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An avahi security update has been released for Debian GNU/Linux 10 LTS to address a deny of service issue.

[SECURITY] [DLA 3466-1] avahi security update

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Debian LTS Advisory DLA-3466-1 Bastien Roucariès
June 21, 2023
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Package : avahi
Version : 0.7-4+deb10u3
CVE ID : CVE-2021-3468
Debian Bug : 984938

Avahi a free zero-configuration networking (zeroconf) implementation,
including a system for multicast DNS/DNS-SD service discovery, was
affected by a Deny of Service. 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.

For Debian 10 buster, this problem has been fixed in version

We recommend that you upgrade your avahi packages.

For the detailed security status of avahi please refer to
its security tracker page at:

Further information about Debian LTS security advisories, how to apply
these updates to your system and frequently asked questions can be
found at: