A bind9 security update has been released for Debian GNU/Linux 10 and 11 to address two vulnerabilities that could result in denial of service or cache poisoning.

DSA 5105-1: bind9 security update

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Debian Security Advisory DSA-5105-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
March 18, 2022   https://www.debian.org/security/faq
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Package : bind9
CVE ID : CVE-2021-25220 CVE-2022-0396

Two vulnerabilities were found in the BIND DNS server, which could
result in denial of service or cache poisoning.

For the oldstable distribution (buster), this problem has been fixed
in version 1:9.11.5.P4+dfsg-5.1+deb10u7.

For the stable distribution (bullseye), this problem has been fixed in
version 1:9.16.27-1~deb11u1.

We recommend that you upgrade your bind9 packages.

For the detailed security status of bind9 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/bind9

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/