Vulnerability in Mozilla Firefox
CVE-2025-2857
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, l…
EPSS: 0.019 (77.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 10.0 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
Affected products
- Mozilla Firefox — versions 115.21.1, 128.8.1, 136.0.4
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security@mozilla.org (Permissions Required)
- security@mozilla.org (Permissions Required)
- security@mozilla.org (Third Party Advisory)
- security@mozilla.org (Vendor Advisory)
Frequently asked questions
- What is CVE-2025-2857?
- CVE-2025-2857 is a critical-severity vulnerability in Mozilla Firefox, classified under Exposure of Resource to Wrong Sphere. CVSS score: 10.0/10. Published 2025-03-27.
- How severe is CVE-2025-2857?
- Critical severity. CVSS v3 base score is 10.0 out of 10.
- Is CVE-2025-2857 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.