Microsoft Windows 2000 SP4 does not properly validate an RPC server during mutual authentication over SSL, which allows remote attackers to spoof an RPC server, aka the "RPC Mutual Authentication Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1763
https://exchange.xforce.ibmcloud.com/vulnerabilities/26836
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2006/ms06-031
http://www.vupen.com/english/advisories/2006/2328
http://www.securityfocus.com/bid/18389