A large-scale cyberattack has targeted the refrigeration systems of hundreds of French supermarkets, including Intermarche, Cooperative U, E Leclerc, Carrefour, and Monoprix. The attack, which began Sunday night and was confirmed Monday, raised fridge and freezer temperatures to as high as 50 degrees Celsius (122F), spoiling food and causing fires at several stores. Intermarche's CEO estimated losses could amount to tens of millions of euros nationwide in a single day. France's National Cybersecurity Agency (ANSSI) is investigating, identifying a vulnerability in software supplied by Danish company Danfoss, which stated affected units were running outdated firmware. The attack has also reportedly affected Spain, Portugal, Poland, Germany, and Belgium.