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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

Medium

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)
lunar Not vulnerable
(2.17.0-1)
upstream
Released (2.17.0-1)
mantic Not vulnerable
(2.17.0-1)
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