A syslog-ng security update has been released for Debian GNU/Linux 11 to address an integer overflow issue.

DSA 5369-1: syslog-ng security update

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Debian Security Advisory DSA-5369-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
March 05, 2023   https://www.debian.org/security/faq
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Package : syslog-ng
CVE ID : CVE-2022-38725

It was discovered that an integer overflow in the RFC3164 parser of
syslog-ng, a system logging daemon, may result in denial of service
via malformed syslog messages.

For the stable distribution (bullseye), this problem has been fixed in
version 3.28.1-2+deb11u1.

We recommend that you upgrade your syslog-ng packages.

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

Further information about Debian Security Advisories, how to apply
these updates to your system and frequently asked questions can be
found at:   https://www.debian.org/security/