TI-2025-02647 Aliases CVE-2025-3034 GHSA-2f7m-9j2c-gwvw

Memory safety bugs fixed in Firefox 137 and Thunderbird 137

LOW 38CWE-787Published 2025-04-01 · Updated 2026-04-13

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: High
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-787 and the CVSS impact.

Summary

Memory safety bugs present in Firefox 136 and Thunderbird 136. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability was fixed in Firefox 137 and Thunderbird 137.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV

EPSS 0.00478 41st percentileScored 2026-11-07

Fix Fixed Firefox (Mozilla): 137Thunderbird (Mozilla): 137

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: None
Automatable: No
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	—	137	Patch available	CNA
Mozilla	Thunderbird	—	137	Patch available	CNA

Firefox VendorMozilla Affected — Fixed in 137 Patch available CNA
Thunderbird VendorMozilla Affected — Fixed in 137 Patch available CNA

CPE configurations NVD · 2

CPE	Versions	Role	Vendor
cpe:2.3:a:mozilla:firefox::::::::	before 137.0	Vulnerable	Mozilla
cpe:2.3:a:mozilla:thunderbird::::::::	before 137.0	Vulnerable	Mozilla

cpe:2.3:a:mozilla:firefox:*:*:*:*:*:*:*:* Versions before 137.0 Vulnerable ·Mozilla
cpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:* Versions before 137.0 Vulnerable ·Mozilla

Remediation

Fix · CNA Firefox (Mozilla) Fixed in 137
Fix · CNA Thunderbird (Mozilla) Fixed in 137

Timeline

2026-10-02 Threatist record created from CVE-2025-3034
2026-10-03 Alias added: GHSA-2f7m-9j2c-gwvw

References

Advisory 2

Other 1

Memory safety bugs fixed in Firefox 137 and Thunderbird 137

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