vulnerability
MFSA2025-19 Firefox: Security Vulnerability fixed in Firefox 136.0.4, Firefox ESR 128.8.1, Firefox ESR 115.21.1 (CVE-2025-2857)
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 10 | (AV:N/AC:L/Au:N/C:C/I:C/A:C) | Mar 27, 2025 | Mar 28, 2025 | Nov 4, 2025 |
Severity
10
CVSS
(AV:N/AC:L/Au:N/C:C/I:C/A:C)
Published
Mar 27, 2025
Added
Mar 28, 2025
Modified
Nov 4, 2025
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.
Solutions
mozilla-firefox-esr-upgrade-115_21_1mozilla-firefox-esr-upgrade-128_8_1mozilla-firefox-upgrade-136_0_4
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