Microsoft Internet Explorer 5.01 SP4 on Windows 2000 SP4; 6 SP1 on Windows 2000 SP4; 6 and 7 on Windows XP SP2, or Windows Server 2003 SP1 or SP2; and possibly 7 on Windows Vista does not properly "instantiate certain COM objects as ActiveX controls," which allows remote attackers to execute arbitrary code via a crafted COM object from chtskdic.dll.
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1939
https://exchange.xforce.ibmcloud.com/vulnerabilities/33252
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2007/ms07-027
http://www.vupen.com/english/advisories/2007/1712
http://www.us-cert.gov/cas/techalerts/TA07-128A.html
http://www.securitytracker.com/id?1018019
http://www.securityfocus.com/archive/1/468871/100/200/threaded