Stack-based buffer overflow in the IConfigurationAccess interface in the Invensys Wonderware Archestra ConfigurationAccessComponent ActiveX control in Wonderware Application Server (WAS) before 3.1 SP2 P01, as used in the Wonderware Archestra Integrated Development Environment (IDE) and the InFusion Integrated Engineering Environment (IEE), allows remote attackers to execute arbitrary code via the first argument to the UnsubscribeData method.