An estimated 700 supermarkets across France experienced a mass hack of their refrigeration systems earlier this week, leading to widespread food spoilage and fires in some locations. French authorities stated that the incident resulted from compromised Internet-connected controllers used by technicians to remotely administer store-wide cooling fleets. The attackers activated defrosters for extended periods, causing internal temperatures to rise as high as 50° Celsius (122° Fahrenheit). By the time the breach was discovered, perishable goods had spoiled, and electrical systems in certain stores caught fire. Public research reports and security advisories indicate that all three controller models reportedly involved in the incident contained critical vulnerabilities. These flaws allowed attackers to log in remotely with administrator-level system rights. The affected devices were sold by Denmark-based Danfoss and United States-based Dixell, along with its parent company Copeland. Until recently, Danfoss controllers utilized a credential that changed daily. This password was generated by publicly available firmware based on the current date. A hacker who analyzed the code could replicate this process on any device that had not received a recent update. Consequently, the daily passwords were identical across models located in hundreds or thousands of stores.