The Messenger Service for Windows NT through Server 2003 does not properly verify the length of the message, which allows remote attackers to execute arbitrary code via a buffer overflow attack.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A268
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A213
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2003/ms03-043
http://www.kb.cert.org/vuls/id/575892
http://www.cert.org/advisories/CA-2003-27.html