US-CERT is aware of a vulnerability in Microsoft Enhanced Mitigation Experience Toolkit (EMET) versions prior to 5.5. Exploitation of this vulnerability may allow a remote attacker to bypass or disable EMET to take control of an affected system.
US-CERT recommends users and administrators visit the Microsoft Security TechCenter and upgrade to EMET version 5.5. For additional information, please review the FireEye threat research blog.