The IMWeb.IMWebControl.1 ActiveX control in IMWeb.dll 7.0.0.x, and possibly IMWebControl.dll, in iMesh 7.1.0.x and earlier allows remote attackers to execute arbitrary code via a certain argument to the SetHandler method.
http://www.vupen.com/english/advisories/2007/4240
http://www.securityfocus.com/archive/1/485261/100/0/threaded