Now a US security expert says he has identified ways to remotely attack high-end surveillance cameras used by industrial plants, prisons, banks and the military. Craig Heffner, said he discovered the previously unreported bugs in digital video surveillance equipment from firms including Cisco, D-Link and TRENDnet.

They could use it as a pivot point, an initial foothold, to get into the network and start attacking internal systems. Heffner said that it was a significant threat as somebody could potentially access a camera and view it. Or they could also use it as a pivot point, an initial foothold, to get into the network and start attacking internal systems.

He will show how to exploit these bugs at the Black Hat hacking conference, which starts on July 31 in Las Vegas. Heffner said he has discovered hundreds of thousands of surveillance cameras that can be accessed via the public internet.