CVE-2025-2857 - CVE House

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Status published Unknown CVE-2025-2857

Incorrect handle could lead to sandbox escapes

0 CVSS

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

Andrew McCreight

References

More from Mozilla

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Memory safety bugs fixed in Firefox 142 and Thunderbird 142

Spoofing issue in the Address Bar component of Firefox Focus for Android

Memory safety bugs fixed in Firefox ESR 115.27, Firefox ESR 128.14, Thunderbird ESR 128.14, Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142

Memory safety bugs fixed in Firefox ESR 140.2, Thunderbird ESR 140.2, Firefox 142 and Thunderbird 142

Spoofing issue in the Address Bar component

Affected Vendor

Mozilla

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Affected Software

Firefox

Vulnerable Versions:

115.21.1, 128.8.1, 136.0.4

Timeline

Official Publish: March 27th, 2025

Last Modified: June 9th, 2026

Added to House: July 22nd, 2026

CVSS Vectors

No vector data available

Weaknesses (CWE)

No CWE data available

MITRE ATT&CK TTPs

No associated TTPs found for this vulnerability.