High severity8.8NVD Advisory· Published Nov 3, 2021· Updated Jun 17, 2026
CVE-2021-38493
CVE-2021-38493
Description
Mozilla developers reported memory safety bugs present in Firefox 91 and Firefox ESR 78.13. 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 ESR < 78.14, Thunderbird < 78.14, and Firefox < 92.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
14cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <92.0
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*range: <78.14
- (no CPE)range: <78.14
- (no CPE)range: unspecified
- (no CPE)range: unspecified
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <78.14
- (no CPE)range: <78.14
- (no CPE)range: unspecified
- osv-coords6 versionspkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP2pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP3
< 92.0-1.2+ 5 more
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 91.4.0-lp152.2.52.1
- (no CPE)range: < 91.4.0-8.45.2
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 91.4.0-8.45.2
- (no CPE)range: < 91.4.0-8.45.2
Patches
Vulnerability mechanics
References
6- bugzilla.mozilla.org/buglist.cginvdVendor Advisory
- security.gentoo.org/glsa/202202-03nvdThird Party Advisory
- security.gentoo.org/glsa/202208-14nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2021-38/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-39/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-42/nvdVendor Advisory
News mentions
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