High severity8.8NVD Advisory· Published Aug 10, 2020· Updated Jun 17, 2026
CVE-2020-15656
CVE-2020-15656
Description
JIT optimizations involving the Javascript arguments object could confuse later optimizations. This risk was already mitigated by various precautions in the code, resulting in this bug rated at only moderate severity. This vulnerability affects Firefox ESR < 78.1, Firefox < 79, and Thunderbird < 78.1.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
40unspecified+ 4 more
- (no CPE)range: unspecified
- (no CPE)range: unspecified
- cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:*range: <79.0
- cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:*range: <78.1
- (no CPE)range: <78.1
unspecified+ 2 more
- (no CPE)range: unspecified
- cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*range: <78.1
- (no CPE)range: <78.1
- osv-coords28 versionspkg:rpm/opensuse/pipewire&distro=openSUSE%20Leap%2015.2pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.1pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Tumbleweedpkg:rpm/opensuse/firefox-esr&distro=openSUSE%20Tumbleweedpkg:rpm/suse/MozillaFirefox&distro=HPE%20Helion%20OpenStack%208pkg:rpm/suse/MozillaFirefox&distro=SUSE%20OpenStack%20Cloud%207pkg: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/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%20Software%20Development%20Kit%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP2-BCLpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-LTSSpkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Server%2012%20SP3-BCLpkg: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%20for%20SAP%20Applications%2012%20SP5pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Enterprise%20Storage%205pkg:rpm/suse/MozillaFirefox&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP2pkg:rpm/suse/pipewire&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%20Module%20for%20Desktop%20Applications%2015%20SP1pkg:rpm/suse/MozillaFirefox-branding-SLE&distro=SUSE%20Linux%20Enterprise%20Module%20for%20Desktop%20Applications%2015%20SP2pkg:rpm/opensuse/MozillaFirefox&distro=openSUSE%20Leap%2015.2
< 0.3.6-lp152.2.3.1+ 27 more
- (no CPE)range: < 0.3.6-lp152.2.3.1
- (no CPE)range: < 78.1.0-lp151.2.61.1
- (no CPE)range: < 92.0-1.2
- (no CPE)range: < 128.5.1-1.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-112.8.1
- (no CPE)range: < 78.1.0-8.3.1
- (no CPE)range: < 0.3.6-3.3.2
- (no CPE)range: < 78.1.0-78.87.1
- (no CPE)range: < 78.1.0-3.100.2
- (no CPE)range: < 78-9.2.4
- (no CPE)range: < 78.1.0-lp152.2.12.1
cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*+ 2 more
- cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:esm:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
- cpe:2.3:o:canonical:ubuntu_linux:20.04:*:*:*:lts:*:*:*
Patches
Vulnerability mechanics
References
6- lists.opensuse.org/opensuse-security-announce/2020-08/msg00025.htmlnvdThird Party Advisory
- bugzilla.mozilla.org/show_bug.cginvdIssue TrackingPermissions RequiredVendor Advisory
- usn.ubuntu.com/4443-1/nvdThird Party Advisory
- www.mozilla.org/security/advisories/mfsa2020-30/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2020-32/nvdVendor Advisory
- www.mozilla.org/security/advisories/mfsa2020-33/nvdVendor Advisory
News mentions
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