Modicon PLC IO Scan Status Disclosure

Medium Nessus Network Monitor Plugin ID 3856


The remote host may give an attacker information useful for future attacks.


The Modicon Quantum, Premium and Momentum brands of PLCs have a private SNMP MIB that is available on the Internet. The scan status may be obtained via an SNMP Get Request. The scan status is either idle, operational or stopped. An attacker may use this information to determine the status of a PLC.


Change default community strings to a value not easily guessed and filter access to the SNMP port.

Plugin Details

Severity: Medium

ID: 3856

File Name: 3856.prm

Family: SCADA

Published: 2006/12/11

Modified: 2017/01/31

Risk Information

Risk Factor: Medium