Trend Micro InterScan AppletTrap 2.0 does not properly filter URLs when they are modified in certain ways such as (1) using a double slash (//) instead of a single slash, (2) URL-encoded characters, (3) requesting the IP address instead of the domain name, or (4) using a leading 0 in an octet of an IP address.
archives.neohapsis.com/archives/bugtraq/2001-07/0129.html
www.securityfocus.com/bid/2996
www.securityfocus.com/bid/2998
www.securityfocus.com/bid/3000
exchange.xforce.ibmcloud.com/vulnerabilities/6816
exchange.xforce.ibmcloud.com/vulnerabilities/6817
exchange.xforce.ibmcloud.com/vulnerabilities/6818
exchange.xforce.ibmcloud.com/vulnerabilities/6819