An apache-log4j2 security update has been released for Debian GNU/Linux 10 and 11.

DSA 5022-1: apache-log4j2 security update

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Debian Security Advisory DSA-5022-1 security@debian.org
  https://www.debian.org/security/ Markus Koschany
December 16, 2021   https://www.debian.org/security/faq
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Package : apache-log4j2
CVE ID : CVE-2021-45046
Debian Bug : 1001729

It was found that the fix to address CVE-2021-44228 in Apache Log4j, a Logging
Framework for Java, was incomplete in certain non-default configurations. This
could allow attackers with control over Thread Context Map (MDC) input data
when the logging configuration uses a non-default Pattern Layout with either a
Context Lookup (for example, $${ctx:loginId}) or a Thread Context Map pattern
(%X, %mdc, or %MDC) to craft malicious input data using a JNDI Lookup pattern
resulting in a denial of service (DOS) attack.

For the oldstable distribution (buster), this problem has been fixed
in version 2.16.0-1~deb10u1.

For the stable distribution (bullseye), this problem has been fixed in
version 2.16.0-1~deb11u1.

We recommend that you upgrade your apache-log4j2 packages.

For the detailed security status of apache-log4j2 please refer to
its security tracker page at:
  https://security-tracker.debian.org/tracker/apache-log4j2

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/