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CVE-2021-45105

Publication date 19 December 2021

Last updated 24 July 2024

Ubuntu priority

Medium

Why this priority?

Cvss 3 Severity Score

5.9 · Medium

Score breakdown

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.

Status

Package Ubuntu Release Status
apache-log4j2 24.04 LTS noble
Not affected
23.10 mantic
Not affected
23.04 lunar
Not affected
22.10 kinetic
Not affected
22.04 LTS jammy
Not affected
21.10 impish
Fixed 2.17.0-0.21.10.1
21.04 hirsute
Fixed 2.17.0-0.21.04.1
20.04 LTS focal
Fixed 2.17.0-0.20.04.1
18.04 LTS bionic
Fixed 2.12.4-0ubuntu0.1
16.04 LTS xenial
Vulnerable

Patch details

For informational purposes only. We recommend not to cherry-pick updates. How can I get the fixes?

Package Patch details
apache-log4j2

Severity score breakdown

Parameter Value
Base score 5.9 · Medium
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

Related Ubuntu Security Notices (USN)

    • USN-5203-1
    • Apache Log4j 2 vulnerability
    • 19 December 2021
    • USN-5222-1
    • Apache Log4j 2 vulnerabilities
    • 11 January 2022

Other references