Critical severity9.8NVD Advisory· Published Dec 22, 2022· Updated Jun 17, 2026
CVE-2021-4129
CVE-2021-4129
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.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
5<95+ 2 more
- (no CPE)range: <95
- (no CPE)range: unspecified
- (no CPE)range: unspecified
<91.4.0+ 1 more
- (no CPE)range: <91.4.0
- (no CPE)range: unspecified
Patches
Vulnerability mechanics
References
4- bugzilla.mozilla.org/buglist.cginvdExploitIssue TrackingVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-52/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-53/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-54/nvdVendor Advisory
News mentions
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