CVE-2023-25746: Memory safety bugs present in Firefox ESR 102.7.

Patch / fix

fixed in 2 distros 8

Mozilla Thunderbird 102.8
Mozilla Firefox ESR 102.8

debian ubuntu red hat suse opensuse almalinux rocky linux alpine

firefox-esr Debian 14, Debian 13, Debian 12 102.8.0esr-1
thunderbird Debian 14, Debian 13, Debian 12 1:102.8.0-1

debian advisories DEBIAN-CVE-2023-25746

thunderbird Ubuntu 18.04 LTS 1:102.8.0+build2-0ubuntu0.18.04.1
thunderbird Ubuntu 20.04 LTS 1:102.8.0+build2-0ubuntu0.20.04.1
thunderbird Ubuntu 22.04 LTS 1:102.8.0+build2-0ubuntu0.22.04.1

ubuntu advisories UBUNTU-CVE-2023-25746

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 9 102.8.0-2.el9_1
thunderbird RHEL 8 102.8.0-2.el8_7
thunderbird RHEL 7 102.8.0-2.el7_9
firefox RHEL 8 102.8.0-2.el8_7
firefox RHEL 9 102.8.0-2.el9_1
firefox-x11 RHEL 9 102.8.0-2.el9_1
firefox RHEL 7 102.8.0-2.el7_9
thunderbird RHEL 8.2 TUS, RHEL 8.2 E4S, RHEL 8.2 AUS 102.8.0-2.el8_2

red hat advisories RHSA-2023:0824 RHSA-2023:0821 RHSA-2023:0819 RHSA-2023:0823 RHSA-2023:0817 RHSA-2023:0818

MozillaThunderbird SLE Workstation Extension 15 SP4, SLE Module for Package Hub 15 SP4, openSUSE Leap 15.4 102.8.0-150200.8.105.2
MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +6 more 102.8.0-112.150.1
MozillaFirefox SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +9 more 102.8.0-150200.152.78.1
MozillaFirefox SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 102.8.0-150000.150.76.1

suse advisories SUSE-SU-2023:0599-1 SUSE-SU-2023:0469-1 SUSE-SU-2023:0466-1 SUSE-SU-2023:0461-1

MozillaThunderbird openSUSE Tumbleweed 102.8.0-1.1

opensuse advisories openSUSE-SU-2024:12713-1

firefox AlmaLinux 8 102.8.0-2.el8_7.alma
firefox AlmaLinux 9 102.8.0-2.el9_1.alma
firefox-x11 AlmaLinux 9 102.8.0-2.el9_1.alma
thunderbird AlmaLinux 8 102.8.0-2.el8_7.alma
thunderbird AlmaLinux 9 102.8.0-2.el9_1.alma

almalinux advisories ALSA-2023:0808 ALSA-2023:0810 ALSA-2023:0821 ALSA-2023:0824

firefox Rocky Linux 9 102.8.0-2.el9_1
thunderbird Rocky Linux 9 102.8.0-2.el9_1
firefox Rocky Linux 8 102.8.0-2.el8_7
thunderbird Rocky Linux 8 102.8.0-2.el8_7

rocky linux advisories RLSA-2023:0810 RLSA-2023:0824 RLSA-2023:0808 RLSA-2023:0821

firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 102.8.0-r0

alpine advisories ALPINE-CVE-2023-25746

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-2023-25746 updated 2026-11-07 cvss 8.8

Mozilla: Memory safety bugs fixed in Firefox ESR 102.8

Red Hat Enterprise Linux 6 firefox, thunderbird
affected: no fix planned “Out of support scope”
Red Hat Enterprise Linux AppStream (v. 8) firefox 102.8.0-2.el8_7, thunderbird 102.8.0-2.el8_7
fixed: vendor fix RHSA-2023:0808
Red Hat Enterprise Linux AppStream (v. 9) firefox 102.8.0-2.el9_1, firefox-x11 102.8.0-2.el9_1, thunderbird 102.8.0-2.el9_1
fixed: vendor fix RHSA-2023:0810
Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 102.8.0-2.el8_2, thunderbird 102.8.0-2.el8_2
fixed: vendor fix RHSA-2023:0811
Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 102.8.0-2.el8_1, thunderbird 102.8.0-2.el8_1
fixed: vendor fix RHSA-2023:0806
Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox 102.8.0-2.el8_2, thunderbird 102.8.0-2.el8_2
fixed: vendor fix RHSA-2023:0811
Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox 102.8.0-2.el8_4, thunderbird 102.8.0-2.el8_4
fixed: vendor fix RHSA-2023:0805
Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox 102.8.0-2.el8_6, thunderbird 102.8.0-2.el8_6
fixed: vendor fix RHSA-2023:0807

show 3 more

Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox 102.8.0-2.el9_0, thunderbird 102.8.0-2.el9_0
fixed: vendor fix RHSA-2023:0809
Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox 102.8.0-2.el8_2, thunderbird 102.8.0-2.el8_2
fixed: vendor fix RHSA-2023:0811
Red Hat Enterprise Linux Client (v. 7) firefox 102.8.0-2.el7_9, thunderbird 102.8.0-2.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 102.8.0-2.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 102.8.0-2.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 102.8.0-2.el7_9, thunderbird 102.8.0-2.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 102.8.0-2.el7_9, thunderbird 102.8.0-2.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 102.8.0-2.el7_9
fixed: vendor fix RHSA-2023:0812

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: 21 mo ago (2025-01-09)

Exploit prediction

0.67% chance of exploitation in the next 30 days, higher than 52% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
NVD	3.1	8.8	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
CNA	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 Thunderbird
Mozilla Firefox ESR

Classification

Weakness

CWE-787 Out-of-bounds Write

References

mozilla.org /security/advisories/mfsa2023-06/
vendor-advisory
mozilla.org /security/advisories/mfsa2023-07/
vendor-advisory
bugzilla.mozilla.org /buglist.cgi?bug_id=1544127%2C1762368
broken-link, issue-tracking, vendor-advisory

Sources

CVE List CVE-2023-25746
NVD CVE-2023-25746

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.

Summary