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CVE-2025-0240— Compartment mismatch when parsing JavaScript JSON module

Quick assessment

Affected
Mozilla Firefox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
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 134版本之前存在安全漏洞，该漏洞源于在某些情况下，将JavaScript模块解析为JSON可能会导致跨区访问，从而导致释放后重用。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.67% · P49

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution
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I. Basic Information for CVE-2025-0240

Vulnerability Information
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Vulnerability Title
Compartment mismatch when parsing JavaScript JSON module
Source: CVE Program / CVE List V5
Vulnerability Description
Parsing a JavaScript module as JSON could, under some circumstances, cause cross-compartment access, which may result in a use-after-free. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.
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 134版本之前存在安全漏洞，该漏洞源于在某些情况下，将JavaScript模块解析为JSON可能会导致跨区访问，从而导致释放后重用。
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 128.6 ~ 128.* -
Mozilla Thunderbird 128.6 ~ 128.* -

II. Public POCs for CVE-2025-0240

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III. Intelligence Information for CVE-2025-0240

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Vendor Advisories for CVE-2025-0240 (4)

Same Patch Batch · Mozilla · 2025-01-07 · 11 CVEs total

CVE-2025-0245 Lock screen setting bypass in Firefox Focus for Android
CVE-2025-0244 Address bar spoofing using an invalid protocol scheme on Firefox for Android
CVE-2025-0239 Alt-Svc ALPN validation failure when redirected
CVE-2025-0246 Address bar spoofing using an invalid protocol scheme on Firefox for Android
CVE-2025-0237 WebChannel APIs susceptible to confused deputy attack
CVE-2025-0238 Use-after-free when breaking lines in text
CVE-2025-0241 Memory corruption when using JavaScript Text Segmentation
CVE-2025-0243 Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 128.6, and Thunderbi
CVE-2025-0242 Memory safety bugs fixed in Firefox 134, Thunderbird 134, Firefox ESR 115.19, Firefox ESR
CVE-2025-0247 Memory safety bugs fixed in Firefox 134 and Thunderbird 134

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-0240

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