CVE-2025-0239— Alt-Svc ALPN validation failure when redirected
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I. Basic Information for CVE-2025-0239
Vulnerability Information
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Vulnerability Title
Alt-Svc ALPN validation failure when redirected
Source: NVD (National Vulnerability Database)
Vulnerability Description
When using Alt-Svc, ALPN did not properly validate certificates when the original server is redirecting to an insecure site. This vulnerability was fixed in Firefox 134, Firefox ESR 128.6, Thunderbird 134, and Thunderbird 128.6.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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，该漏洞源于使用Alt-Svc时，如果原始服务器重定向到不安全的站点，ALPN无法正确验证证书。
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-2025-0239
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2025-0246 | 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-2025-0240 | Compartment mismatch when parsing JavaScript JSON module | |
| 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
- CVE-2026-8093
Memory safety bugs fixed in Thunderbird 150.0.2 - CVE-2026-8094
Other issue in the WebRTC component - CVE-2026-8092
Memory safety bugs fixed in Thunderbird ESR 140.10.2 and Thu - CVE-2026-8091
Incorrect boundary conditions in the Audio/Video: Playback c - CVE-2026-8090
Use-after-free in the DOM: Networking component
Same vendor: Mozilla
- CVE-2026-8093
Memory safety bugs fixed in Thunderbird 150.0.2 - CVE-2026-8094
Other issue in the WebRTC component - CVE-2026-8092
Memory safety bugs fixed in Thunderbird ESR 140.10.2 and Thu - CVE-2026-8091
Incorrect boundary conditions in the Audio/Video: Playback c - CVE-2026-8090
Use-after-free in the DOM: Networking component
V. Comments for CVE-2025-0239
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