CVE-2025-3032

Leaking file descriptors from the fork server

State: Published
Severity: 7.4 High
Published: Apr 1, 2025
Updated: Apr 13, 2026
Reserved: Mar 31, 2025

Description

Leaking of file descriptors from the fork server to web content processes could allow for privilege escalation attacks. This vulnerability was fixed in Firefox 137 and Thunderbird 137.

Scores

CVSS	Score	Vector	Source
3.1	7.4 High	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N	CISA-ADP

Weaknesses

CWE-403 Exposure of File Descriptor to Unintended Control Sphere ('File Descriptor Leak')

Affected Products

Product	Versions
FirefoxMozilla	137 and laterNot affected
ThunderbirdMozilla	137 and laterNot affected

References

https://bugzilla.mozilla.org/show_bug.cgi?id=1949987
https://www.mozilla.org/security/advisories/mfsa2025-20/
https://www.mozilla.org/security/advisories/mfsa2025-23/

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