An openssl security update has been released for Debian GNU/Linux 11 to address multiple vulnerabilities.

DSA 5343-1: openssl security update

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Debian Security Advisory DSA-5343-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
February 07, 2023   https://www.debian.org/security/faq
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Package : openssl
CVE ID : CVE-2022-2097 CVE-2022-4304 CVE-2022-4450 CVE-2023-0215
CVE-2023-0286
Debian Bug : 1023424

Multiple vulnerabilities have been discovered in OpenSSL, a Secure
Sockets Layer toolkit, which may result in incomplete encryption, side
channel attacks, denial of service or information disclosure.

Additional details can be found in the upstream advisories at
  https://www.openssl.org/news/secadv/20220705.txt and
  https://www.openssl.org/news/secadv/20230207.txt

For the stable distribution (bullseye), these problems have been fixed in
version 1.1.1n-0+deb11u4.

We recommend that you upgrade your openssl packages.

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

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/