A mrxvt security update has been released for Debian GNU/Linux 9 LTS to address a potentially remote code execution.

DLA 2682-1: mrxvt security update

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Debian LTS Advisory DLA-2682-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Utkarsh Gupta
June 09, 2021   https://wiki.debian.org/LTS
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Package : mrxvt
Version : 0.5.4-2+deb9u1
CVE ID : CVE-2021-33477

mrxvt, lightweight multi-tabbed X terminal emulator, allowed
(potentially remote) code execution because of improper handling
of certain escape sequences (ESC G Q).

For Debian 9 stretch, this problem has been fixed in version
0.5.4-2+deb9u1.

We recommend that you upgrade your mrxvt packages.

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

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