An usbredir security update has been released for Debian GNU/Linux 9 LTS to address a use-after-free vulnerability.

DLA 2958-1: usbredir security update

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Debian LTS Advisory DLA-2958-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
March 21, 2022   https://wiki.debian.org/LTS
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Package : usbredir
Version : 0.7.1-1+deb9u1
CVE ID : CVE-2021-3700

A use-after-free vulnerability was found in Usbredirparser, a parser
for the usbredir protocol, which could result in denial of service or
potentially arbitrary code execution.

For Debian 9 stretch, this problem has been fixed in version
0.7.1-1+deb9u1.

We recommend that you upgrade your usbredir packages.

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

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