Cyber Resilience

CVE-2025-3032

Mozilla Firefox ≤ 137.0

Published
01 April 2025
Modified
13 April 2026
Patch / advisory
View advisory
CVSS Score v3.1 7.4
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:N
EPSS Score 0.0037 30th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2025-3032 is a high-severity File Descriptor Leak (CWE-403) vulnerability in Mozilla Firefox. Its CVSS base score is 7.4 (High).

Operationally, ranked at the 30th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified map to SC-39 (Process Isolation) and SC-4 (Information in Shared System Resources) — see the control section below for these in your framework.

EU & UK References

Vulnerability Data

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.

CWE(s)
CWE-403

Related Threats

CVEs Like This One

CVE-2026-12296Same product: Mozilla Firefox
CVE-2026-16393Same product: Mozilla Firefox
CVE-2026-12291Same product: Mozilla Firefox
CVE-2024-2612Same product: Mozilla Firefox
CVE-2026-4727Same product: Mozilla Firefox
CVE-2024-10466Same product: Mozilla Firefox
CVE-2026-12293Same product: Mozilla Firefox
CVE-2025-4089Same product: Mozilla Firefox
CVE-2024-3854Same product: Mozilla Firefox
CVE-2026-16392Same product: Mozilla Firefox

Affected Assets

mozilla
firefox
≤ 137.0
mozilla
thunderbird
≤ 137.0

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SC-39 Process Isolation partial match

Maintains separate execution domains so file descriptors cannot be unintentionally inherited by child processes.

SC-4 Information in Shared System Resources partial match

Prevents unintended information transfer via shared file descriptors between parent and child processes.

Mitigating Controls (NIST CSF 2.0) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→CSF cross-walk (authority under review) — links open the control.

PR.PS-06 mostly match
prevents

Secure SDLC practices directly include code reviews and static analysis that catch file-descriptor leaks before child-process invocation.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.29 Security testing in development and acceptance mostly match
finds

Security testing can uncover descriptor leaks but does not prevent them by itself.

A.8.25 Secure development life cycle partial match
prevents

Secure SDLC practices include code reviews and static analysis that can detect leaked descriptors.

A.8.28 Secure coding partial match
prevents

Secure coding rules require closing inherited file descriptors before spawning child processes.

A.8.3 Information access restriction none match
none

Information access restriction policies may limit which processes can use descriptors, but do not address the leak itself.

References