High severity8.8NVD Advisory· Published Nov 3, 2021· Updated Jun 17, 2026
CVE-2021-38495
CVE-2021-38495
Description
Mozilla developers reported memory safety bugs present in Thunderbird 78.13.0. 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 < 91.1 and Firefox ESR < 91.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
67<91.1+ 1 more
- (no CPE)range: <91.1
- (no CPE)range: unspecified
<78.13.0+ 1 more
- (no CPE)range: <78.13.0
- (no CPE)range: unspecified
- osv-coords63 versionspkg: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/MozillaThunderbird&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/MozillaThunderbird&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%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
< 91-9.5.1+ 62 more
- (no CPE)range: < 91-9.5.1
- (no CPE)range: < 91.2.0-lp152.2.67.1
- (no CPE)range: < 91.2.0-8.54.1
- (no CPE)range: < 91.4.0-lp152.2.52.1
- (no CPE)range: < 91.4.0-8.45.2
- (no CPE)range: < 91.1.1-1.1
- (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: < 91.1.0-112.71.1
- (no CPE)range: < 91.2.0-3.155.2
- (no CPE)range: < 91.2.0-3.155.2
- (no CPE)range: < 91.2.0-3.155.2
- (no CPE)range: < 91.2.0-3.155.2
- (no CPE)range: < 91.2.0-3.155.2
- (no CPE)range: < 91.2.0-8.54.1
- (no CPE)range: < 91.2.0-8.54.1
- (no CPE)range: < 78.14.0-78.140.4
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.2.0-3.155.2
- (no CPE)range: < 91.2.0-3.155.2
- (no CPE)range: < 91.2.0-3.155.2
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.2.0-3.155.2
- (no CPE)range: < 91.2.0-3.155.2
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.1.0-112.71.1
- (no CPE)range: < 91.4.0-8.45.2
- (no CPE)range: < 91.4.0-8.45.2
Patches
Vulnerability mechanics
References
5- 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/mfsa2021-40/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-41/nvdVendor Advisory
News mentions
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