curl and libcurl 7.27.0 through 7.35.0, when running on Windows and using the SChannel/Winssl TLS backend, does not verify that the server hostname matches a domain name in the subject's Common Name (CN) or subjectAltName field of the X.509 certificate when accessing a URL that uses a numerical IP address, which allows man-in-the-middle attackers to spoof servers via an arbitrary valid certificate.
2014-04-18T22:14:38.587
2025-04-12T10:46:40.837
Deferred
CVSSv2: 4.0 (MEDIUM)
AV:N/AC:H/Au:N/C:P/I:P/A:N
4.9
4.9
Type | Vendor | Product | Version/Range | Vulnerable? |
---|---|---|---|---|
Application | haxx | curl | 7.27.0 | Yes |
Application | haxx | curl | 7.28.0 | Yes |
Application | haxx | curl | 7.28.1 | Yes |
Application | haxx | curl | 7.29.0 | Yes |
Application | haxx | curl | 7.30.0 | Yes |
Application | haxx | curl | 7.31.0 | Yes |
Application | haxx | curl | 7.32.0 | Yes |
Application | haxx | curl | 7.33.0 | Yes |
Application | haxx | curl | 7.34.0 | Yes |
Application | haxx | curl | 7.35.0 | Yes |
Application | haxx | libcurl | 7.27.0 | Yes |
Application | haxx | libcurl | 7.28.0 | Yes |
Application | haxx | libcurl | 7.28.1 | Yes |
Application | haxx | libcurl | 7.29.0 | Yes |
Application | haxx | libcurl | 7.30.0 | Yes |
Application | haxx | libcurl | 7.31.0 | Yes |
Application | haxx | libcurl | 7.32.0 | Yes |
Application | haxx | libcurl | 7.33.0 | Yes |
Application | haxx | libcurl | 7.34.0 | Yes |
Application | haxx | libcurl | 7.35.0 | Yes |
Application | haxx | libcurl | 7.36.0 | Yes |
Operating System | microsoft | windows | * | No |