LANMAN service on Microsoft Windows 2000 allows remote attackers to cause a denial of service (CPU/memory exhaustion) via a stream of malformed data to microsoft-ds port 445.
http://www.kb.cert.org/vuls/id/693099
http://www.iss.net/security_center/static/8867.php
http://support.microsoft.com/default.aspx?scid=kb%3B%5BLN%5D%3BQ320751
http://online.securityfocus.com/archive/1/268066
http://archives.neohapsis.com/archives/vulnwatch/2002-q2/0025.html