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The @FBI and our partners are seeing malicious cyber activity targeting industrial refrigeration and cold-chain monitoring systems around the world. These systems help keep food, medicine, and other products at safe temperatures and are widely used across critical infrastructure sectors. Attackers are targeting electronic temperature and refrigeration controllers, particularly in grocery stores and cold storage facilities. In at least one recent incident, attackers targeted refrigeration components at three foreign blood service facilities. While this attack was unsuccessful due to the proper alert mechanisms in place, security weaknesses in unpatched or internet-accessible controllers can allow attackers to change system settings, potentially causing inventory loss and equipment damage. The FBI urges organizations using these systems to take the following steps: ➡️ Take controllers off the public internet ➡️ Put access behind a firewall ➡️ Change default passwords ➡️ Learn how vendors configure devices ➡️ Set safe temperature limits ➡️ Ensure alerts reach the right contacts For technical details and more information on how to protect these systems, read our advisory: https://t.co/706NrSgXIp

— FBI Cyber Branch (@FBICyberBranch) November 5, 2026