High severity8.8NVD Advisory· Published Jun 24, 2021· Updated Jun 17, 2026
CVE-2021-23995
CVE-2021-23995
Description
When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
43unspecified+ 2 more
- (no CPE)range: unspecified
- (no CPE)range: <78.10
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <78.10
unspecified+ 4 more
- (no CPE)range: unspecified
- (no CPE)range: unspecified
- (no CPE)range: <78.10
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <88.0
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*range: <78.10
- osv-coords35 versionspkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP2pkg:rpm/suse/MozillaFirefox&distro=HPE%20Helion%20OpenStack%208pkg: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%2012%20SP3-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-ESPOSpkg: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%20Server%2012%20SP2-BCLpkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP2pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20High%20Performance%20Computing%2015-LTSSpkg: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/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2015-LTSSpkg: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%20Manager%20Retail%20Branch%20Server%204.0pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Enterprise%20Storage%206pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%209pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%209pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP4-LTSSpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Manager%20Proxy%204.0pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.2pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Manager%20Server%204.0pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweed
< 78.10.0-8.38.1+ 34 more
- (no CPE)range: < 78.10.0-8.38.1
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-8.23.1
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-lp152.2.41.1
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 91.1.1-1.1
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-lp152.2.55.1
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-78.126.1
- (no CPE)range: < 128.5.1-1.1
Patches
Vulnerability mechanics
References
4- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions RequiredVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-14/nvdRelease NotesVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-15/nvdRelease NotesVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-16/nvdRelease NotesVendor Advisory
News mentions
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