A vulnerability affecting emergency alert systems supplied by ATI Systems, one of the leading suppliers of warning sirens in the USA, could be exploited remotely via radio frequencies to activate all the sirens and trigger false alarms. “We first found the vulnerability in San Francisco, and confirmed it in two other US locations including Sedgwick County, Wichita, Kansas,” Balint Seeber, Director of Threat Research at Bastille, told Help Net Security.

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