CVE-2023-6859 json
A use-after-free condition affected TLS socket creation when under memory pressure.
published 2023-12-19 2 y ago modified 2026-06-17 4 mo ago also EUVD-2023-59063
- cvss
- 8.8
- version 3.1, NVD
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 1.1%
- EPSS 1.1% chance of exploitation in 30 days, percentile 65%
- public exploits
- 0
- none known
Summary
A use-after-free condition affected TLS socket creation when under memory pressure. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.
Patch / fix
- Mozilla Firefox ESR 115.6
- Mozilla Thunderbird 115.6
- Mozilla Firefox 121
- firefox-esr Debian 12 115.6.0esr-1~deb12u1
- firefox-esr Debian 14, Debian 13 115.6.0esr-1
- thunderbird Debian 12 1:115.6.0-1~deb12u1
- thunderbird Debian 14, Debian 13 1:115.6.0-1
debian advisories DEBIAN-CVE-2023-6859
- firefox Ubuntu 20.04 LTS 121.0+build1-0ubuntu0.20.04.1
- thunderbird Ubuntu 20.04 LTS 1:115.6.0+build2-0ubuntu0.20.04.1
- thunderbird Ubuntu 22.04 LTS 1:115.6.0+build2-0ubuntu0.22.04.1
- thunderbird Ubuntu 24.04 LTS 1:115.6.0+build2-0ubuntu1
ubuntu advisories UBUNTU-CVE-2023-6859
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 8 115.6.0-1.el8_9
- thunderbird RHEL 7 115.6.0-1.el7_9
- thunderbird RHEL 9 115.6.0-1.el9_3
- firefox RHEL 7 115.6.0-1.el7_9
- firefox RHEL 9 115.6.0-1.el9_3
- firefox-x11 RHEL 9 115.6.0-1.el9_3
- firefox RHEL 8 115.6.0-1.el8_9
- thunderbird RHEL 8.4 TUS, RHEL 8.4 E4S, RHEL 8.4 AUS 115.6.0-1.el8_4
red hat advisories RHSA-2024:0003RHSA-2024:0028RHSA-2024:0029RHSA-2024:0030RHSA-2024:0027RHSA-2024:0001
- MozillaThunderbird SLE Workstation Extension 15 SP5, SLE Module for Package Hub 15 SP5, openSUSE Leap 15.5 115.6.0-150200.8.142.2
- 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
- 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-2024:0044-1SUSE-SU-2023:4929-1SUSE-SU-2023:4928-1SUSE-SU-2023:4912-1
- firefox-esr openSUSE Tumbleweed 128.5.1-1.1
- MozillaThunderbird openSUSE Tumbleweed 115.6.0-1.1
- MozillaFirefox openSUSE Tumbleweed 121.0-1.1
opensuse advisories openSUSE-SU-2024:14572-1openSUSE-SU-2024:13519-1openSUSE-SU-2024:13531-1
- thunderbird AlmaLinux 9 115.6.0-1.el9_3.alma
- thunderbird AlmaLinux 8 115.6.0-1.el8_9.alma
- firefox AlmaLinux 8 115.6.0-1.el8_9.alma
- firefox AlmaLinux 9 115.6.0-1.el9_3.alma
- firefox-x11 AlmaLinux 9 115.6.0-1.el9_3.alma
almalinux advisories ALSA-2024:0001ALSA-2024:0003ALSA-2024:0012ALSA-2024:0025
- thunderbird Rocky Linux 8 115.6.0-1.el8_9
- firefox Rocky Linux 8 115.6.0-1.el8_9
rocky linux advisories RLSA-2024:0003RLSA-2024:0012
- firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 115.6.0-r0
alpine advisories ALPINE-CVE-2023-6859
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-2023-6859 updated cvss 8.8
Mozilla: Use-after-free in PR_GetIdentitiesLayer
-
Red Hat Enterprise Linux 6 firefox, thunderbirdaffected: no fix planned “Out of support scope”
-
Red Hat Enterprise Linux AppStream (v. 8) firefox 115.6.0-1.el8_9, thunderbird 115.6.0-1.el8_9fixed: vendor fix RHSA-2024:0012
-
Red Hat Enterprise Linux AppStream (v. 9) firefox 115.6.0-1.el9_3, firefox-x11 115.6.0-1.el9_3, thunderbird 115.6.0-1.el9_3fixed: vendor fix RHSA-2024:0025
-
Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 115.6.0-1.el8_2, thunderbird 115.6.0-1.el8_2fixed: vendor fix RHSA-2024:0023
-
Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 115.6.0-1.el8_4, thunderbird 115.6.0-1.el8_4fixed: vendor fix RHSA-2024:0021
-
Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox 115.6.0-1.el8_2, thunderbird 115.6.0-1.el8_2fixed: vendor fix RHSA-2024:0023
-
Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox 115.6.0-1.el8_4, thunderbird 115.6.0-1.el8_4fixed: vendor fix RHSA-2024:0021
-
Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox 115.6.0-1.el8_6, thunderbird 115.6.0-1.el8_6fixed: vendor fix RHSA-2024:0024
show 6 moreshow fewer
-
Red Hat Enterprise Linux AppStream EUS (v.8.8) firefox 115.6.0-1.el8_8, thunderbird 115.6.0-1.el8_8fixed: vendor fix RHSA-2024:0011
-
Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox 115.6.0-1.el9_0, thunderbird 115.6.0-1.el9_0fixed: vendor fix RHSA-2024:0022
-
Red Hat Enterprise Linux AppStream EUS (v.9.2) firefox 115.6.0-1.el9_2, firefox-x11 115.6.0-1.el9_2, thunderbird 115.6.0-1.el9_2fixed: vendor fix RHSA-2024:0019
-
Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox 115.6.0-1.el8_2, thunderbird 115.6.0-1.el8_2fixed: vendor fix RHSA-2024:0023
-
Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox 115.6.0-1.el8_4, thunderbird 115.6.0-1.el8_4fixed: vendor fix RHSA-2024:0021
-
Red Hat Enterprise Linux Client (v. 7) firefox 115.6.0-1.el7_9, thunderbird 115.6.0-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 115.6.0-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 115.6.0-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 115.6.0-1.el7_9, thunderbird 115.6.0-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 115.6.0-1.el7_9, thunderbird 115.6.0-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 115.6.0-1.el7_9fixed: vendor fix RHSA-2024:0026
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
Exploit prediction
1.09% chance of exploitation in the next 30 days, higher than 65% 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 ESR
- Mozilla Thunderbird
- Mozilla Firefox
Classification
- Weakness
-
- CWE-416 Use After Free
References
-
mozilla.org
/security/advisories/mfsa2023-54/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2023-55/
vendor-advisory
-
mozilla.org
/security/advisories/mfsa2023-56/
vendor-advisory
-
bugzilla.mozilla.org
/show_bug.cgi?id=1840144
issue-tracking, permissions-required
-
debian.org
/security/2023/dsa-5581
third-party-advisory
-
debian.org
/security/2023/dsa-5582
third-party-advisory
-
lists.debian.org
/debian-lts-announce/2023/12/msg00020.html
mailing-list, third-party-advisory
-
lists.debian.org
/debian-lts-announce/2023/12/msg00021.html
mailing-list, third-party-advisory
-
security.gentoo.org
/glsa/202401-10
third-party-advisory
Sources
- CVE List CVE-2023-6859
- NVD CVE-2023-6859
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.