The HTML Help ActiveX control (Hhctrl.ocx) in Microsoft Windows 2000 SP3, XP SP2 and Professional, 2003 SP1 allows remote attackers to execute arbitrary code via unspecified functions, related to uninitialized parameters.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A125
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-008
http://www.vupen.com/english/advisories/2007/0577
http://www.us-cert.gov/cas/techalerts/TA07-044A.html
http://www.securitytracker.com/id?1017635
http://www.securityfocus.com/bid/22478