CVE-2025-2857

critical

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.

References

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

https://www.securityweek.com/chrome-zero-day-exploitation-linked-to-hacking-team-spyware/

https://www.infosecurity-magazine.com/news/chrome-zero-day-flaw-exploited/

https://www.bleepingcomputer.com/news/security/italian-spyware-vendor-linked-to-chrome-zero-day-attacks/

https://securityaffairs.com/183913/apt/memento-labs-the-ghost-of-hacking-team-has-returned-or-maybe-it-was-never-gone-at-all.html

https://securelist.com/forumtroll-apt-hacking-team-dante-spyware/117851/

https://www.theregister.com/2025/03/28/google_kaspersky_mozilla/

https://therecord.media/firefox-sandbox-vulnerability-similar-chrome-zero-day

https://thehackernews.com/2025/03/mozilla-patches-critical-firefox-bug.html

https://www.bleepingcomputer.com/news/security/mozilla-warns-windows-users-of-critical-firefox-sandbox-escape-flaw/

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

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

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

Details

Source: Mitre, NVD

Published: 2025-03-27

Updated: 2026-04-13

Risk Information

CVSS v2

Base Score: 10

Vector: CVSS2#AV:N/AC:L/Au:N/C:C/I:C/A:C

Severity: Critical

CVSS v3

Base Score: 10

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

Severity: Critical

EPSS

EPSS: 0.00049