High severity8.8NVD Advisory· Published Aug 5, 2021· Updated Jun 17, 2026
CVE-2021-29977
CVE-2021-29977
Description
Mozilla developers reported memory safety bugs present in Firefox 89. 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 < 90.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
5<90+ 2 more
- (no CPE)range: <90
- (no CPE)range: unspecified
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <90.0
- osv-coords2 versionspkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweed
< 128.5.1-1.1+ 1 more
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 92.0-1.2
Patches
Vulnerability mechanics
References
3- bugzilla.mozilla.org/buglist.cginvdIssue TrackingVendor Advisory
- security.gentoo.org/glsa/202202-03nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2021-28/nvdVendor Advisory
News mentions
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