The host is installed with Unreal Engine 2.0.0, 2.5.0, or 3.0.0 and is prone to an arbitrary code execution vulnerability. A flaw is present in the application, which fails to handle the Format string vulnerability in the Epic Games Unreal engine client. Successful exploitation allows remote attackers to execute arbitrary code via (1) the CLASS parameter in a DLMGR command, (2) a malformed package (PKG), and possibly (3) the LEVEL parameter in a WELCOME command.