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A c-ares security update has been released for Debian GNU/Linux 10 LTS to address a buffer overflow vulnerability.

[SECURITY] [DLA 3567-1] c-ares security update

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Debian LTS Advisory DLA-3567-1 Anton Gladky
September 15, 2023
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Package : c-ares
Version : 1.14.0-1+deb10u4
CVE ID : CVE-2020-22217

A vulnerability has been identified in c-ares, an asynchronous name
resolver library:


A buffer overflow vulnerability has been found in c-ares before
via the function ares_parse_soa_reply in ares_parse_soa_reply.c.
This vulnerability was discovered through fuzzing. Exploitation
of this vulnerability may allow an attacker to execute arbitrary
code or cause a denial of service condition.

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

We recommend that you upgrade your c-ares packages.

For the detailed security status of c-ares 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: