TI-2023-04762 Aliases CVE-2023-5174 GHSA-8fw2-629c-5885

Use after free in Mozilla Firefox

MEDIUM 51CWE-416Published 2023-09-27 · Updated 2025-05-05

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

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

Summary

If Windows failed to duplicate a handle during process creation, the sandbox code may have inadvertently freed a pointer twice, resulting in a use-after-free and a potentially exploitable crash. *This bug only affects Firefox on Windows when run in non-standard configurations (such as using `runas`). Other operating systems are unaffected.* This vulnerability affects Firefox < 118, Firefox ESR < 115.3, and Thunderbird < 115.3.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.012 68th percentileScored 2026-11-07

Fix Fixed Firefox (Mozilla): 118Firefox ESR (Mozilla): 115.3+1 more product

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: Yes
Technical impact: Total

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	before 118	118	Patch available	CNA
Mozilla	Firefox ESR	before 115.3	115.3	Patch available	CNA
Mozilla	Thunderbird	before 115.3	115.3	Patch available	CNA

Firefox VendorMozilla Affected before 118 Fixed in 118 Patch available CNA
Firefox ESR VendorMozilla Affected before 115.3 Fixed in 115.3 Patch available CNA
Thunderbird VendorMozilla Affected before 115.3 Fixed in 115.3 Patch available CNA

CPE configurations NVD · 4

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::::	before 118	Vulnerable	Mozilla
cpe:2.3:a:mozilla:firefox_esr::::::::	before 115.3	Vulnerable	Mozilla
cpe:2.3:a:mozilla:thunderbird::::::::	before 115.3	Vulnerable	Mozilla
cpe:2.3:o:microsoft:windows:-:::::::*	not specified by NVD	Running on	Microsoft

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 118 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:firefox_esr:*:*:*:*:*:*:*:* Versions before 115.3 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 115.3 Vulnerable ·Mozilla
cpe:2.3:o:microsoft:windows:-:*:*:*:*:*:*:* Versions not specified by NVD Running on ·Microsoft

Remediation

Fix · CNA Firefox (Mozilla) Fixed in 118
Fix · CNA Firefox ESR (Mozilla) Fixed in 115.3
Fix · CNA Thunderbird (Mozilla) Fixed in 115.3

Fixed in the same release

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

Release · 2023-09-27
Mozilla Firefox 118
9 records Highest priority Priority MEDIUM 5 MEDIUM, 4 LOW
Other records, highest priority first
- TI-2023-04764 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 52
- TI-2023-04763 Use after free in Mozilla FirefoxPriority MEDIUM 51
- TI-2023-04760 Use after free in Mozilla FirefoxPriority MEDIUM 51
Show all 9 records →
Release · 2023-09-27
Mozilla Firefox ESR, Thunderbird 115.3
5 records Highest priority Priority MEDIUM 3 MEDIUM, 2 LOW
Other records, highest priority first
- TI-2023-04764 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 52
- TI-2023-04756 Out-of-bounds write in Mozilla FirefoxPriority MEDIUM 51
- TI-2023-04759 Use after free in Mozilla FirefoxPriority LOW 31
Show all 5 records →

Vendor assessments

Red Hat

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

Not affected: 4 products

Red Hat Enterprise Linux 6
Red Hat Enterprise Linux 7
Red Hat Enterprise Linux 8
Red Hat Enterprise Linux 9

Timeline

2026-10-02 Threatist record created from CVE-2023-5174
2026-10-03 Alias added: GHSA-8fw2-629c-5885

References

Advisory 3

Other 1

https://bugzilla.mozilla.org/show_bug.cgi?id=1848454

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