Medium severity6.5NVD Advisory· Published Jun 24, 2021· Updated Jun 17, 2026
CVE-2021-29951
CVE-2021-29951
Description
The Mozilla Maintenance Service granted SERVICE_START access to BUILTIN|Users which, in a domain network, grants normal remote users access to start or stop the service. This could be used to prevent the browser update service from operating (if an attacker spammed the 'Stop' command); but also exposed attack surface in the maintenance service. *Note: This issue only affected Windows operating systems older than Win 10 build 1709. Other operating systems are unaffected.*. This vulnerability affects Thunderbird < 78.10.1, Firefox < 87, and Firefox ESR < 78.10.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
40<87+ 2 more
- (no CPE)range: <87
- (no CPE)range: unspecified
- (no CPE)range: unspecified
<78.10.1+ 1 more
- (no CPE)range: <78.10.1
- (no CPE)range: unspecified
- osv-coords35 versionspkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.3pkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.3pkg: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
< 78.11.0-lp152.2.58.1+ 34 more
- (no CPE)range: < 78.11.0-lp152.2.58.1
- (no CPE)range: < 78.11.0-8.43.1
- (no CPE)range: < 78.10.2-8.27.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-8.43.1
- (no CPE)range: < 78.11.0-8.43.1
- (no CPE)range: < 78.11.0-78.131.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-3.144.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.11.0-112.62.1
- (no CPE)range: < 78.10.2-8.27.1
- (no CPE)range: < 78.10.2-8.27.1
Patches
Vulnerability mechanics
References
4- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-10/nvdRelease NotesVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-18/nvdRelease NotesVendor Advisory
- www.mozilla.org/security/advisories/mfsa2021-19/nvdRelease NotesVendor Advisory
News mentions
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