mshtmled.dll in Microsoft Internet Explorer 7 and 8 allows remote attackers to execute arbitrary code via a crafted Microsoft Office document that causes the HtmlDlgHelper class destructor to access uninitialized memory, aka "Uninitialized Memory Corruption Vulnerability."
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A7482
https://docs.microsoft.com/en-us/security-updates/securitybulletins/2010/ms10-071
http://www.us-cert.gov/cas/techalerts/TA10-285A.html