High severity8.8NVD Advisory· Published Jun 24, 2021· Updated Jun 17, 2026
CVE-2021-23999
CVE-2021-23999
Description
If a Blob URL was loaded through some unusual user interaction, it could have been loaded by the System Principal and granted additional privileges that should not be granted to web content. 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
43cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <88.0
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*range: <78.10
- (no CPE)range: <78.10
- (no CPE)range: unspecified
- (no CPE)range: unspecified
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <78.10
- (no CPE)range: <78.10
- (no CPE)range: unspecified
- osv-coords35 versionspkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.2pkg: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%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%20SP2
< 78.10.0-lp152.2.55.1+ 34 more
- (no CPE)range: < 78.10.0-lp152.2.55.1
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 78.10.0-lp152.2.41.1
- (no CPE)range: < 91.1.1-1.1
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-3.139.1
- (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: < 78.10.0-8.38.1
- (no CPE)range: < 78.10.0-78.126.1
- (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: < 78.10.0-3.139.1
- (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: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-3.139.1
- (no CPE)range: < 78.10.0-112.57.2
- (no CPE)range: < 78.10.0-3.139.1
- (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: < 78.10.0-8.23.1
Patches
Vulnerability mechanics
References
4- bugzilla.mozilla.org/show_bug.cginvdExploitIssue TrackingVendor 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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