CVE-2025-1943

Memory safety bugs fixed in Firefox 136 and Thunderbird 136

State: Published
Severity: 8.2 High
Published: Mar 4, 2025
Updated: Apr 13, 2026
Reserved: Mar 4, 2025

Description

Memory safety bugs present in Firefox 135 and Thunderbird 135. 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 136 and Thunderbird 136.

Scores

CVSS	Score	Vector	Source
3.1	8.2 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H	CISA-ADP

Weaknesses

CWE-122 Heap-based Buffer Overflow

Affected Products

Product	Versions
FirefoxMozilla	136 and laterNot affected
ThunderbirdMozilla	136 and laterNot affected

References

Memory safety bugs fixed in Firefox 136 and Thunderbird 136
https://www.mozilla.org/security/advisories/mfsa2025-14/
https://www.mozilla.org/security/advisories/mfsa2025-17/

Every record here comes from the CVE Program’s CVE List. © 1999–2026 The MITRE Corporation. CVE is a registered trademark of The MITRE Corporation. The records are reproduced under the CVE Program terms of use.