CVE-2006-1651
** DISPUTED **
Microsoft ISA Server 2004 allows remote attackers to bypass certain filtering rules, including ones for (1) ICMP and (2) TCP, via IPv6 packets. NOTE: An established researcher has disputed this issue, saying that "Neither ISA Server 2004 nor Windows 2003 Basic Firewall support IPv6 filtering … This is different network protocol."
Date published : 2006-04-06
http://www.securityfocus.com/archive/1/429816/100/0/threaded
http://www.securityfocus.com/archive/1/429846/100/0/threaded