A mumble security update has been released for Debian GNU/Linux 9 LTS to address an exploit that could have been been triggered by a maliciously crafted URL on the server list.

DLA 2562-1: mumble security update

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Debian LTS Advisory DLA-2562-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Chris Lamb
February 18, 2021   https://wiki.debian.org/LTS
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Package : mumble
Version : 1.2.18-1+deb9u2
CVE ID : CVE-2021-27229
Debian Bug : #982904

It was discovered that there was a a remote code execution
vulnerability in mumble, a VoIP client commonly used for group chats.
The exploit could have been been triggered by a maliciously crafted
URL on the server list.

For Debian 9 "Stretch", this problem has been fixed in version
1.2.18-1+deb9u2.

We recommend that you upgrade your mumble packages.

For the detailed security status of mumble please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/mumble

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