Buffer overflow in the authentication function for Microsoft SQL Server 2000 and Microsoft Desktop Engine (MSDE) 2000 allows remote attackers to execute arbitrary code via a long request to TCP port 1433, aka the "Hello" overflow.
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2002/ms02-056
http://www.securityfocus.com/bid/5411
http://www.iss.net/security_center/static/9788.php
http://www.ciac.org/ciac/bulletins/n-003.shtml