Buffer overflow in the BaseRunner ActiveX control in the Ademco ATNBaseLoader100 Module (ATNBaseLoader100.dll) 5.4.0.6, when Internet Explorer 6 is used, allows remote attackers to execute arbitrary code via a long argument to the (1) Send485CMD method, and possibly the (2) SetLoginID, (3) AddSite, (4) SetScreen, and (5) SetVideoServer methods.