High severity8.8NVD Advisory· Published Aug 5, 2021· Updated Jun 17, 2026
CVE-2021-29976
CVE-2021-29976
Description
Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird. 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 Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
47cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <90.0
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*range: <78.12
- (no CPE)range: <90
- (no CPE)range: unspecified
- (no CPE)range: unspecified
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <78.12
- (no CPE)range: <78.12
- (no CPE)range: unspecified
- osv-coords39 versionspkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaFirefox&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP2pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP3pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Manager%20Proxy%204.0pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Manager%20Retail%20Branch%20Server%204.0pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Manager%20Server%204.0pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP2pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP3
< 78.12.0-lp152.2.61.1+ 38 more
- (no CPE)range: < 78.12.0-lp152.2.61.1
- (no CPE)range: < 78.12.0-8.46.1
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 78.12.0-lp152.2.48.2
- (no CPE)range: < 78.12.0-8.33.1
- (no CPE)range: < 91.1.1-1.1
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-8.46.1
- (no CPE)range: < 78.12.0-8.46.1
- (no CPE)range: < 78.12.0-78.134.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-3.147.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-112.65.1
- (no CPE)range: < 78.12.0-8.33.1
- (no CPE)range: < 78.12.0-8.33.1
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/mfsa2021-28/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-29/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-30/nvdVendor Advisory
News mentions
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