Critical severity · published Mar 27, 2025
CVE-2025-2857
Following the recent Chrome sandbox escape (CVE-2025-2783), various Firefox developers identified a similar pattern in our IPC code
10.0
CVSS
2%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Changed
Exploitation
Is it being used?
Exploit prediction (EPSS)2.0% · higher than 80% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
FI
Firefox · Mozilla
before 136.0.4; before 115.21.1; 128.1.0 before 128.8.1 · source: NVD
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2025-2857
CVE.org
https://www.cve.org/CVERecord?id=CVE-2025-2857
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/
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