Security4 dSeptember 17, 2026, 09:06

Modbus and S7 on the Public Internet: 202,686 Reachable Industrial Ports and What They Actually Expose

ZoomEye queries from September 16, 2026 found 40,917 devices on port 502 (Modbus TCP) and 161,769 on port 102 (Siemens S7). Both protocols lack built-in authentication and encryption, so anyone who can reach the port gains control over the equipment.

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Modbus and S7 on the Public Internet: 202,686 Reachable Industrial Ports and What They Actually Expose

Port 502: 40,917 reachable Modbus TCP devices
Port 102: 161,769 Siemens S7 devices
Both protocols' base specs lack authentication and encryption
Port reachability means ability to write registers and stop processes

#ZoomEye#Modbus#Siemens

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