Modicon Modbus/TCP Programming Function Code Access (SCADA) (deprecated)
high Nessus Network Monitor Plugin ID 3852
Synopsis
The remote host is running an inherently insecure protocol or application.
Description
The proprietary Modbus/TCP function code 126 is active on this Modbus slave. An attacker who is able to gain network access to this device may be able to reprogram PLC logic or otherwise impact the integrity of the physical process.
Solution
Filter incoming traffic on this port to authorized Modbus TCP clients.