Transcript for 'Smart Homes' Could Be Vulnerable to Hacking
Josh, now to the high-tech way criminals are breaking into homes by hacking so-called smarte smarthomes. And neal karlinsky got an inside look how it's done and what all of us should know. Reporter: At first, you might think thomas' house has a ghost playing with the lights. My dining room table just turned on. Reporter: It's not haunted. It's being hacked. Hadley has a so-called smarthome. Lights, tv, you name it. Wired in so he can control everything remotely. That's also left the door open to hackers. In this case, an enterprising reporter from "forbes" named cashmere hill, who found hadley's network wide-open. I had to type a simple phrase into a search engine. It gave me a list of houses using this product. Reporter: But put the two of them together. Hill in san francisco. Hadley in oregon, to demonstrate a growing concern for security experts, who worry the home break-in is evolving into the home hack-in. Anything happened? The kitchen lights turned off. It confirmed there was a way into my house that I hadn't been aware of. Reporter: So-called smarthomes are growing $1.5 billion market. Homes that include lights, thermostats, even baby monitors and cameras. All controlled by smartphones. All potentially vulnerable, according to security consultants. Is this easy to do? Yeah. I doesn't take a lot of specialized knowledge. That's I think the scariest thing. Reporter: Security experts say a surprising number of people make the same mistake. Either no password, or the factory default password. And they say a firewall is a must-have, as well. Easy fixes that too many ignore, until they're reminded the hard way. Neal karlinsky, abc news, seattle.
This transcript has been automatically generated and may not be 100% accurate.