spoofing attacks, allowing attackers to guess transaction IDs.
Product
Red Hat Enterprise Linux 9
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Nov 21, 2024A flaw was found in Avahi-daemon, which relies on fixed source ports for wide-area DNS queries.CVE-2024-52615 · Other software · avahi · reported by Red HatMedium 5.3
A flaw was found in Avahi-daemon, which relies on fixed source ports for wide-area DNS queries. This issue simplifies attacks where malicious DNS responses are injected.
Product
avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com access.redhat.com
Nov 2, 2023A vulnerability was found in Avahi.CVE-2023-38473 · Other software · avahi · reported by Red HatMedium 6.2
A vulnerability was found in Avahi. A reachable assertion exists in the avahi_alternative_host_name() function.
Product
avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Nov 2, 2023A vulnerability was found in Avahi.CVE-2023-38472 · Other software · avahi · reported by Red HatMedium 6.2
A vulnerability was found in Avahi. A reachable assertion exists in the avahi_rdata_parse() function.
Product
avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Nov 2, 2023A vulnerability was found in Avahi.CVE-2023-38471 · Other software · avahi · reported by Red HatMedium 6.2
A vulnerability was found in Avahi. A reachable assertion exists in the dbus_set_host_name function.
Product
avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Nov 2, 2023A vulnerability was found in Avahi.CVE-2023-38470 · Other software · avahi · reported by Red HatMedium 6.2
A vulnerability was found in Avahi. A reachable assertion exists in the avahi_escape_label() function.
Product
avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Nov 2, 2023A vulnerability was found in Avahi, where a reachable assertion exists in avahi_dns_packet_append_record.CVE-2023-38469 · Other software · avahi · reported by Red HatMedium 6.2
A vulnerability was found in Avahi, where a reachable assertion exists in avahi_dns_packet_append_record.
Product
avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
May 26, 2023A vulnerability was found in the avahi library.CVE-2023-1981 · Other software · Avahi · reported by Red HatMedium 5.5
A vulnerability was found in the avahi library. This flaw allows an unprivileged user to make a dbus call, causing the avahi daemon to crash.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record access.redhat.com bugzilla.redhat.com
Jun 2, 2021A flaw was found in avahi in versions 0.6 up to 0.8.CVE-2021-3468 · Other software · Avahi · reported by Red HatMedium 5.5
A flaw was found in avahi in versions 0.6 up to 0.8. The event used to signal the termination of the client connection on the avahi Unix socket is not correctly handled in the client_work function, allowing a local attacker to trigger an infinite loop. The highest threat from this vulnerability is to the availability of the avahi service, which becomes unresponsive after this flaw is triggered.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com lists.debian.org
May 7, 2021A flaw was found in avahi 0.8-5.CVE-2021-3502 · Other software · Avahi · reported by Red HatMedium 5.5
A flaw was found in avahi 0.8-5. A reachable assertion is present in avahi_s_host_name_resolver_start function allowing a local attacker to crash the avahi service by requesting hostname resolutions through the avahi socket or dbus methods for invalid hostnames. The highest threat from this vulnerability is to the service availability.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com github.com
Feb 17, 2021avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to caCVE-2021-26720 · Other software · Avahi · reported by MITREHigh 7.8
avahi-daemon-check-dns.sh in the Debian avahi package through 0.8-4 is executed as root via /etc/network/if-up.d/avahi-daemon, and allows a local attacker to cause a denial of service or create arbitrary empty files via a symlink attack on files under /run/avahi-daemon. NOTE: this only affects the packaging for Debian GNU/Linux (used indirectly by SUSE), not the upstream Avahi product.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugs.debian.org bugs.launchpad.net
Apr 30, 2017avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that are not on-link, which allows remote attaCVE-2017-6519 · Other software · Avahi · reported by MITRECritical 9.1
avahi-daemon in Avahi through 0.6.32 and 0.7 inadvertently responds to IPv6 unicast queries with source addresses that are not on-link, which allows remote attackers to cause a denial of service (traffic amplification) and may cause information leakage by obtaining potentially sensitive information from the responding device via port-5353 UDP packets. NOTE: this may overlap CVE-2015-2809.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugzilla.redhat.com github.com
Feb 22, 2011avahi-core/socket.c in avahi-daemon in Avahi before 0.6.29 allows remote attackers to cause a denial of service (infinite loop) via an empty mDNS (1) IPv4 or (2CVE-2011-1002 · Other software · Avahi · reported by Red HatMedium 5
