CVE-2023-6212 json
Memory safety bugs present in Firefox 119, Firefox ESR 115.4, and Thunderbird 115.4.
published 2023-11-21 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-58459
- cvss
- 8.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 61%
- public exploits
- 0
- none known
Summary
Memory safety bugs present in Firefox 119, Firefox ESR 115.4, and Thunderbird 115.4. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 120, Firefox ESR < 115.5.0, and Thunderbird < 115.5.
Patch / fix
- Mozilla Firefox 120
- Mozilla Firefox ESR 115.5.0
- Mozilla Thunderbird 115.5
- firefox-esr Debian 12 115.5.0esr-1~deb12u1
- firefox-esr Debian 14, Debian 13 115.5.0esr-1
- thunderbird Debian 12 1:115.5.0-1~deb12u1
- thunderbird Debian 14, Debian 13 1:115.5.0-1
debian advisories DEBIAN-CVE-2023-6212
- firefox Ubuntu 20.04 LTS 120.0+build2-0ubuntu0.20.04.1
- thunderbird Ubuntu 20.04 LTS 1:115.5.0+build1-0ubuntu0.20.04.1
- thunderbird Ubuntu 22.04 LTS 1:115.5.0+build1-0ubuntu0.22.04.1
- thunderbird Ubuntu 24.04 LTS 1:115.5.0+build1-0ubuntu1
ubuntu advisories UBUNTU-CVE-2023-6212
Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
- thunderbird RHEL 9 115.5.0-1.el9_3
- thunderbird RHEL 8 115.5.0-1.el8_9
- firefox RHEL 9 115.5.0-1.el9_3
- firefox-x11 RHEL 9 115.5.0-1.el9_3
- firefox RHEL 7 115.5.0-1.el7_9
- thunderbird RHEL 7 115.5.0-1.el7_9
- firefox RHEL 8 115.5.0-1.el8_9
- thunderbird RHEL 8.1 E4S 115.5.0-1.el8_1
red hat advisories RHSA-2023:7502RHSA-2023:7577RHSA-2023:7570RHSA-2023:7499RHSA-2023:7501RHSA-2023:7574
- MozillaFirefox SLES for SAP 15 SP4, SLES for SAP 15 SP3, SLES for SAP 15 SP2 +14 more 115.6.0-150200.152.120.1
- MozillaFirefox SLES for SAP 12 SP5, SLES 12 SP5, SLE Software Development Kit 12 SP5 115.6.0-112.194.1
- MozillaThunderbird SLE Workstation Extension 15 SP5, SLE Workstation Extension 15 SP4, SLE Module for Package Hub 15 SP5 +3 more 115.5.0-150200.8.139.1
- MozillaFirefox SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 115.6.0-150000.150.119.1
suse advisories SUSE-SU-2023:4929-1SUSE-SU-2023:4928-1SUSE-SU-2023:4912-1SUSE-SU-2023:4588-1
- firefox-esr openSUSE Tumbleweed 128.5.1-1.1
- MozillaThunderbird openSUSE Tumbleweed 115.5.0-1.1
- MozillaFirefox openSUSE Tumbleweed 120.0-1.1
opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:13459-1openSUSE-SU-2024:13468-1
- thunderbird AlmaLinux 8 115.5.0-1.el8_9.alma.1
- thunderbird AlmaLinux 9 115.5.0-1.el9_3.alma
- firefox AlmaLinux 9 115.5.0-1.el9_3.alma.1
- firefox-x11 AlmaLinux 9 115.5.0-1.el9_3.alma.1
- firefox AlmaLinux 8 115.5.0-1.el8_9.alma.1
almalinux advisories ALSA-2023:7500ALSA-2023:7501ALSA-2023:7507ALSA-2023:7508
- thunderbird Rocky Linux 8 115.5.0-1.el8_9
rocky linux advisories RLSA-2023:7500
- firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 115.5.0-r0
- thunderbird Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 115.5.0-r0
alpine advisories ALPINE-CVE-2023-6212
Alpine secdb © Alpine Linux, from https://secdb.alpinelinux.org via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0
Vendor advisories
What the vendors themselves say about their products: affected, fixed or not affected, and what to do.
