Omron PLC CJ/CS Series ICSA-19-346-02 Multiple Security Vulnerabilities



Date Discovered

December 12, 2019


Omron PLC CJ and CS Series are prone to multiple security vulnerabilities. An attacker may leverage these issues to bypass the authentication mechanism and gain unauthorized access to the affected application. The following products of Omron Programmable Logic Controllers are affected: Omron PLC CS series Omron PLC CJ series

Technologies Affected

  • Omron PLC CJ series
  • Omron PLC CS series


Block external access at the network boundary, unless external parties require service.
Filter access to the affected computer at the network boundary if global access isn't needed. Restricting access to only trusted computers and networks might greatly reduce the likelihood of a successful exploit.

Deploy network intrusion detection systems to monitor network traffic for malicious activity.
Deploy a NID sensor between the network perimeter and the affected service. Flag on all requests that appear to be anomalous. Audit logs regularly for evidence of attacks.

Updates are available. Please see the references or vendor advisory for more information.



Wang Zhibei and n0b0dy.

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