This cumulative security update resolves seven privately reported vulnerabilities and one publicly disclosed vulnerability in Internet Explorer. The more severe vulnerabilities could allow remote code execution if a user views a specially crafted Web page using Internet Explorer. This security update is rated Critical for all supported releases of Internet Explorer.
http://www.microsoft.com/technet/securi ... 0-002.mspx
CISSP, MCSE, CSTA, Security+ SME