CVE-2021-45105

Name	CVE-2021-45105
Description	Apache Log4j2 versions 2.0-alpha1 through 2.16.0 (excluding 2.12.3 and 2.3.1) did not protect from uncontrolled recursion from self-referential lookups. This allows an attacker with control over Thread Context Map data to cause a denial of service when a crafted string is interpreted. This issue was fixed in Log4j 2.17.0, 2.12.3, and 2.3.1.
Source	CVE (at NVD; CERT, LWN, oss-sec, fulldisc, Red Hat, Ubuntu, Gentoo, SUSE bugzilla/CVE, GitHub advisories/code/issues, web search, more)
References	DLA-2852-1, DSA-5024-1
Debian Bugs	1001891

Vulnerable and fixed packages

The table below lists information on source packages.

Source Package	Release	Version	Status
apache-log4j2 (PTS)	buster	2.17.1-1~deb10u1	fixed
	buster (security)	2.17.0-1~deb10u1	fixed
	bullseye	2.17.1-1~deb11u1	fixed
	bullseye (security)	2.17.0-1~deb11u1	fixed
	sid, trixie, bookworm	2.19.0-2	fixed

The information below is based on the following data on fixed versions.

Package	Type	Release	Fixed Version	Origin	Debian Bugs
apache-log4j2	source	stretch	2.12.3-0+deb9u1	DLA-2852-1
apache-log4j2	source	buster	2.17.0-1~deb10u1	DSA-5024-1
apache-log4j2	source	bullseye	2.17.0-1~deb11u1	DSA-5024-1
apache-log4j2	source	(unstable)	2.17.0-1		1001891

https://logging.apache.org/log4j/2.x/security.html#CVE-2021-45105
https://issues.apache.org/jira/browse/LOG4J2-3230