Microsoft Windows XP SP2 and SP3, Server 2003 SP2, Vista Gold, SP1, and SP2, and Server 2008 Gold and SP2 allow remote attackers to bypass intended IPv4 source-address restrictions via a mismatched IPv6 source address in a tunneled ISATAP packet, aka "ISATAP IPv6 Source Address Spoofing Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7574
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-029