In the Bordeaux region, attackers reportedly changed temperature and defrost settings, raising the temperature setting for frozen food from −22°C to 150°C. Technicians detected the abnormal rise around 4 a.m. and intervened before any stock had to be discarded. A supermarket in the Tarn region also reportedly suffered a break in its cold chain after its Dixell system was affected.
The initial attacks affected 700 supermarkets, the French government said, forcing stores to discard spoiled food and causing fires. Danfoss said most affected units were legacy equipment that no longer received security updates. Claroty had identified a date-based password vulnerability in Danfoss AK-SM 800A controllers in August, but the flaw used in the attacks remains unknown. Investigators have not identified the perpetrators, and no one has claimed responsibility.