VULNERABILITY INTELLIGENCE

CVE-2025-2857

CVSS score10 CRITICAL

EPSS probability1.98%

CISA KEVNot currently listed

Published2025-03-27

Last modified2026-10-05

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

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.

Weakness classification

nvd@nist.gov: NVD-CWE-noinfo
134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-668

Primary references

security@mozilla.org — Permissions Required
security@mozilla.org — Permissions Required
security@mozilla.org — Third Party Advisory
security@mozilla.org — Vendor Advisory