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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
VendorProductAffected VersionsCPESubscribe
MozillaFirefox 128.6 ~ 128.* -
MozillaThunderbird 128.6 ~ 128.* -
II. Public POCs for CVE-2025-0239
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III. Intelligence Information for CVE-2025-0239
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IV. Related Vulnerabilities
Same product: Firefox
Same vendor: Mozilla
V. Comments for CVE-2025-0239

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