Modicon PLC IO Scan Status SNMP Request Scan Status Remote Disclosure

Medium Nessus Plugin ID 23824


It is possible to obtain the scan status of a Modicon PLC using an SNMP Get Request.


The Modicon Quantum, Premium and Momentum brands of PLC's have a private SNMP MIB that is available on the Internet. The scan status has been 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: 23824

File Name: scada_modicon_snmp_iostatus.nbin

Version: $Revision: 1.30 $

Type: remote

Family: SCADA

Published: 2006/12/11

Modified: 2018/01/29

Dependencies: 19762, 23823

Risk Information

Risk Factor: Medium


Base Score: 5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:N/A:N

Vulnerability Information

Required KB Items: SNMP/community, SCADA/Device/Modicon

Reference Information

OSVDB: 78612