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CVE-2025-2857

CriticalPublished

Incorrect handle could lead to sandbox escapes

Published: Mar 27, 2025
Updated: Jun 9, 2026
Assigning CNA: mozilla
Evidence observed: Aug 28, 2026

Primary CVSS

10.0/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

1.9%

Low · next 30 days

Percentile: 78.3%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

ChromSploit-FrameworkExploit
Advanced AI-Powered Exploitation Framework | CVE-2025-4664 & CVE-2025-2783 & CVE-2025-2857 & CVE-2025-30397 |

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