Cyberattacks on Sunday night targeted Danfoss-managed refrigeration systems across hundreds of French supermarkets, heating them to 50°C for roughly six hours

Supermarket refrigeration systems are now vulnerable to remote disruption, impacting fresh food availability and pricing.

On Sunday night, a significant cyberattack targeted refrigeration systems managed by Danfoss, affecting hundreds of French supermarkets and causing their cooling units to overheat. The hackers reportedly activated automatic defrosting cycles, raising temperatures to 50°C for approximately six hours. This disruption impacted not only the refrigeration but also electronic shelf labels used for in-store pricing and potentially delivery logistics. Retailers such as Intermarché, Leclerc, and Coopérative U confirmed the attack, with Coopérative U's president describing the incident as "extremely serious." Teams were mobilized to address the issue, and an investigation has been launched into the widespread incident affecting multiple European countries including France, Belgium, and the Netherlands.

This cyberattack highlights a critical vulnerability in the industrial Internet of Things (IoT) supply chain, specifically targeting building management systems and operational technology (OT). The exploitation of Danfoss refrigeration controls demonstrates how critical infrastructure, even in seemingly low-risk sectors like retail, can be brought down by sophisticated attacks. The cascading effects on inventory management, price accuracy, and logistics suggest a broader systemic risk for businesses relying on interconnected OT systems.

The incident signals an increased threat landscape for companies that have integrated smart technologies into their physical operations. As more businesses adopt IoT for efficiency, they become susceptible to similar attacks that can have immediate and tangible consequences. The need for robust cybersecurity measures specifically designed for OT environments, beyond traditional IT security, is now more apparent than ever for retailers and other industries.