There’s a rising risk of denial of service attacks due to the widespread use of smart devices like thermostats, TVs and fridges, which are often built “with no thought to security,” according to former Department of Homeland Security Director Michael Chertoff.

It’s a serious threat, as companies like Mastercard and Amazon partner with appliance makers like Samsung and Whirlpool to enable refrigerators and dishwashers to restock themselves by placing orders over the Internet.

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