avahi-core/socket.c in avahi-daemon in Avahi before 0.6.29 allows remote attackers to cause a denial of service (infinite loop) via an empty mDNS (1) IPv4 or (2) IPv6 UDP packet to port 5353. NOTE: this vulnerability exists because of an incorrect fix for CVE-2010-2244.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record avahi.org git.0pointer.de
Jul 8, 2010The AvahiDnsPacket function in avahi-core/socket.c in avahi-daemon in Avahi 0.6.16 and 0.6.25 allows remote attackers to cause a denial of service (assertion faCVE-2010-2244 · Other software · Avahi · reported by Red HatMedium 4.3
The AvahiDnsPacket function in avahi-core/socket.c in avahi-daemon in Avahi 0.6.16 and 0.6.25 allows remote attackers to cause a denial of service (assertion failure and daemon exit) via a DNS packet with an invalid checksum followed by a DNS packet with a valid checksum, a different vulnerability than CVE-2008-5081.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record lists.fedoraproject.org lists.fedoraproject.org
Mar 3, 2009The originates_from_local_legacy_unicast_socket function in avahi-core/server.c in avahi-daemon 0.6.23 does not account for the network byte order of a port numCVE-2009-0758 · Other software · Avahi · reported by MITREHigh 7.8
The originates_from_local_legacy_unicast_socket function in avahi-core/server.c in avahi-daemon 0.6.23 does not account for the network byte order of a port number when processing incoming multicast packets, which allows remote attackers to cause a denial of service (network bandwidth and CPU consumption) via a crafted legacy unicast mDNS query packet that triggers a multicast packet storm.
Product
Avahi-daemon
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record bugs.debian.org lists.opensuse.org
Dec 16, 2008The originates_from_local_legacy_unicast_socket function (avahi-core/server.c) in avahi-daemon in Avahi before 0.6.24 allows remote attackers to cause a denial CVE-2008-5081 · Other software · Avahi · reported by Red HatMedium 5
The originates_from_local_legacy_unicast_socket function (avahi-core/server.c) in avahi-daemon in Avahi before 0.6.24 allows remote attackers to cause a denial of service (crash) via a crafted mDNS packet with a source port of 0, which triggers an assertion failure.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record avahi.org lists.opensuse.org
Jun 22, 2007The Avahi daemon in Avahi before 0.6.20 allows attackers to cause a denial of service (exit) via empty TXT data over D-Bus, which triggers an assert error.CVE-2007-3372 · Other software · Avahi · reported by MITRELow 2.1
The Avahi daemon in Avahi before 0.6.20 allows attackers to cause a denial of service (exit) via empty TXT data over D-Bus, which triggers an assert error.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record avahi.org avahi.org
Dec 31, 2006The consume_labels function in avahi-core/dns.c in Avahi before 0.6.16 allows remote attackers to cause a denial of service (infinite loop) via a crafted compreCVE-2006-6870 · Other software · Avahi · reported by security@ubuntu.comMedium 5
The consume_labels function in avahi-core/dns.c in Avahi before 0.6.16 allows remote attackers to cause a denial of service (infinite loop) via a crafted compressed DNS response with a label that points to itself.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record fedoranews.org fedoranews.org
Nov 14, 2006Avahi before 0.6.15 does not verify the sender identity of netlink messages to ensure that they come from the kernel instead of another process, which allows loCVE-2006-5461 · Other software · Avahi · reported by Red HatLow 2.1
Avahi before 0.6.15 does not verify the sender identity of netlink messages to ensure that they come from the kernel instead of another process, which allows local users to spoof network changes to Avahi.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record avahi.org secunia.com
May 9, 2006Buffer overflow in avahi-core in Avahi before 0.6.10 allows local users to execute arbitrary code via unknown vectors.CVE-2006-2289 · Other software · Avahi · reported by MITRELow 2.1
Buffer overflow in avahi-core in Avahi before 0.6.10 allows local users to execute arbitrary code via unknown vectors.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record 0pointer.de secunia.com
May 9, 2006Avahi before 0.6.10 allows local users to cause a denial of service (mDNS/DNS-SD service disconnect) via unspecified mDNS name conflicts.CVE-2006-2288 · Other software · Avahi · reported by MITRELow 3.6
Avahi before 0.6.10 allows local users to cause a denial of service (mDNS/DNS-SD service disconnect) via unspecified mDNS name conflicts.
Product
Avahi
What to do
Apply the vendor’s update. The NVD record links to the advisory.
Full record and what to do →NVD record 0pointer.de secunia.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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