An ircii security update has been released for Debian GNU/Linux 9 LTS to address an issue where a crafted CTCP UTC message could allow an attacker to disconnect the victim from an IRC server due to a segmentation fault and client crash.

DLA 2747-1: ircii security update

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Debian LTS Advisory DLA-2747-1 debian-lts@lists.debian.org
  https://www.debian.org/lts/security/ Thorsten Alteholz
August 22, 2021   https://wiki.debian.org/LTS
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Package : ircii
Version : 20151120-1+deb9u1
CVE ID : CVE-2021-29376

An issue has been found in ircii, an Internet Relay Chat client.
A crafted CTCP UTC message could allow an attacker to disconnect the
victim from an IRC server due to a segmentation fault and client crash.

For Debian 9 stretch, this problem has been fixed in version
20151120-1+deb9u1.

We recommend that you upgrade your ircii packages.

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

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