Security vulnerabilities in LTE can allow hackers to “easily” spoof presidential alerts sent to mobile phones in the event of a national emergency.

Using off-the-shelf equipment and open-source software, a working exploit made it possible to send a simulated alert to every phone in a 50,000-seat football stadium with little effort, with the potential of causing “cascades of panic,” said researchers at the University of Colorado Boulder in a paper out this week.

Their attack worked in nine out of ten tests, they said.

Last year the Federal Emergency Management Agency sent out the first “presidential alert” test using the Wireless Emergency Alert (WEA) system. It was part of an effort to test the new state-of-the-art system to allow any president to send out a

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