The joint warning was issued by the Cybersecurity and Infrastructure Security Agency (CISA), the FBI, the Department of Health and Human Services (HHS), the Department of Agriculture (USDA), and the Department of Transportation (DOT) on November 5, 2026.

Attackers Target Internet-Connected Refrigeration Controllers

According to the advisory, malicious actors are targeting unpatched or internet-accessible electronic temperature controllers and commercial refrigeration management systems.

Attackers may exploit authentication bypass vulnerabilities, arbitrary code injection flaws or weak security configurations to gain unauthorized access.

Once inside, they could remotely modify temperature settings, force refrigeration units into continuous heating or defrost cycles, or disrupt temperature monitoring.

These attacks could result in spoiled food and medical supplies, equipment damage, fire hazards and potentially unsafe storage conditions.

Attacks Affect Critical Infrastructure

Industrial refrigeration and cold-chain monitoring systems are widely used across several sectors, including:

• Food production and grocery retail
• Healthcare and pharmaceutical storage
• Agriculture and chemical facilities
• Cold storage warehouses
• Transportation and refrigerated logistics

The warning follows multiple cyberattack incidents affecting supermarkets across Europe. Attackers reportedly manipulated refrigeration systems, causing temperature spikes and forcing retailers to discard spoiled inventory.

A separate incident also affected refrigeration equipment at three facilities operated by the French Blood Establishment, where temperature and defrost settings were reportedly altered.

U.S. Agencies Issue Security Recommendations

The agencies have urged organizations operating industrial refrigeration systems to strengthen their cybersecurity defenses.

Recommended measures include:

• Remove unnecessary remote access and public internet exposure.
• Apply available security patches and firmware updates.
• Replace default passwords and enforce strong authentication.
• Isolate operational technology (OT) systems from corporate networks.
• Identify internet-accessible refrigeration controllers.
• Replace outdated equipment that no longer receives security updates.
• Secure remote access that is operationally necessary.

Growing Cybersecurity Risks to Operational Technology

The warning highlights the increasing exposure of operational technology systems to cyber threats. Unlike conventional IT attacks, compromises involving industrial control systems can cause direct physical and operational consequences.

Organizations relying on refrigeration and cold-chain infrastructure should review their exposed assets, strengthen network segmentation and improve monitoring of industrial control environments.

The agencies have emphasized that organizations depending on refrigeration and temperature-monitoring systems should treat themselves as potential targets and take preventive action.

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