Windows Server 2003 and XP SP2, with Windows Firewall turned off, allows remote attackers to cause a denial of service (CPU consumption) via a TCP packet with the SYN flag set and the same destination and source address and port, aka a reoccurrence of the "Land" vulnerability (CVE-1999-0016).
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A4978
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A482
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1685
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1288
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2006/ms06-064
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2005/ms05-019
http://www.vupen.com/english/advisories/2006/3983
http://www.securityfocus.com/archive/1/449179/100/0/threaded