Industrial devices can look deceptively simple from a cybersecurity perspective. A refrigeration controller, pump controller, PLC, HMI, or building-management interface may only expose a few settings, but those settings can directly change a physical process.

That is why CISA recommends removing operational-technology assets from the public internet whenever possible. Its Internet Exposure Reduction guidance says organizations should identify publicly reachable assets, remove exposure that is not operationally necessary, replace unsupported devices, patch systems, monitor traffic, and use stronger controls for anything that must remain remotely accessible.

Je confirme qu’une cyberattaque touche depuis cette nuit les installations de production de froid de plusieurs magasins de notre réseau @CooperativeU.
Nos équipes sont pleinement mobilisées, en lien avec les frigoristes, pour rétablir la situation au plus vite. Une enquête devra…

— Dominique Schelcher (@schelcher) October 12, 2026

Internet Access Turns a Local Problem Into a Remote One

A controller that can only be reached from a local maintenance network has a much smaller attack surface than one exposed to the public internet. Once a management interface is publicly reachable, attackers can scan for it, test default credentials, probe old firmware, or exploit a known vulnerability without ever entering the building.

BitcoinVersus.Tech’s report on hackers disrupting French supermarket refrigeration shows the physical consequence: software access can become spoiled inventory, equipment stress, or operational shutdown. The same principle applies to the HMI and SCADA systems used in plants and utilities, as well as the monitoring and control layers described in our BMS, EPMS, DCIM, SNMP, and Modbus guide.

The Safer Pattern Is Segmentation

Remote maintenance may still be necessary. The safer design is to keep the OT device on a private network and force remote users through controlled access points such as a VPN, jump host, or bastion server with strong authentication and logging. A firewall or OT DMZ can then allow only the exact traffic required between business systems and control systems.

NIST’s guidance on securing OT remote access recommends the same layered approach: encryption, MFA, segmentation, jump servers, and network visibility rather than direct exposure.

The rule is simple: if a device can change a physical process, public internet exposure should be treated as an exception that must be justified—not the default way to manage it.

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