CVE-2021-45105

Published: 19 December 2021

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.

Priority

Cvss 3 Severity Score

5.9

Score breakdown

Status

Package	Release	Status
apache-log4j2 Launchpad, Ubuntu, Debian	bionic	Released (2.12.4-0ubuntu0.1)
	focal	Released (2.17.0-0.20.04.1)
	hirsute	Released (2.17.0-0.21.04.1)
	impish	Released (2.17.0-0.21.10.1)
	jammy	Not vulnerable (2.17.0-1)
	kinetic	Not vulnerable (2.17.0-1)
	upstream	Released (2.17.0-1)
	xenial	Needs triage
	Patches: upstream: https://github.com/apache/logging-log4j2/commit/806023265f8c905b2dd1d81fd2458f64b2ea0b5e (2.x) upstream: https://github.com/apache/logging-log4j2/commit/bf7e916df6335713fe2219c7b3b523fb509deabc (2.12.x)

Severity score breakdown

Parameter	Value
Base score	5.9
Attack vector	Network
Attack complexity	High
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality	None
Integrity impact	None
Availability impact	High
Vector	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

References

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