TI-2022-19503 Aliases CVE-2022-40960 GHSA-w7vf-mp9x-925q

Use after free in Mozilla Firefox ESR

LOW 31CWE-416Published 2022-12-22 · Updated 2025-04-15

Key facts

Attack vector: Network
Privileges required: None
User interaction: Required
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: Partial Red Hat: 11 fixed, 1 without a fix

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA and Red Hat. Impact type from CWE-416 and the CVSS impact.

Summary

Concurrent use of the URL parser with non-UTF-8 data was not thread-safe. This could lead to a use-after-free causing a potentially exploitable crash. This vulnerability affects Firefox ESR < 102.3, Thunderbird < 102.3, and Firefox < 105.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.01077 65th percentileScored 2026-11-07

Fix Partial Firefox ESR (Mozilla): 102.3Thunderbird (Mozilla): 102.3+1 more productRed Hat: 12 advisoriesRed Hat: 11 fixed, 1 without a fix

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
Technical impact: Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
Mozilla	Firefox ESR	before 102.3	102.3	Patch available	CNA
Mozilla	Thunderbird	before 102.3	102.3	Patch available	CNA
Mozilla	Firefox	before 105	105	Patch available	CNA

Firefox ESR VendorMozilla Affected before 102.3 Fixed in 102.3 Patch available CNA
Thunderbird VendorMozilla Affected before 102.3 Fixed in 102.3 Patch available CNA
Firefox VendorMozilla Affected before 105 Fixed in 105 Patch available CNA

CPE configurations NVD · 3

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::::	before 105.0	Vulnerable	Mozilla
cpe:2.3:a:mozilla:firefox_esr::::::::	before 102.3	Vulnerable	Mozilla
cpe:2.3:a:mozilla:thunderbird::::::::	before 102.3	Vulnerable	Mozilla

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 105.0 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 102.3 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 102.3 Vulnerable ·Mozilla

Remediation

Fix · CNA Firefox ESR (Mozilla) Fixed in 102.3
Fix · CNA Thunderbird (Mozilla) Fixed in 102.3
Fix · CNA Firefox (Mozilla) Fixed in 105

Red Hat 12 advisories

RHSA-2022:6717 Released 2022-09-26 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux AppStream (v. 9) thunderbird-102.3.0-3.el9_0
RHSA-2022:6715 Released 2022-09-26 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v. 8.2) thunderbird-102.3.0-3.el8_2
RHSA-2022:6716 Released 2022-09-26 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.1) thunderbird-102.3.0-3.el8_1

Show 9 more Red Hat advisories

RHSA-2022:6708 Released 2022-09-26 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux AppStream (v. 8) thunderbird-102.3.0-3.el8_6
RHSA-2022:6711 Released 2022-09-26 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux Client (v. 7) firefox-102.3.0-6.el7_9
- Red Hat Enterprise Linux Client Optional (v. 7) firefox-102.3.0-6.el7_9
- Red Hat Enterprise Linux Server (v. 7) firefox-102.3.0-6.el7_9
- Red Hat Enterprise Linux Server Optional (v. 7) firefox-102.3.0-6.el7_9
- Red Hat Enterprise Linux Workstation (v. 7) firefox-102.3.0-6.el7_9
- Red Hat Enterprise Linux Workstation Optional (v. 7) firefox-102.3.0-6.el7_9
RHSA-2022:6710 Released 2022-09-26 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux Client (v. 7) thunderbird-102.3.0-3.el7_9
- Red Hat Enterprise Linux Server Optional (v. 7) thunderbird-102.3.0-3.el7_9
- Red Hat Enterprise Linux Workstation (v. 7) thunderbird-102.3.0-3.el7_9
RHSA-2022:6707 Released 2022-09-26 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux AppStream EUS (v. 8.2) firefox-102.3.0-6.el8_2
RHSA-2022:6713 Released 2022-09-26 · Red Hat rating Important
thunderbird security update
- Red Hat Enterprise Linux AppStream EUS (v.8.4) thunderbird-102.3.0-3.el8_4
RHSA-2022:6702 Released 2022-09-26 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux AppStream (v. 8) firefox-102.3.0-6.el8_6
RHSA-2022:6700 Released 2022-09-26 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux AppStream (v. 9) firefox-102.3.0-6.el9_0
RHSA-2022:6701 Released 2022-09-26 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux AppStream EUS (v.8.4) firefox-102.3.0-6.el8_4
RHSA-2022:6703 Released 2022-09-26 · Red Hat rating Important
firefox security update
- Red Hat Enterprise Linux AppStream E4S (v. 8.1) firefox-102.3.0-6.el8_1

Fixed in the same release

Records fixed by the same vendor advisory or release, as the CNA lists them.

