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CVE-2025-2857— Incorrect handle could lead to sandbox escapes

Quick assessment

Affected
Mozilla Firefox
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Firefox和Mozilla Firefox ESR都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox(Web浏览器)的一个延长支持版本。 Mozilla Firefox 136.0.4之前版本和Mozilla Firefox ESR 128.8.1之前版本和115.21.1之前版本存在安全漏洞，该漏洞源于受损的子进程可能导致父进程返回意外强大的句柄，从而导致沙箱逃逸。

AI Predicted 9.8 Difficulty: Easy EPSS 1.90% · P78

Affected Version Matrix 3

VendorProduct Version RangeStatus
Mozilla Firefox 115.21.1≤ 115.* unaffected
128.8.1≤ 128.* unaffected
136.0.4≤ * unaffected
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I. Basic Information for CVE-2025-2857

Vulnerability Information
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Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Incorrect handle could lead to sandbox escapes
Source: CVE Program / CVE List V5
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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Firefox和Mozilla Firefox ESR 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox和Mozilla Firefox ESR都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox(Web浏览器)的一个延长支持版本。 Mozilla Firefox 136.0.4之前版本和Mozilla Firefox ESR 128.8.1之前版本和115.21.1之前版本存在安全漏洞，该漏洞源于受损的子进程可能导致父进程返回意外强大的句柄，从而导致沙箱逃逸。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox 115.21.1 ~ 115.* -

II. Public POCs for CVE-2025-2857

# POC Description Source Link Shenlong Link
1 None https://github.com/RimaRuer/CVE-2025-2857-Exploit POC Details
2 A Firefox and Tor Browser compromised child process could cause the parent process to return an unintentionally powerful handle, leading to a sandbox escape https://github.com/ubisoftinc/CVE-2025-2857 POC Details
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III. Intelligence Information for CVE-2025-2857

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Patches & Fixes for CVE-2025-2857 (1)

Vendor Advisories for CVE-2025-2857 (1)

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-2857

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