High severity7.5NVD Advisory· Published Apr 24, 2020· Updated Jun 17, 2026
CVE-2020-6821
CVE-2020-6821
Description
When reading from areas partially or fully outside the source resource with WebGL's copyTexSubImage method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
32<68.7+ 2 more
- (no CPE)range: <68.7
- (no CPE)range: unspecified
- (no CPE)range: unspecified
<68.7.0+ 1 more
- (no CPE)range: <68.7.0
- (no CPE)range: unspecified
- osv-coords27 versionspkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg: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/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
< 128.5.1-1.1+ 26 more
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 68.7.0-lp151.2.42.1
- (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: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-3.84.2
- (no CPE)range: < 68.7.0-78.70.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-109.116.1
- (no CPE)range: < 68.7.0-3.77.1
Patches
Vulnerability mechanics
References
5- usn.ubuntu.com/4335-1/nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2020-12/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2020-13/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2020-14/nvdVendor Advisory
- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions Required
News mentions
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