US warns hackers targeting refrigeration controllers in stores, blood banks

US authorities warn that hackers are exploiting factory-default credentials in Danfoss refrigeration controllers to alter temperatures in stores and blood banks, risking spoilage and medical supply integrity. Danfoss confirms the vulnerability stems from default passwords, indicating a systemic exposure across critical cold-chain infrastructure. The incident highlights the fragility of operational technology in essential services, though no specific casualties or outages are reported.

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