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The PRNI, which launched in late 2022, is one of the most tactile ways in which CISA helps protect critical infrastructure organizations. When CISA gets intelligence from a partner about hackers prepping ransomware activity on a victim network, it alerts the victim.

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In an interview with the SANS Institute in August, Stern said the PRNI had delivered 4,300 warnings — including some to foreign governments about targeted companies in their countries — and saved victims roughly $9 billion in economic damages.

For at least the past several months, Stern has been the only CISA employee staffing the PRNI. One source called him "absolutely critical to national security." Another source said the PRNI was "some of the most impactful work CISA does."

In a statement, CISA said the PRNI "has not stopped" and added that the agency continues to focus "squarely on executing its statutory mission," including "delivering timely, actionable cyber threat intelligence" to partners.