CVE-2023-6856

Mozilla Firefox ESR and 5 others: The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems…

CVE-2023-6856 is fixed in 114 products on 2 platforms, first by DEBIAN-CVE-2023-6856, released December 19, 2023. It is not reported as exploited. Patch Radar priority: High.

HighFixed on 2 platforms
CVSS
8.8
high
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.2063
97th percentile

The WebGL `DrawElementsInstanced` method was susceptible to a heap buffer overflow when used on systems with the Mesa VM driver. This issue could allow an attacker to perform remote code execution and sandbox escape. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

Where it's fixed

ProductFixed inFixReleased
Windows apps
Mozilla Firefox (en-US) 121.0 Mozilla Firefox (en-US) 121.0 Dec 20, 2023
Mozilla Firefox ESR (ach) 128.3.0 Mozilla Firefox ESR (ach) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (af) 128.3.0 Mozilla Firefox ESR (af) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (an) 128.3.0 Mozilla Firefox ESR (an) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ar) 128.3.0 Mozilla Firefox ESR (ar) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ast) 128.3.0 Mozilla Firefox ESR (ast) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (az) 128.3.0 Mozilla Firefox ESR (az) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (be) 128.3.0 Mozilla Firefox ESR (be) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (bg) 128.3.0 Mozilla Firefox ESR (bg) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (bn) 128.3.0 Mozilla Firefox ESR (bn) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (br) 128.3.0 Mozilla Firefox ESR (br) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (bs) 128.3.0 Mozilla Firefox ESR (bs) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ca) 128.3.0 Mozilla Firefox ESR (ca) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ca-valencia) 128.3.0 Mozilla Firefox ESR (ca-valencia) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (cak) 128.3.0 Mozilla Firefox ESR (cak) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (cs) 128.3.0 Mozilla Firefox ESR (cs) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (cy) 128.3.0 Mozilla Firefox ESR (cy) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (da) 128.3.0 Mozilla Firefox ESR (da) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (de) 128.3.0 Mozilla Firefox ESR (de) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (dsb) 128.3.0 Mozilla Firefox ESR (dsb) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (el) 128.3.0 Mozilla Firefox ESR (el) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (en-CA) 128.3.0 Mozilla Firefox ESR (en-CA) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (en-GB) 128.3.0 Mozilla Firefox ESR (en-GB) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (en-US) 128.3.0 Mozilla Firefox ESR (en-US) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (eo) 128.3.0 Mozilla Firefox ESR (eo) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (es-AR) 128.3.0 Mozilla Firefox ESR (es-AR) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (es-CL) 128.3.0 Mozilla Firefox ESR (es-CL) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (es-ES) 128.3.0 Mozilla Firefox ESR (es-ES) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (es-MX) 128.3.0 Mozilla Firefox ESR (es-MX) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (et) 128.3.0 Mozilla Firefox ESR (et) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (eu) 128.3.0 Mozilla Firefox ESR (eu) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (fa) 128.3.0 Mozilla Firefox ESR (fa) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ff) 128.3.0 Mozilla Firefox ESR (ff) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (fi) 128.3.0 Mozilla Firefox ESR (fi) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (fr) 128.3.0 Mozilla Firefox ESR (fr) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (fur) 128.3.0 Mozilla Firefox ESR (fur) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (fy-NL) 128.3.0 Mozilla Firefox ESR (fy-NL) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ga-IE) 128.3.0 Mozilla Firefox ESR (ga-IE) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (gd) 128.3.0 Mozilla Firefox ESR (gd) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (gl) 128.3.0 Mozilla Firefox ESR (gl) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (gn) 128.3.0 Mozilla Firefox ESR (gn) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (gu-IN) 128.3.0 Mozilla Firefox ESR (gu-IN) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (he) 128.3.0 Mozilla Firefox ESR (he) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (hi-IN) 128.3.0 Mozilla Firefox ESR (hi-IN) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (hr) 128.3.0 Mozilla Firefox ESR (hr) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (hsb) 128.3.0 Mozilla Firefox ESR (hsb) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (hu) 128.3.0 Mozilla Firefox ESR (hu) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (hy-AM) 128.3.0 Mozilla Firefox ESR (hy-AM) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ia) 128.3.0 Mozilla Firefox ESR (ia) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (id) 128.3.0 Mozilla Firefox ESR (id) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (is) 128.3.0 Mozilla Firefox ESR (is) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (it) 128.3.0 Mozilla Firefox ESR (it) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ja) 128.3.0 Mozilla Firefox ESR (ja) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ka) 128.3.0 Mozilla Firefox ESR (ka) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (kab) 128.3.0 Mozilla Firefox ESR (kab) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (kk) 128.3.0 Mozilla Firefox ESR (kk) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (km) 128.3.0 Mozilla Firefox ESR (km) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (kn) 128.3.0 Mozilla Firefox ESR (kn) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ko) 128.3.0 Mozilla Firefox ESR (ko) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (lij) 128.3.0 Mozilla Firefox ESR (lij) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (lt) 128.3.0 Mozilla Firefox ESR (lt) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (lv) 128.3.0 Mozilla Firefox ESR (lv) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (mk) 128.3.0 Mozilla Firefox ESR (mk) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (mr) 128.3.0 Mozilla Firefox ESR (mr) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ms) 128.3.0 Mozilla Firefox ESR (ms) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (my) 128.3.0 Mozilla Firefox ESR (my) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (nb-NO) 128.3.0 Mozilla Firefox ESR (nb-NO) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ne-NP) 128.3.0 Mozilla Firefox ESR (ne-NP) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (nl) 128.3.0 Mozilla Firefox ESR (nl) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (nn-NO) 128.3.0 Mozilla Firefox ESR (nn-NO) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (oc) 128.3.0 Mozilla Firefox ESR (oc) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (pa-IN) 128.3.0 Mozilla Firefox ESR (pa-IN) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (pl) 128.3.0 Mozilla Firefox ESR (pl) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (pt-BR) 128.3.0 Mozilla Firefox