Severity Rating: Critical
Revision Note: V2.0 (December 13, 2016): Revised bulletin to announce the following updates have been rereleased with a detection change that addresses a supersedence issue that certain customers experienced when attempting to install the October Security Only updates. - Security Only update 3192391 for all supported releases of Windows 7 and Windows Server 2008 R2. For more information, see Microsoft Knowledge Base Article 3192391. - Security Only update 3192393 for Windows Server 2012. For more information, see Microsoft Knowledge Base Article 3192393 - Security Only update 3192392 for Windows 8.1 and Windows Server 2012 R2. For more information, see Microsoft Knowledge Base Article 3192392. These are detection changes only. There were no changes to the update files. Customers who have already successfully installed any of these updates do not need to take any action. For more information, see the Microsoft Knowledge Base article for the respective update.
Summary: This security update resolves vulnerabilities in Internet Explorer. The most severe of the vulnerabilities could allow remote code execution if a user views a specially crafted webpage using Internet Explorer. An attacker who successfully exploited the vulnerabilities could gain the same user rights as the current user. If the current user is logged on with administrative user rights, an attacker could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.