CVE-2021-4129

Publication date 21 January 2022

Last updated 25 August 2025

Ubuntu priority

Cvss 3 Severity Score

Description

Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Firefox 94. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 95, Firefox ESR < 91.4.0, and Thunderbird < 91.4.0.

Status

Show unmaintained releases

Package	Ubuntu Release	Status
thunderbird	23.04 lunar	Fixed 1:91.4.0+build1-0ubuntu1
	22.10 kinetic	Fixed 1:91.4.0+build1-0ubuntu1
	22.04 LTS jammy	Fixed 1:91.4.0+build1-0ubuntu1
	21.10 impish	Fixed 1:91.5.0+build1-0ubuntu0.21.10.1
	21.04 hirsute	Ignored end of life
	20.04 LTS focal	Fixed 1:91.5.0+build1-0ubuntu0.20.04.1
	18.04 LTS bionic	Fixed 1:91.5.0+build1-0ubuntu0.18.04.1

Severity score breakdown

CVSS version: CVSS v3.0

Base score 9.8 · Critical

Base metrics

Parameter	Value
Attack vector	Network
Attack complexity	Low
Privileges required	None
User interaction	None
Scope	Unchanged
Confidentiality impact	High
Integrity impact	High
Availability impact	High

Scores

Parameter	Value
Base score	9.8 · Critical
Exploitability score	-
Impact score	-

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Related Ubuntu Security Notices (USN)

USN-5246-1
Thunderbird vulnerabilities
21 January 2022

USN-5248-1
Thunderbird vulnerabilities
21 January 2022