CVE-2023-6205 json
It was possible to cause the use of a MessagePort after it had already been freed, which could potentially have led to an exploitable crash.
published 2023-11-21 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-58452
- cvss
- 6.5
- 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 59%
- public exploits
- 0
- none known
Summary
It was possible to cause the use of a MessagePort after it had already been freed, which could potentially have led to an exploitable crash. 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-2023-6205
- 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-2023-6205
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-2023-6205
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-2023-6205 updated cvss 7.5
Mozilla: Use-after-free in MessagePort::Entangled
-
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
- partial
- Assessed
- 23 mo ago
Exploit prediction
0.87% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| NVD | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
Affected products
- Mozilla Firefox
- Mozilla Firefox ESR
- Mozilla Thunderbird
Classification
- Weakness
-
- CWE-416 Use After Free
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
/show_bug.cgi?id=1854076
issue-tracking, permissions-required
-
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-2023-6205
- NVD CVE-2023-6205
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.