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CVE-2025-14321— Use-after-free in the WebRTC: Signaling component

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是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 146之前版本和Firefox ESR 140.6之前版本存在安全漏洞，该漏洞源于WebRTC组件存在释放后重用。

AI Predicted 8.8 Difficulty: Easy EPSS 0.58% · P45

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2025-14321

Vulnerability Information
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Vulnerability Title
Use-after-free in the WebRTC: Signaling component
Source: CVE Program / CVE List V5
Vulnerability Description
Use-after-free in the WebRTC: Signaling component. This vulnerability was fixed in Firefox 146, Firefox ESR 140.6, Thunderbird 146, and Thunderbird 140.6.
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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 146之前版本和Firefox ESR 140.6之前版本存在安全漏洞，该漏洞源于WebRTC组件存在释放后重用。
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 140.6 ~ 140.* -
Mozilla Thunderbird 140.6 ~ 140.* -

II. Public POCs for CVE-2025-14321

# POC Description Source Link Shenlong Link
1 None https://github.com/h3raklez/CVE-2025-14321 POC Details
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III. Intelligence Information for CVE-2025-14321

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Vendor Advisories for CVE-2025-14321 (4)

Same Patch Batch · Mozilla · 2025-12-09 · 13 CVEs total

CVE-2025-14322 Sandbox escape due to incorrect boundary conditions in the Graphics: CanvasWebGL component
CVE-2025-14323 Privilege escalation in the DOM: Notifications component
CVE-2025-14324 JIT miscompilation in the JavaScript Engine: JIT component
CVE-2025-14325 JIT miscompilation in the JavaScript Engine: JIT component
CVE-2025-14326 Use-after-free in the Audio/Video: GMP component
CVE-2025-14327 Spoofing issue in the Downloads Panel component
CVE-2025-14328 Privilege escalation in the Netmonitor component
CVE-2025-14329 Privilege escalation in the Netmonitor component
CVE-2025-14330 JIT miscompilation in the JavaScript Engine: JIT component
CVE-2025-14331 Same-origin policy bypass in the Request Handling component
CVE-2025-14332 Memory safety bugs fixed in Firefox 146 and Thunderbird 146
CVE-2025-14333 Memory safety bugs fixed in Firefox ESR 140.6, Thunderbird ESR 140.6, Firefox 146 and Thun

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-14321

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