High severity8.1NVD Advisory· Published May 26, 2020· Updated Jun 17, 2026
CVE-2020-12387
CVE-2020-12387
Description
A race condition when running shutdown code for Web Worker led to a use-after-free vulnerability. This resulted in a potentially exploitable crash. This vulnerability affects Firefox ESR < 68.8, Firefox < 76, and Thunderbird < 68.8.0.
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: <76.0
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*range: <68.8.0
- (no CPE)range: <68.8
- (no CPE)range: unspecified
- (no CPE)range: unspecified
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*+ 2 more
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <68.8.0
- (no CPE)range: <68.8.0
- (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
< 68.8.0-lp151.2.45.1+ 26 more
- (no CPE)range: < 68.8.0-lp151.2.45.1
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 68.8.0-lp151.2.38.2
- (no CPE)range: < 91.1.1-1.1
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-3.87.1
- (no CPE)range: < 68.8.0-78.73.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-109.119.1
- (no CPE)range: < 68.8.0-3.80.2
Patches
Vulnerability mechanics
References
7- security.gentoo.org/glsa/202005-03nvdThird Party Advisory
- security.gentoo.org/glsa/202005-04nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2020-16/nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2020-17/nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2020-18/nvdThird Party Advisory
- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions Required
- usn.ubuntu.com/4373-1/nvdBroken Link
News mentions
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