ESR (pt-BR) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (pt-PT) 128.3.0 Mozilla Firefox ESR (pt-PT) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (rm) 128.3.0 Mozilla Firefox ESR (rm) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ro) 128.3.0 Mozilla Firefox ESR (ro) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ru) 128.3.0 Mozilla Firefox ESR (ru) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sc) 128.3.0 Mozilla Firefox ESR (sc) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sco) 128.3.0 Mozilla Firefox ESR (sco) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (si) 128.3.0 Mozilla Firefox ESR (si) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sk) 128.3.0 Mozilla Firefox ESR (sk) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sl) 128.3.0 Mozilla Firefox ESR (sl) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (son) 128.3.0 Mozilla Firefox ESR (son) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sq) 128.3.0 Mozilla Firefox ESR (sq) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sr) 128.3.0 Mozilla Firefox ESR (sr) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (sv-SE) 128.3.0 Mozilla Firefox ESR (sv-SE) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (szl) 128.3.0 Mozilla Firefox ESR (szl) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ta) 128.3.0 Mozilla Firefox ESR (ta) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (te) 128.3.0 Mozilla Firefox ESR (te) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (tg) 128.3.0 Mozilla Firefox ESR (tg) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (th) 128.3.0 Mozilla Firefox ESR (th) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (tl) 128.3.0 Mozilla Firefox ESR (tl) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (tr) 128.3.0 Mozilla Firefox ESR (tr) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (trs) 128.3.0 Mozilla Firefox ESR (trs) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (uk) 128.3.0 Mozilla Firefox ESR (uk) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (ur) 128.3.0 Mozilla Firefox ESR (ur) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (uz) 128.3.0 Mozilla Firefox ESR (uz) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (vi) 128.3.0 Mozilla Firefox ESR (vi) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (xh) 128.3.0 Mozilla Firefox ESR (xh) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (zh-CN) 128.3.0 Mozilla Firefox ESR (zh-CN) 128.3.0 Oct 1, 2024
Mozilla Firefox ESR (zh-TW) 128.3.0 Mozilla Firefox ESR (zh-TW) 128.3.0 Oct 1, 2024
Mozilla Thunderbird (en-US) 115.8.0 Mozilla Thunderbird (en-US) 115.8.0 Feb 21, 2024
Linux
firefox · RHEL 8 0:115.6.0-1.el8_9 RHSA-2024:0012 Jan 2, 2024
firefox · RHEL 9 0:115.6.0-1.el9_3 RHSA-2024:0025 Jan 2, 2024
firefox · Ubuntu 20.04 LTS (focal) 121.0+build1-0ubuntu0.20.04.1 firefox 121.0+build1-0ubuntu0.20.04.1 Dec 19, 2023
firefox · almalinux 8 115.6.0-1.el8_9.alma ALSA-2024:0012 Jan 2, 2024
firefox · almalinux 9 115.6.0-1.el9_3.alma ALSA-2024:0025 Jan 2, 2024
firefox · ol 8 0:115.6.0-1.0.1.el8_9 ELSA-2024-0012 Jan 3, 2024
firefox · ol 9 0:115.6.0-1.0.1.el9_3 ELSA-2024-0025 Jan 3, 2024
firefox · rocky 8 0:115.6.0-1.el8_9 RLSA-2024:0012 Jan 9, 2024
firefox-esr · Debian 11.6 (bullseye) 115.6.0esr-1~deb11u1 DSA-5581-1 Dec 20, 2023
firefox-esr · Debian 12.15 (bookworm) 115.6.0esr-1~deb12u1 DSA-5581-1 Dec 20, 2023
firefox-esr · Debian 13.5 (trixie) 115.6.0esr-1 DEBIAN-CVE-2023-6856 Dec 19, 2023
firefox-esr · Debian 14 115.6.0esr-1 DEBIAN-CVE-2023-6856 Dec 19, 2023
firefox-geckodriver · Ubuntu 20.04 LTS (focal) 121.0+build1-0ubuntu0.20.04.1 firefox-geckodriver 121.0+build1-0ubuntu0.20.04.1 Dec 19, 2023
