Hackers turned supermarket fridges into heaters on Monday. Temperatures hit 50 degrees Celsius.
Belgium, Estonia, Finland, Ireland, Luxembourg, the Netherlands and Sweden all reported failures. Staff found ruined food in the morning.
About 40 Delhaize stores were hit. Carrefour Belgium said hackers struck 15 of its 700 stores. Colruyt reported five Spar stores attacked.
Hackers hit six Coop stores. ICA said a limited number of its stores had refrigeration problems. One attack came at 2 am.
Every freezer has a built-in defrost function that clears ice. The hackers triggered it remotely and left it running for hours.
The attackers hit older refrigeration controllers made by Danish firm Danfoss. These are legacy products with no security updates.
On October 12, hackers seized cooling units at hundreds of French supermarkets. French police reported fires and food losses.
Researchers counted 2,752 Danfoss systems still reachable from the open internet. About 1,590 of them were in France.
No group has claimed responsibility. A SentinelOne researcher says the lack of ransom demands points to sabotage, not theft.
Retailers threw out meat and dairy that had warmed up. Food kept at high temperatures for hours is unsafe to eat.
Belgian prosecutors opened an investigation. Sweden's cybersecurity centre is working on several incidents across the country.
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