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Debian LTS Advisory DLA-2738-1                [email protected]
https://www.debian.org/lts/security/                    Thorsten Alteholz
August 10, 2021                               https://wiki.debian.org/LTS
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Package        : c-ares
Version        : 1.12.0-1+deb9u2
CVE ID         : CVE-2021-3672

An issue has been found in c-ares, an asynchronous name resolver.
Missing input validation of host names returned by Domain Name Servers can 
lead to output of wrong hostnames.

For Debian 9 stretch, 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: https://wiki.debian.org/LTS