Severity Rating: Critical
Revision Note: V1.1 (July 9, 2013): Bulletin revised to announce that Microsoft is aware of targeted attacks attempting to exploit the vulnerability described in CVE-2013-3163 through Internet Explorer 8. Applying this security update protects customers from exploitation of this vulnerability.
Summary: This security update resolves seventeen privately reported vulnerabilities in Internet Explorer. The most severe vulnerabilities could allow remote code execution if a user views a specially crafted webpage using Internet Explorer. An attacker who successfully exploited the most severe of these vulnerabilities could gain the same user rights as the current user. Users whose accounts are configured to have fewer user rights on the system could be less impacted than users who operate with administrative user rights.