7.4HIGH

CVE-2025-3032 — Leaking of file descriptors from the fork server to web content processes could allow for privilege…

Mozilla · Firefox · Published 1 Apr 2025 · Modified 30 Sept 2026

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.

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/

What to do

Check whether Firefox is in your asset inventory.
Patch in the next maintenance window; prioritise internet-facing systems.
Record the decision in your risk register for audit evidence.

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Link: adminadda.com/cve/CVE-2025-3032