Internet Explorer 6.0 on Windows XP SP2 allows remote attackers to execute arbitrary code by using the "Related Topics" command in the Help ActiveX Control (hhctrl.ocx) to open a Help popup window containing the PCHealth tools.htm file in the local zone and injecting Javascript to be executed, as demonstrated using "writehta.txt" and the ADODB recordset, which saves a .HTA file to the local system, aka the "HTML Help ActiveX control Cross Domain Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A3496
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A2830
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1963
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A1349
https://exchange.xforce.ibmcloud.com/vulnerabilities/18311
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2005/ms05-001
http://www.us-cert.gov/cas/techalerts/TA05-012B.html
http://www.kb.cert.org/vuls/id/972415
http://archives.neohapsis.com/archives/bugtraq/2004-12/0426.html