Smart home devices could be vulnerable to hackers

"GMA" investigates examines whether smart devices designed for the home that share a network with computers could be a way for hackers to obtain homeowners' bank information and other personal data.
3:38 | 07/05/17

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Transcript for Smart home devices could be vulnerable to hackers
Back now with "Gma investigates." Today a closer look at hacking. It's paralyzed the computers of government agencies around the world. Is your home vulnerable as well? Gio Benitez has that investigation. Good morning, gio. Reporter: George, good morning to you. If you have even just one smart device this is a story you'll need to watch because as we found your home network could be hacked within seconds so this morning, "Gma investigates." It's the hot home trend of the year, making your house smart. Turn on the light in the living room. Reporter: Smart doorbell, thermostats, a smart coffee pot or hair brush all connected to the internet ready for your commands. 21 billion devices worldwide just like these expected by 2020. But can hackers outsmart your smart devices? Well, "Gma investigates" wanted to see how vulnerable your smarthome could be to hackers so we brought in James line, head of security research for cybersecurity firm sophos. The sharks have smelled the blood in the water circling. It's time to prepare. Reporter: We brought him to this home. They have four smart devices and are adding more. I also get alerted when my garage door opens. Could somebody potentially get into our computer, into our bank accounts? Reporter: That's what we wanted to know. How easily can your personal information be accessed? So James set up their house with a wi-fi network and some devices any family might have. A DVR, one of those smart coffee pots. Sort of a back door right into your virtual information. Right, into your home, into your wireless network. Reporter: Then with James nearby our hackers lair in the backyard it's time to hack. Within one minute he's on to the network. We're into the DVR. You're in. Yeah, it was that easy. Reporter: Just like the hackers who brought down Twitter and Netflix, he's in the DVR using hacker tools. But that's not what he's after. Now, we have a computer sitting inside the network that we can use to attack other things. Reporter: He says devices like a DVR that are connected to the network are a secret gold mine because many have limited security features. They can create a gateway into devices with personal data like your banking information. Next he heads for the wi-fi connected coffee maker from his computer, he makes it work without a password. Let's make some coffee. Reporter: There it is making two cups of coffee. Reporter: I'm going to replace this software with an evil version of the brewing software. Reporter: Next he sends me inside to start using a computer that's connected to the internet. All right, let's have a look at what he's doing on his screen. Reporter: Typing in my password. Through that coffee maker he now has access to my screen. I can see him shopping online, I'm suspecting. I see everything that you need to make your own purchases online as a cybercriminal. Total copies. Let's see if we can activate his webcam. There we go. Reporter: I had no idea he could see me. Let's just prove a point here. That worked. Now it's shutting down. I think I just killed his computer. Reporter: What should you do. Know many of these smart devices with be vulnerable. Treat it like a computer. Update it. Keep it on the latest version. Make sure you have a nondefault secure password for these devices. Reporter: What do those in the industry say? Well, they urge to remember these are constantly involving so the industry including the manufacturer of that coffeemaker is currently working on making security stronger for consumers. They're working. You've got our attention. What do we do about it? We asked our expert about this and he says that your router usually has about two different networks on it. He says use one of those networks for your smart devices, use the other network for your computers but just keep your computer off when you're not using it. That's the best defense. You put tape over that camera now. I do. If Mark Zuckerberg does it, I'm going to do it too. All right, gio, thank you.

This transcript has been automatically generated and may not be 100% accurate.

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