One day, they will be targeting COM objects distributed by NVR vendors or NVRs in general. All it takes is one weak spot and all hell can break loose.
Right now, they are targeting SCADA systems!!
It reminds me of our first web interface. We simply wrote a custom HTTP handler that did NOTHING but serve up images and video. No execution of scripts or arbitrary code on the server (no CGI, ASP, PHP or any such thing). Was it flawless? No, but when IIS had a UNC/unicode problem that allowed a visitor to delete random files on the server (which actually happened on our web-site), we just cruised through it.