An elevation of privilege vulnerability was found in Microsoft Defender. Malicious users can exploit this vulnerability via specially crafted command to gain privileges.
Microsoft System Center 2012 Endpoint Protection
Microsoft Forefront Endpoint Protection 2010
Microsoft Security Essentials
Microsoft System Center Endpoint Protection
Microsoft System Center 2012 R2 Endpoint Protection
Install necessary updates from the KB section, that are listed in your Windows Update (Windows Update usually can be accessed from the Control Panel)