The Negotiate Security Software Provider (SSP) interface in Windows 2000, Windows XP, and Windows Server 2003, allows remote attackers to cause a denial of service (crash from null dereference) or execute arbitrary code via a crafted SPNEGO NegTokenInit request during authentication protocol selection.
https://exchange.xforce.ibmcloud.com/vulnerabilities/15715
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2004/ms04-011