CVE-2025-3032

Leaking file descriptors from the fork server

HIGH

7.4

CVSS Score

Published: April 1, 2025 at 12:29 PM UTC

Updated: September 30, 2026 at 06:10 PM UTC

2 products affected across 1 vendorFirefoxThunderbird

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Severity

HIGH7.4

Exploit prediction

EPSS 0.4%

SSVC

No known exploit

Description

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

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Firefox · Mozilla

95%

v < 137.0

Vendor states this is fixed in 137 (unaffected)

Affected range stops below 137.0, so it looks safe — our inference, not a vendor statement

Thunderbird · Mozilla

95%

v < 137.0

Vendor states this is fixed in 137 (unaffected)

Affected range stops below 137.0, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Issue TrackingPermissions Required

Source: [email protected]

https://bugzilla.mozilla.org/show_bug.cgi?id=1949987

Vendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2025-20/

Vendor Advisory

Source: [email protected]

https://www.mozilla.org/security/advisories/mfsa2025-23/

SSVC — Action Prioritization

SSVCNo known exploitAutomatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.4HIGHCISA-ADP

Attack Vector: NETWORK
Complexity: HIGH
Privileges: NONE
User Interaction: NONE
Scope: UNCHANGED
Confidentiality: HIGH
Integrity: HIGH
Availability: NONE

Vector?

Quick Info

StatusMODIFIED

CWE

CWE-403

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