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

DSA 5062-1: nss security update

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Debian Security Advisory DSA-5062-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
January 25, 2022   https://www.debian.org/security/faq
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Package : nss
CVE ID : CVE-2022-22747

Tavis Ormandy discovered that incorrect parsing of pkcs7 sequences in
nss, the Mozilla Network Security Service library, may result in denial
of service.

For the oldstable distribution (buster), this problem has been fixed
in version 2:3.42.1-1+deb10u5.

For the stable distribution (bullseye), this problem has been fixed in
version 2:3.61-1+deb11u2.

We recommend that you upgrade your nss packages.

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

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/