CVE-2021-3468

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2021-06-02 · updated 2026-06-17
Weakness: CWE-835

Description

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.

Affected products

avahi: from 0.6 through 0.8
Debian Linux: 9.0

References

https://bugzilla.redhat.com/show_bug.cgi?id=1939614
https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html
https://lists.debian.org/debian-lts-announce/2023/06/msg00028.html
https://bugzilla.redhat.com/show_bug.cgi?id=1939614
https://lists.debian.org/debian-lts-announce/2022/06/msg00009.html
https://lists.debian.org/debian-lts-announce/2023/06/msg00028.html

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