Hacking of Baby Monitor Rattles Parents

Hacker exploits vulnerabilities in routers, baby monitors to take control of device.
2:30 | 08/14/13

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Transcript for Hacking of Baby Monitor Rattles Parents
index," the bizarre story of the couple who say their baby monitor was hacked. They heard a strange voice saying horrifying thing to their 2-year-old, coming from the bedroom. How terrifying. Aditi roy has their story. Reporter: They're supposed to keep your baby safe, by letting you watch and listen to your child. But baby monitors themselves can be susceptible to misuse. And the wrong set of eyes can end up watching your child. It felt like somebody broke into our house. Reporter: Mark gilbert, said he and his wife heard a strange voice coming from their 2-year-old daughter's room, uttering disturbing messages. He said wake up, allison, you little . Reporter: Gilbert said that voice was coming from their baby monitor. He immediately unplugged the device. Gilbert believes someone hacked into his router and the camera, and saw his daughter's name on her bedroom wall. He's not the only one who says the baby monitor was compromised. In 2010, stacy saw her neighbor on her baby monitor, after the two monitors may have been on the same frequency and picked up each other's signals. It was late at night. Doing a routine check. Turn it on to see my next door neighbor putting his son to sleep, as well. Parry aftab says with the right set of circumstances, baby monitors can expose your child to the wrong people. Baby monitors come one of two ways. If one has a channel that might be easily compromised, otherwise, they're wi-fi-based. Reporter: There are ways to protect yourself. If your monitor is wi-fi-based, hide your wi-fi network and make sewer it has been ironclad password. Gilbert thinks his daughter's safer without the monitor. I'm supposed to protect her against people like this. It's a little embarrassing, to say the least. Reporter: For "good morning america," aditi roy, abc news, new york. Advice for people who use wireless baby monitors, it's important to use a strong wi-fi password with a capital letter, a number and punctuation mark. That's happened to me with my neighbor. No. Absolutely terrifying. She sang better than I did. Mine is just -- it was simple. It was like a walkie-talkie. Times are achanging. Next up, john travolta, kirstie alley, reunited again. So popular on screen in the

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

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