CVE-2025-2857

CRITICAL 10.0

Incorrect handle could lead to sandbox escapes

CVSS Score

10.0

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	mozilla
Product	firefox
Ecosystems	Browser JavaScript
Industries	Technology
Published	Mar 27, 2025
Last Updated	Apr 13, 2026

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Affected Versions

Mozilla / Firefox

All versions affected

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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

Credits

Andrew McCreight