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

DLA 2683-1: rxvt security update

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Debian LTS Advisory DLA-2683-1 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 : rxvt
Version : 1:2.7.10-7+deb9u2
CVE ID : CVE-2017-7483 CVE-2021-33477
Debian Bug : 861694

rxvt, VT102 terminal emulator for the X Window System, 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
1:2.7.10-7+deb9u2.

We recommend that you upgrade your rxvt packages.

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

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