CVE-2025-2857

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.

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CVSS v3.1 Score

10.0

CRITICAL

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

Weakness Type (CWE)

CWE-668 CWE-668

Affected Products

Vendor	Product	Versions
mozilla	firefox	< 136.0.4
mozilla	firefox	< 115.21.1
mozilla	firefox	128.1.0 — 128.8.1

References

Advisories & Patches

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

Other References

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

Frequently Asked Questions

What is CVE-2025-2857? +

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. It has a CVSS v3.1 base score of 10.0 (CRITICAL).

How severe is CVE-2025-2857? +

CVE-2025-2857 has a CVSS v3.1 score of 10.0 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately.

What products are affected by CVE-2025-2857? +

CVE-2025-2857 affects products from mozilla, specifically: firefox. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-2857? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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