An apache2 security update has been released for Debian GNU/Linux 10 and 11 to address two vulnerabilities.

DSA 5035-1: apache2 security update

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Debian Security Advisory DSA-5035-1 security@debian.org
  https://www.debian.org/security/ Moritz Muehlenhoff
January 04, 2022   https://www.debian.org/security/faq
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Package : apache2
CVE ID : CVE-2021-44224 CVE-2021-44790

Two vulnerabilities have been discovered in the Apache HTTP server:

CVE-2021-44224

When operating as a forward proxy, Apache was depending on the setup
suspectible to denial of service or Server Side Request forgery.

CVE-2021-44790

A buffer overflow in mod_lua may result in denial of service or
potentially the execution of arbitrary code.

For the oldstable distribution (buster), these problems have been fixed
in version 2.4.38-3+deb10u7.

For the stable distribution (bullseye), these problems have been fixed in
version 2.4.52-1~deb11u2.

We recommend that you upgrade your apache2 packages.

For the detailed security status of apache2 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/apache2

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/