high 8.8

CVE-2023-3600 json

Use-after-free in workers

published 2023-07-12 3 y ago modified 2026-10-23 16 d ago also EUVD-2023-44249

cvss: 8.8; version 3.1, NVD
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 50%
public exploits: 0; none known

During the worker lifecycle, a use-after-free condition could have occurred, which could have led to a potentially exploitable crash. This vulnerability affects Firefox < 115.0.2, Firefox ESR < 115.0.2, and Thunderbird < 115.0.1.

Patch / fix

fixed in 3 distros 7

Mozilla Firefox 115.0.2
Mozilla Firefox ESR 115.0.2
Mozilla Thunderbird 115.0.1

ubuntu red hat suse opensuse almalinux rocky linux alpine

firefox Ubuntu 20.04 LTS 115.0.2+build1-0ubuntu0.20.04.1
thunderbird Ubuntu 20.04 LTS 1:115.3.1+build1-0ubuntu0.20.04.1
thunderbird Ubuntu 22.04 LTS 1:115.3.1+build1-0ubuntu0.22.04.2

ubuntu advisories UBUNTU-CVE-2023-3600

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

firefox RHEL 8 115.3.1-1.el8_8
thunderbird RHEL 8 115.3.1-1.el8_8
thunderbird RHEL 7 115.3.1-1.el7_9
firefox RHEL 7 115.3.1-1.el7_9
thunderbird RHEL 9 115.3.1-1.el9_2
firefox RHEL 9 115.3.1-1.el9_2
firefox-x11 RHEL 9 115.3.1-1.el9_2
thunderbird RHEL 8.2 TUS, RHEL 8.2 E4S, RHEL 8.2 AUS 115.3.1-1.el8_2

red hat advisories RHSA-2023:5432 RHSA-2023:5436 RHSA-2023:5433 RHSA-2023:5428 RHSA-2023:5475 RHSA-2023:5430

MozillaThunderbird SLE Workstation Extension 15 SP5, SLE Workstation Extension 15 SP4, SLE Module for Package Hub 15 SP5 +3 more 115.0.1-150200.8.124.1
MozillaFirefox SLES for SAP 12 SP5, SLES for SAP 12 SP4, SLES 12 SP5 +6 more 115.0.2-112.170.2
MozillaFirefox SLES for SAP 15 SP3, SLES for SAP 15 SP2, SLES 15 SP3-LTSS +11 more 115.0.2-150200.152.96.1
MozillaFirefox SLES for SAP 15 SP1, SLES 15 SP1-LTSS, SLE High Performance Computing 15 SP1-LTSS 115.0.2-150000.150.94.1

suse advisories SUSE-SU-2023:3059-1 SUSE-SU-2023:2960-1 SUSE-SU-2023:2959-1 SUSE-SU-2023:2958-1

firefox-esr openSUSE Tumbleweed 128.5.1-1.1
MozillaFirefox openSUSE Tumbleweed 115.0.2-1.1

opensuse advisories openSUSE-SU-2024:14572-1 openSUSE-SU-2024:13048-1

firefox AlmaLinux 9 115.3.1-1.el9_2.alma.1
firefox-x11 AlmaLinux 9 115.3.1-1.el9_2.alma.1
thunderbird AlmaLinux 9 115.3.1-1.el9_2.alma

almalinux advisories ALSA-2023:5434 ALSA-2023:5435

thunderbird Rocky Linux 9 115.3.1-1.el9_2
thunderbird Rocky Linux 8 115.3.1-1.el8_8

rocky linux advisories RLSA-2023:5435 RLSA-2023:5428

firefox-esr Alpine 3.23, Alpine 3.22, Alpine 3.21 +3 more 115.0.2-r0

alpine advisories ALPINE-CVE-2023-3600

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-2023-3600 updated 2026-11-07 cvss 8.8

firefox: use-after-free in workers

Red Hat Enterprise Linux AppStream (v. 8) firefox 115.3.1-1.el8_8, thunderbird 115.3.1-1.el8_8
fixed: vendor fix RHSA-2023:5433
Red Hat Enterprise Linux AppStream (v. 9) firefox 115.3.1-1.el9_2, firefox-x11 115.3.1-1.el9_2, thunderbird 115.3.1-1.el9_2
fixed: vendor fix RHSA-2023:5434
Red Hat Enterprise Linux AppStream AUS (v. 8.2) firefox 115.3.1-1.el8_2, thunderbird 115.3.1-1.el8_2
fixed: vendor fix RHSA-2023:5426
Red Hat Enterprise Linux AppStream AUS (v.8.4) firefox 115.3.1-1.el8_4, thunderbird 115.3.1-1.el8_4
fixed: vendor fix RHSA-2023:5437
Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox 115.3.1-1.el8_1, thunderbird 115.3.1-1.el8_1
fixed: vendor fix RHSA-2023:5440
Red Hat Enterprise Linux AppStream E4S (v. 8.2) firefox 115.3.1-1.el8_2, thunderbird 115.3.1-1.el8_2
fixed: vendor fix RHSA-2023:5426
Red Hat Enterprise Linux AppStream E4S (v.8.4) firefox 115.3.1-1.el8_4, thunderbird 115.3.1-1.el8_4
fixed: vendor fix RHSA-2023:5437
Red Hat Enterprise Linux AppStream EUS (v.8.6) firefox 115.3.1-1.el8_6, thunderbird 115.3.1-1.el8_6
fixed: vendor fix RHSA-2023:5436

show 5 more

Red Hat Enterprise Linux AppStream EUS (v.9.0) firefox 115.3.1-1.el9_0, thunderbird 115.3.1-1.el9_0
fixed: vendor fix RHSA-2023:5427
Red Hat Enterprise Linux AppStream TUS (v. 8.2) firefox 115.3.1-1.el8_2, thunderbird 115.3.1-1.el8_2
fixed: vendor fix RHSA-2023:5426
Red Hat Enterprise Linux AppStream TUS (v.8.4) firefox 115.3.1-1.el8_4, thunderbird 115.3.1-1.el8_4
fixed: vendor fix RHSA-2023:5437
Red Hat Enterprise Linux Client (v. 7) firefox 115.3.1-1.el7_9, thunderbird 115.3.1-1.el7_9 Red Hat Enterprise Linux Client Optional (v. 7) firefox 115.3.1-1.el7_9 Red Hat Enterprise Linux Server (v. 7) firefox 115.3.1-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7) firefox 115.3.1-1.el7_9, thunderbird 115.3.1-1.el7_9 Red Hat Enterprise Linux Workstation (v. 7) firefox 115.3.1-1.el7_9, thunderbird 115.3.1-1.el7_9 Red Hat Enterprise Linux Workstation Optional (v. 7) firefox 115.3.1-1.el7_9
fixed: vendor fix RHSA-2023:5477
Red Hat Enterprise Linux 6 firefox, thunderbird
not affected: vulnerable code not present

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 (2024-11-07)

Exploit prediction

0.63% chance of exploitation in the next 30 days, higher than 50% 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-416 Use After Free

References

bugzilla.mozilla.org /show_bug.cgi?id=1839703
issue-tracking, permissions-required, vendor-advisory
mozilla.org /security/advisories/mfsa2023-26/
vendor-advisory
mozilla.org /security/advisories/mfsa2023-27/
vendor-advisory

Sources

CVE List CVE-2023-3600
NVD CVE-2023-3600

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