CVE-2025-2857

Published: Mar 27, 2025Modified: Jun 17, 2026

10.0

Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

Exploitability: 3.9 / Impact: 6.0

Source: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)

Description

Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code. A compromised child process could cause the parent process to return an unintentionally powerful handle, leading to a sandbox escape. The original vulnerability was being exploited in the wild. *This only affects Firefox on Windows. Other operating systems are unaffected.*. This vulnerability was fixed in Firefox 136.0.4, Firefox ESR 128.8.1, and Firefox ESR 115.21.1.

Affected (3)

Products: Mozilla: Firefox

1 product

Configuration A

1 vulnerable

Vulnerable Software	Affected Versions
Mozilla Firefox	Before 136.0.4

Configuration B

2 vulnerable

Vulnerable Software	Affected Versions
Mozilla Firefox	Before 115.21.1
Mozilla Firefox	From 128.1.0 to 128.8.1

Related CWEs

Exposure of Resource to Wrong Sphere

The product exposes a resource to the wrong control sphere, providing unintended actors with inappropriate access to the resource.

References (4)

https://bugzilla.mozilla.org/show_bug.cgi?id=1956398

Source: security@mozilla.org

Permissions Required

https://issues.chromium.org/issues/405143032

Source: security@mozilla.org

Permissions Required

https://www.cve.org/CVERecord?id=CVE-2025-2783

Source: security@mozilla.org

Third Party Advisory

https://www.mozilla.org/security/advisories/mfsa2025-19/

Source: security@mozilla.org

Vendor Advisory

Timeline

No history available yet.