The redirect implementation in curl and libcurl 5.11 through 7.19.3, when CURLOPT_FOLLOWLOCATION is enabled, accepts arbitrary Location values, which might allow remote HTTP servers to (1) trigger arbitrary requests to intranet servers, (2) read or overwrite arbitrary files via a redirect to a file: URL, or (3) execute arbitrary commands via a redirect to an scp: URL.

Buffer overflow in curl earlier than 6.0-1.1, and curl-ssl earlier than 6.0-1.2, allows remote attackers to execute arbitrary commands by forcing a long error message to be generated.