CVE-2025-2857 Information

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 affects Firefox < 136.0.4 Firefox ESR < 128.8.1 and Firefox ESR < 115.21.1.

Reference

https://bugzilla.mozilla.org/show_bug.cgi?id=1956398 https://issues.chromium.org/issues/405143032 https://www.cve.org/CVERecord?id=CVE-2025-2783 https://www.mozilla.org/security/advisories/mfsa2025-19/