High severity8.8NVD Advisory· Published Dec 8, 2021· Updated Jun 17, 2026
CVE-2021-43534
CVE-2021-43534
Description
Mozilla developers and community members reported memory safety bugs present in Firefox 93 and Firefox ESR 91.2. 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 < 94, Thunderbird < 91.3, and Firefox ESR < 91.3.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
5<94+ 2 more
- (no CPE)range: <94
- (no CPE)range: unspecified
- (no CPE)range: unspecified
<91.3+ 1 more
- (no CPE)range: <91.3
- (no CPE)range: unspecified
Patches
Vulnerability mechanics
References
8- bugzilla.mozilla.org/buglist.cginvdBroken LinkIssue TrackingVendor Advisory
- lists.debian.org/debian-lts-announce/2021/12/msg00030.htmlnvdMailing ListThird Party Advisory
- lists.debian.org/debian-lts-announce/2022/01/msg00001.htmlnvdMailing ListThird Party Advisory
- www.debian.org/security/2021/dsa-5026nvdThird Party Advisory
- www.debian.org/security/2022/dsa-5034nvdIssue TrackingThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2021-48/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-49/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-50/nvdVendor Advisory
News mentions
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