An openssl security update has been released for Debian GNU/Linux 10 and 11 to address a denial of service issue.

DSA 5103-1: openssl security update

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Debian Security Advisory DSA-5103-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
March 15, 2022   https://www.debian.org/security/faq
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Package : openssl
CVE ID : CVE-2021-4160 CVE-2022-0778
Debian Bug : 989604

Tavis Ormandy discovered that the BN_mod_sqrt() function of OpenSSL
could be tricked into an infinite loop. This could result in denial of
service via malformed certificates.

Additional details can be found in the upstream advisory:
  https://www.openssl.org/news/secadv/20220315.txt

In addition this update corrects a carry propagation bug specific to
MIPS architectures.

For the oldstable distribution (buster), this problem has been fixed
in version 1.1.1d-0+deb10u8.

For the stable distribution (bullseye), this problem has been fixed in
version 1.1.1k-1+deb11u2.

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/