CVE-2025-2857

CRITICAL EXPLOITED

Mozilla Firefox < 136.0.4 - Exposure to Wrong Actor

Title source: rule

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.

Exploits (1)

github SUSPICIOUS 13 stars

by Leviticus-Triage · pythonpoc

https://github.com/Leviticus-Triage/ChromSploit-Framework

View Code ZIP pw:eip

References (4)

[Permissions Required] https://bugzilla.mozilla.org/show_bug.cgi?id=1956398

[Permissions Required] https://issues.chromium.org/issues/405143032

[Third Party Advisory] https://www.cve.org/CVERecord?id=CVE-2025-2783

[Vendor Advisory] https://www.mozilla.org/security/advisories/mfsa2025-19/

Scores

CVSS v3 10.0

EPSS 0.0017

EPSS Percentile 38.4%

Attack Vector NETWORK

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

Details

VulnCheck KEV 2026-01-20

CWE

CWE-668

Status published

Products (5)

mozilla/firefox < 115.21.1

mozilla/firefox < 136.0.4

Mozilla/Firefox 115.21.1 - 115.*

Mozilla/Firefox 128.8.1 - 128.*

Mozilla/Firefox 136.0.4

Published Mar 27, 2025

Tracked Since Feb 18, 2026