CVE-2025-2857 | Following the recent Chrome sandbox escape (CVE-2025-2783), … | CVSS 10.0 CRITICAL

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.

Metadata

CVE ID: CVE-2025-2857
State: PUBLISHED
Assigner: mozilla
Reserved: 2025-03-27 10:54 UTC
Published: 2025-03-27 13:27 UTC
Last updated: 2026-06-09 16:23 UTC
Primary CWE: CWE-668
CWE-668 Exposure of Resource to Wrong Sphere
Vendor / Product: Mozilla / Firefox
Sources: cve.org · NVD

Severity & Metrics

10.0 CRITICAL CVSS 3.1

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

SSVC — CISA Coordinator

Exploitation: none
Automatable: yes
Tech. Impact: total

Affected products (1)

Vendor	Product	Platform	Versions
Mozilla	Firefox	—	115.21.1 ≤ 115., 128.8.1 ≤ 128., 136.0.4 ≤ *

Weakness (CWE)

CWE	Source	Description
CWE-668	adp	CWE-668 Exposure of Resource to Wrong Sphere

CVSS scores (1)

Score	Severity	Version	Source	Vector
10.0	CRITICAL	3.1	adp	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H

References (4)