What is Cyber-Physical Security?
Cyber-physical security is the practice of protecting systems where digital controls directly operate physical processes, including operational technology (OT), industrial control systems, IoT devices, embedded hardware, and critical infrastructure. It covers both the network and the physical consequences of a cyberattack on those systems.
What it does
Cyber-physical security tools protect environments where a successful attack can cause physical harm, not just data loss. These tools work across a range of assets: programmable logic controllers (PLCs), remote terminal units (RTUs), sensors, actuators, industrial gateways, building management systems, and connected field devices.
Common capabilities include:
- Asset inventory: discovering and classifying OT and IoT devices on industrial networks
- Firmware integrity monitoring: detecting unauthorized changes to device firmware below the operating system layer
- Vulnerability assessment: identifying known CVEs and misconfigurations in controllers, gateways, and embedded devices
- Zero trust access: enforcing least-privilege access to field devices and OT networks
- Protocol-aware monitoring: inspecting industrial protocols such as Modbus, DNP3, EtherNet/IP, and BACnet
- Security testing: fuzzing device protocols, extracting software bills of materials (SBOMs), and analyzing firmware for weaknesses
Why teams buy it
Standard IT security tools are built for general-purpose operating systems and TCP/IP traffic. OT environments run proprietary protocols, legacy hardware, and devices that cannot be patched or rebooted without stopping production. A breach in these environments can shut down a power grid, disable a water treatment plant, or damage physical equipment. Teams buy cyber-physical security tools because IT tools miss OT-specific threats and because the consequences of a miss are measured in safety incidents, not just data breaches.
Regulatory pressure also drives adoption. Frameworks such as IEC 62443, NERC CIP, and NIST SP 800-82 require documented controls for industrial environments.