A nss security update has been released for Debian GUN/Linux 10 and 11.

DSA 5016-1: nss security update

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Debian Security Advisory DSA-5016-1 security@debian.org
  https://www.debian.org/security/ Salvatore Bonaccorso
December 01, 2021   https://www.debian.org/security/faq
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Package : nss
CVE ID : CVE-2021-43527

Tavis Ormandy discovered that nss, the Mozilla Network Security Service
library, is prone to a heap overflow flaw when verifying DSA or RSA-PPS
signatures, which could result in denial of service or potentially the
execution of arbitrary code.

For the oldstable distribution (buster), this problem has been fixed
in version 2:3.42.1-1+deb10u4.

For the stable distribution (bullseye), this problem has been fixed in
version 2:3.61-1+deb11u1.

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/