Hackers raised freezer temperatures in supermarkets in about 10 countries. Stores discarded food.
UK food suppliers were also hit, though experts said the impact was minimal. Experts blamed outdated technology and weak passwords.
Why it matters: It shows how connected appliances can be attacked, costing retailers food and money.
Freezers and fridges at dozens of shops across Europe overheated overnight. Temperatures rose as high as 50C. Danish maker Danfoss said its products were involved. The EU called it a deliberate attempt to disrupt the food supply.
Why it matters: Food was thrown away and the hack shows how connected equipment can be attacked.