Microsoft Windows 2000 allows remote attackers to cause a denial of service (memory consumption) by sending a flood of empty TCP/IP packets with the ACK and FIN bits set to the NetBIOS port (TCP/139), as demonstrated by stream3.
https://exchange.xforce.ibmcloud.com/vulnerabilities/8037
http://support.microsoft.com/default.aspx?scid=kb%3BEN-US%3Bq280446