Windows RPC with Routing and Remote Access enabled in Windows XP and Windows Server 2003 allows an attacker to execute code on a targeted RPC server which has Routing and Remote Access enabled via a specially crafted application, aka "Windows RPC Remote Code Execution Vulnerability."
http://www.securitytracker.com/id/1038701
http://www.securityfocus.com/bid/99012
http://packetstormsecurity.com/files/161672/Microsoft-Windows-RRAS-Service-MIBEntryGet-Overflow.html