High severity8.8NVD Advisory· Published Aug 17, 2021· Updated Jun 17, 2026
CVE-2021-29984
CVE-2021-29984
Description
Instruction reordering resulted in a sequence of instructions that would cause an object to be incorrectly considered during garbage collection. This led to memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.13, Thunderbird < 91, Firefox ESR < 78.13, and Firefox < 91.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
73<78.13+ 2 more
- (no CPE)range: <78.13
- (no CPE)range: unspecified
- (no CPE)range: unspecified
<78.13, <91+ 1 more
- (no CPE)range: <78.13, <91
- (no CPE)range: unspecified
- osv-coords68 versionspkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaFirefox-branding-SLE&distro=openSUSE%20Leap%2015.3pkg: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%2015.3pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/mozjs78&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/rust-cbindgen&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/rust-cbindgen&distro=openSUSE%20Leap%2015.3pkg:rpm/suse/MozillaFirefox-branding-SLED&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-ESPOSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015%20SP1-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP2pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP3pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-BCLpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%2015%20SP1-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP3pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP4pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2015%20SP1pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg: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
< 128.5.1-1.1+ 67 more
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 91-9.5.1
- (no CPE)range: < 78.13.0-lp152.2.64.1
- (no CPE)range: < 78.13.0-8.49.1
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 78.13.0-8.36.1
- (no CPE)range: < 91.1.1-1.1
- (no CPE)range: < 78.13.0-1.2
- (no CPE)range: < 0.19.0-lp152.2.7.1
- (no CPE)range: < 0.19.0-1.9.1
- (no CPE)range: < 91-21.18.1
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 91-4.19.1
- (no CPE)range: < 91-4.19.1
- (no CPE)range: < 91-4.19.1
- (no CPE)range: < 91-4.19.1
- (no CPE)range: < 91-4.19.1
- (no CPE)range: < 91-9.5.1
- (no CPE)range: < 91-9.5.1
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 91-4.19.1
- (no CPE)range: < 91-4.19.1
- (no CPE)range: < 91-4.19.1
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 91-4.19.1
- (no CPE)range: < 91-4.19.1
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 91-35.6.6
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-8.49.1
- (no CPE)range: < 78.13.0-8.49.1
- (no CPE)range: < 78.13.0-78.137.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-3.150.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-112.68.1
- (no CPE)range: < 78.13.0-8.36.1
- (no CPE)range: < 78.13.0-8.36.1
Patches
Vulnerability mechanics
References
7- bugzilla.mozilla.org/show_bug.cginvdExploitIssue TrackingVendor Advisory
- security.gentoo.org/glsa/202202-03nvdThird Party Advisory
- security.gentoo.org/glsa/202208-14nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2021-33/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-34/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-35/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-36/nvdVendor Advisory
News mentions
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