Developers of the open-source Metasploit penetration testing toolkit have released code that can compromise Microsoft's Internet Explorer browser, but the software is not as reliable as first thought.
The code exploits an Internet Explorer bug that was disclosed last Friday in a proof-of-concept attack posted to the Bugtraq mailing list. That first code was unreliable, but security experts worried that someone would soon develop a better version that would be adopted by cyber-criminals.
More - Metasploit releases IE attack, but it's unreliable
Microsoft Security Advisory (977981)
Link - Microsoft Security Advisory (977981): Vulnerability in Internet Explorer Could Allow Remote Code Execution