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.
History

Wed, 16 Apr 2025 16:15:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'total'}, 'version': '2.0.3'}


cve-icon MITRE

Status: PUBLISHED

Assigner: mozilla

Published:

Updated: 2025-04-16T15:56:28.819Z

Reserved: 2021-12-16T00:00:00.000Z

Link: CVE-2021-4129

cve-icon Vulnrichment

Updated: 2024-08-03T17:16:04.245Z

cve-icon NVD

Status : Modified

Published: 2022-12-22T20:15:12.133

Modified: 2025-04-16T16:15:18.957

Link: CVE-2021-4129

cve-icon Redhat

Severity : Important

Publid Date: 2021-12-07T00:00:00Z

Links: CVE-2021-4129 - Bugzilla