ICS-CERT has released an alert on an improper authentication vulnerability affecting WAGO PFC200, a Programmable Logic Controller (PLC) device. The vulnerability is exploitable by sending a TCP payload on the bound port. ICS-CERT has notified WAGO of the report and has asked it to confirm the vulnerability and identify mitigations. ICS-CERT is issuing this alert to provide notice of the report and identify baseline mitigations for reducing risks to these and other cybersecurity attacks. ICS-CERT.