The (1) CertGetCertificateChain, (2) CertVerifyCertificateChainPolicy, and (3) WinVerifyTrust APIs within the CryptoAPI for Microsoft products including Microsoft Windows 98 through XP, Office for Mac, Internet Explorer for Mac, and Outlook Express for Mac, do not properly verify the Basic Constraints of intermediate CA-signed X.509 certificates, which allows remote attackers to spoof the certificates of trusted sites via a man-in-the-middle attack for SSL sessions, as originally reported for Internet Explorer and IIS.

Baltimore Technologies WEBsweeper 4.02, when used to manage URL blacklists, allows remote attackers to bypass blacklist restrictions and connect to unauthorized web servers by modifying the requested URL, including (1) a // (double slash), (2) a /SUBDIR/.. where the desired file is in the parentdir, (3) a /./, or (4) URL-encoded characters.

Baltimore Technologies WEBsweeper 4.0 and 4.02 does not properly filter Javascript from HTML pages, which could allow remote attackers to bypass the filtering via (1) an extra leading < and one or more characters before the SCRIPT tag, or (2) tags using Unicode.

Websweeper 4.0 does not limit the length of certain HTTP headers, which allows remote attackers to cause a denial of service (memory exhaustion) via an extremely large HTTP Referrer: header.