Debian Security Advisory

DLA-2738-1 c-ares -- LTS security update

Date Reported:
10 Aug 2021
Affected Packages:
Security database references:
In Mitre's CVE dictionary: CVE-2021-3672.
More information:

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 1.12.0-1+deb9u2.

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: