Per this article: http://bit.ly/1gJA0yu at Tofino and Bob Radvanovsky:
- over 1,000,000 ICS/SCADA devices connected to the Internet discovered so far
- discovering approximately 5,000 new ICS/SCADA connected devices/day
Device types include, but not limited to:
- manufacturing/production control systems
- medical devices
- traffic management systems
- traffic light control/traffic cameras
- HVAC & building management systems
- security/access control to include video/audio surveillance
- data radios
and to keep it interesting, also found these connected to the Internet:
- off-road mining trucks
- crematoriums
In many cases, a web interface is enabled with default credentials in place.
I believe 1,000,000 is only a fraction of Internet-connected embedded/ICS/SCADA devices and that the rate of growth of new connections is way faster than anything that we saw in the PC days.