firefox-mozsymbols · Ubuntu 20.04 LTS (focal) 121.0+build1-0ubuntu0.20.04.1 firefox-mozsymbols 121.0+build1-0ubuntu0.20.04.1 Dec 19, 2023
firefox-x11 · RHEL 9 0:115.6.0-1.el9_3 RHSA-2024:0025 Jan 2, 2024
firefox-x11 · almalinux 9 115.6.0-1.el9_3.alma ALSA-2024:0025 Jan 2, 2024
firefox-x11 · ol 9 0:115.6.0-1.0.1.el9_3 ELSA-2024-0025 Jan 3, 2024
thunderbird · Debian 12.15 (bookworm) 1:115.6.0-1~deb12u1 DEBIAN-CVE-2023-6856 Dec 19, 2023
thunderbird · Debian 13.5 (trixie) 1:115.6.0-1 DEBIAN-CVE-2023-6856 Dec 19, 2023
thunderbird · Debian 14 1:115.6.0-1 DEBIAN-CVE-2023-6856 Dec 19, 2023
thunderbird · RHEL 8 0:115.6.0-1.el8_9 RHSA-2024:0003 Jan 2, 2024
thunderbird · RHEL 9 0:115.6.0-1.el9_3 RHSA-2024:0001 Jan 2, 2024
thunderbird · Ubuntu 20.04 LTS (focal) 1:115.6.0+build2-0ubuntu0.20.04.1 thunderbird 1:115.6.0+build2-0ubuntu0.20.04.1 Dec 19, 2023
thunderbird · Ubuntu 22.04.1 LTS (jammy) 1:115.6.0+build2-0ubuntu0.22.04.1 thunderbird 1:115.6.0+build2-0ubuntu0.22.04.1 Dec 19, 2023
thunderbird · Ubuntu 24.04.5 LTS (noble) 1:115.6.0+build2-0ubuntu1 thunderbird 1:115.6.0+build2-0ubuntu1 Dec 19, 2023
thunderbird · almalinux 8 115.6.0-1.el8_9.alma ALSA-2024:0003 Jan 2, 2024
thunderbird · almalinux 9 115.6.0-1.el9_3.alma ALSA-2024:0001 Jan 2, 2024
thunderbird · ol 8 0:115.6.0-1.0.1.el8_9 ELSA-2024-0003 Jan 3, 2024
thunderbird · ol 9 0:115.6.0-1.0.1.el9_3 ELSA-2024-0001 Jan 3, 2024
thunderbird · rocky 8 0:115.6.0-1.el8_9 RLSA-2024:0003 Jan 9, 2024
thunderbird-gnome-support · Ubuntu 20.04 LTS (focal) 1:115.6.0+build2-0ubuntu0.20.04.1 thunderbird-gnome-support 1:115.6.0+build2-0ubuntu0.20.04.1 Dec 19, 2023
thunderbird-gnome-support · Ubuntu 22.04.1 LTS (jammy) 1:115.6.0+build2-0ubuntu0.22.04.1 thunderbird-gnome-support 1:115.6.0+build2-0ubuntu0.22.04.1 Dec 19, 2023
thunderbird-gnome-support · Ubuntu 24.04.5 LTS (noble) 1:115.6.0+build2-0ubuntu1 thunderbird-gnome-support 1:115.6.0+build2-0ubuntu1 Dec 19, 2023
thunderbird-mozsymbols · Ubuntu 20.04 LTS (focal) 1:115.6.0+build2-0ubuntu0.20.04.1 thunderbird-mozsymbols 1:115.6.0+build2-0ubuntu0.20.04.1 Dec 19, 2023
thunderbird-mozsymbols · Ubuntu 22.04.1 LTS (jammy) 1:115.6.0+build2-0ubuntu0.22.04.1 thunderbird-mozsymbols 1:115.6.0+build2-0ubuntu0.22.04.1 Dec 19, 2023
thunderbird-mozsymbols · Ubuntu 24.04.5 LTS (noble) 1:115.6.0+build2-0ubuntu1 thunderbird-mozsymbols 1:115.6.0+build2-0ubuntu1 Dec 19, 2023
xul-ext-calendar-timezones · Ubuntu 20.04 LTS (focal) 1:115.6.0+build2-0ubuntu0.20.04.1 xul-ext-calendar-timezones 1:115.6.0+build2-0ubuntu0.20.04.1 Dec 19, 2023
xul-ext-calendar-timezones · Ubuntu 22.04.1 LTS (jammy) 1:115.6.0+build2-0ubuntu0.22.04.1 xul-ext-calendar-timezones 1:115.6.0+build2-0ubuntu0.22.04.1 Dec 19, 2023
xul-ext-calendar-timezones · Ubuntu 24.04.5 LTS (noble) 1:115.6.0+build2-0ubuntu1 xul-ext-calendar-timezones 1:115.6.0+build2-0ubuntu1 Dec 19, 2023
xul-ext-gdata-provider · Ubuntu 20.04 LTS (focal) 1:115.6.0+build2-0ubuntu0.20.04.1 xul-ext-gdata-provider 1:115.6.0+build2-0ubuntu0.20.04.1 Dec 19, 2023
xul-ext-gdata-provider · Ubuntu 22.04.1 LTS (jammy) 1:115.6.0+build2-0ubuntu0.22.04.1 xul-ext-gdata-provider 1:115.6.0+build2-0ubuntu0.22.04.1 Dec 19, 2023
xul-ext-gdata-provider · Ubuntu 24.04.5 LTS (noble) 1:115.6.0+build2-0ubuntu1 xul-ext-gdata-provider 1:115.6.0+build2-0ubuntu1 Dec 19, 2023
xul-ext-lightning · Ubuntu 20.04 LTS (focal) 1:115.6.0+build2-0ubuntu0.20.04.1 xul-ext-lightning 1:115.6.0+build2-0ubuntu0.20.04.1 Dec 19, 2023
xul-ext-lightning · Ubuntu 22.04.1 LTS (jammy) 1:115.6.0+build2-0ubuntu0.22.04.1 xul-ext-lightning 1:115.6.0+build2-0ubuntu0.22.04.1 Dec 19, 2023
xul-ext-lightning · Ubuntu 24.04.5 LTS (noble) 1:115.6.0+build2-0ubuntu1 xul-ext-lightning 1:115.6.0+build2-0ubuntu1 Dec 19, 2023

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