Release · 2022-12-22
Mozilla Thunderbird 102.3
8 records Highest priority Priority MEDIUM 2 MEDIUM, 6 LOW
Other records, highest priority first
- TI-2022-03017 Out-of-bounds read in Mozilla Firefox ESRPriority MEDIUM 58
- TI-2022-19505 Out-of-bounds write in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2022-02914 Incorrect default permissions in Mozilla ThunderbirdPriority LOW 35
Show all 8 records →
Release · 2022-12-22
Mozilla Firefox 105
8 records Highest priority Priority MEDIUM 2 MEDIUM, 6 LOW
Other records, highest priority first
- TI-2022-03017 Out-of-bounds read in Mozilla Firefox ESRPriority MEDIUM 58
- TI-2022-19505 Out-of-bounds write in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2022-19502 Insecure storage of sensitive information in Mozilla Firefox ESRPriority LOW 32
Show all 8 records →

Show 1 more group

Release · 2022-12-22
Mozilla Firefox ESR 102.3
7 records Highest priority Priority MEDIUM 2 MEDIUM, 5 LOW
Other records, highest priority first
- TI-2022-03017 Out-of-bounds read in Mozilla Firefox ESRPriority MEDIUM 58
- TI-2022-19505 Out-of-bounds write in Mozilla Firefox ESRPriority MEDIUM 43
- TI-2022-19502 Insecure storage of sensitive information in Mozilla Firefox ESRPriority LOW 32
Show all 7 records →

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux 6	Affected	No fix planned: Out of support scope
Red Hat Enterprise Linux AppStream (v. 8)	Fixed	RHSA-2022:6702, RHSA-2022:6708
Red Hat Enterprise Linux AppStream (v. 9)	Fixed	RHSA-2022:6700, RHSA-2022:6717
Red Hat Enterprise Linux AppStream E4S (v. 8.1)	Fixed	RHSA-2022:6703, RHSA-2022:6716
Red Hat Enterprise Linux AppStream EUS (v. 8.2)	Fixed	RHSA-2022:6707, RHSA-2022:6715
Red Hat Enterprise Linux AppStream EUS (v.8.4)	Fixed	RHSA-2022:6701, RHSA-2022:6713
Red Hat Enterprise Linux Client (v. 7)	Fixed	RHSA-2022:6710, RHSA-2022:6711
Red Hat Enterprise Linux Client Optional (v. 7)	Fixed	RHSA-2022:6711
Red Hat Enterprise Linux Server (v. 7)	Fixed	RHSA-2022:6711
Red Hat Enterprise Linux Server Optional (v. 7)	Fixed	RHSA-2022:6710, RHSA-2022:6711
Red Hat Enterprise Linux Workstation (v. 7)	Fixed	RHSA-2022:6710, RHSA-2022:6711
Red Hat Enterprise Linux Workstation Optional (v. 7)	Fixed	RHSA-2022:6711

Timeline

2026-10-02 Threatist record created from CVE-2022-40960
2026-10-03 Alias added: GHSA-w7vf-mp9x-925q

References

Advisory 3

Other 1

https://bugzilla.mozilla.org/show_bug.cgi?id=1787633

TI-2024-08981 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.8
TI-2022-09832 Use after free in Mozilla Firefox KEVCVSS 3.1CRITICAL 9.6
TI-2019-08769 Improper input validation in Mozilla Firefox ESR KEVCVSS 3.1CRITICAL 10.0
TI-2010-03577 Mozilla Firefox 3.5.x through 3.5.14 and 3.6.x through 3.6.11, Thunderbird 3.1.6 before… KEVCVSS 3.1CRITICAL 9.8
TI-2023-04799 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8
TI-2023-04477 Out-of-bounds write in Google Chrome KEVCVSS 3.1HIGH 8.8

See all 3444 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences