High severity8.1CISA KEVNVD Advisory· Published Apr 24, 2020· Updated Jun 17, 2026
CVE-2020-6819
CVE-2020-6819
Description
Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
35cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*+ 4 more
- cpe:2.3:a:mozilla:firefox:*:*:*:*:-:*:*:*range: <74.0.1
- cpe:2.3:a:mozilla:firefox:*:*:*:*:esr:*:*:*range: <68.6.1
- (no CPE)range: <74.0.1
- (no CPE)range: unspecified
- (no CPE)range: unspecified
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <68.7.0
- (no CPE)range: <68.7.0
- (no CPE)range: unspecified
- osv-coords27 versionspkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.1pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/MozillaThunderbird&distro=openSUSE%20Leap%2015.1pkg: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%205pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP1pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2011%20SP4-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP1-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSSpkg: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%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP1pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%20for%20SAP%20Applications%2012%20SP2pkg: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%20Software%20Development%20Kit%2012%20SP4pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%207pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%20Crowbar%208pkg:rpm/suse/MozillaThunderbird&distro=SUSE%20Linux%20Enterprise%20Workstation%20Extension%2015%20SP1
< 68.6.1-lp151.2.39.1+ 26 more
- (no CPE)range: < 68.6.1-lp151.2.39.1
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 68.7.0-lp151.2.31.1
- (no CPE)range: < 91.1.1-1.1
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-3.81.1
- (no CPE)range: < 68.6.1-78.67.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.6.1-109.113.1
- (no CPE)range: < 68.7.0-3.77.1
Patches
Vulnerability mechanics
References
5- bugzilla.mozilla.org/show_bug.cginvdExploitIssue Tracking
- usn.ubuntu.com/4335-1/nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2020-11/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2020-14/nvdVendor Advisory
- www.cisa.gov/known-exploited-vulnerabilities-catalognvdUS Government Resource
News mentions
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