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The manufacturer says it is urging customers to take action to secure their devices by installing the software update and ensuring that the devices are shielded from the Internet behind firewalls.

“Broadcasters should check in periodically with the manufacturer to see if there have been any additional software updates,” said Ed Czarnecki of Monroe Electronics/Digital Alert Systems in Lyndonville, NY.

Of the “thousands of units” that had been installed, “fewer than 2.8 percent of our customer base have not yet taken action” to remediate the vulnerability, Mr. Czarnecki said.

He also rejected charges that the company had moved too slowly, saying the firm is “in lockstep” with the federal agencies that manage the system.

“This is a national security system, you don’t just act unilaterally,” he said.