red hat product security vex CVE-2023-6212 updated cvss 8.8
Mozilla: Memory safety bugs fixed in Firefox 120, Firefox ESR 115.5, and Thunderbird 115.5
-
Red Hat Enterprise Linux 6 firefox, thunderbirdaffected: no fix planned “Out of support scope”
-
Red Hat Enterprise Linux AppStream (v. 8) firefox 115.5.0-1.el8_9, thunderbird 115.5.0-1.el8_9fixed: vendor fix RHSA-2023:7508
-
Red Hat Enterprise Linux AppStream (v. 9) firefox 115.5.0-1.el9_3, firefox-x11 115.5.0-1.el9_3, thunderbird 115.5.0-1.el9_3fixed: vendor fix RHSA-2023:7507
-
Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 115.5.0-1.el8_2, thunderbird 115.5.0-1.el8_2fixed: vendor fix RHSA-2023:7573
-
Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 115.5.0-1.el8_4, thunderbird 115.5.0-1.el8_4fixed: vendor fix RHSA-2023:7569
-
Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 115.5.0-1.el8_1, thunderbird 115.5.0-1.el8_1fixed: vendor fix RHSA-2023:7547
-
Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox 115.5.0-1.el8_2, thunderbird 115.5.0-1.el8_2fixed: vendor fix RHSA-2023:7573
-
Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox 115.5.0-1.el8_4, thunderbird 115.5.0-1.el8_4fixed: vendor fix RHSA-2023:7569
show 7 moreshow fewer
-
Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox 115.5.0-1.el8_6, thunderbird 115.5.0-1.el8_6fixed: vendor fix RHSA-2023:7512
-
Red Hat Enterprise Linux AppStream EUS (v.8.8) firefox 115.5.0-1.el8_8, thunderbird 115.5.0-1.el8_8fixed: vendor fix RHSA-2023:7511
-
Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox 115.5.0-1.el9_0, thunderbird 115.5.0-1.el9_0fixed: vendor fix RHSA-2023:7510
-
Red Hat Enterprise Linux AppStream EUS (v.9.2) firefox 115.5.0-1.el9_2, firefox-x11 115.5.0-1.el9_2, thunderbird 115.5.0-1.el9_2fixed: vendor fix RHSA-2023:7577
-
Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox 115.5.0-1.el8_2, thunderbird 115.5.0-1.el8_2fixed: vendor fix RHSA-2023:7573
-
Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox 115.5.0-1.el8_4, thunderbird 115.5.0-1.el8_4fixed: vendor fix RHSA-2023:7569
-
Red Hat Enterprise Linux Client (v. 7) firefox 115.5.0-1.el7_9, thunderbird 115.5.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 115.5.0-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 115.5.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 115.5.0-1.el7_9, thunderbird 115.5.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 115.5.0-1.el7_9, thunderbird 115.5.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 115.5.0-1.el7_9fixed: vendor fix RHSA-2023:7509
Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 2 y ago
Exploit prediction
0.95% chance of exploitation in the next 30 days, higher than 61% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 8.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H |
Affected products
- Mozilla Firefox
- Mozilla Firefox ESR
- Mozilla Thunderbird
Classification
- Weakness
-
- CWE-787 Out-of-bounds Write
References
-
mozilla.org
/security/advisories/mfsa2023-49/
release-notes, vendor-advisory
-
mozilla.org
/security/advisories/mfsa2023-50/
release-notes, vendor-advisory
-
mozilla.org
/security/advisories/mfsa2023-52/
release-notes, vendor-advisory
-
bugzilla.mozilla.org
/buglist.cgi?bug_id=1658432%2C1820983%2C1829252%2C1856072%2C1856091%2C1859030%2C1860943%2C1862782
broken-link
-
debian.org
/security/2023/dsa-5561
third-party-advisory
-
lists.debian.org
/debian-lts-announce/2023/11/msg00017.html
mailing-list
- lists.debian.org /debian-lts-announce/2023/11/msg00030.html
Sources
- CVE List CVE-2023-6212
- NVD CVE-2023-6212
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.