CVE-2019-5080: Wago Pfc 100 Firmware

Critical severity, CVSS 9.1. EPSS: 1.6% chance of exploitation in the next 30 days.

An exploitable denial-of-service vulnerability exists in the iocheckd service "I/O-Check" functionality of WAGO PFC 200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). A single packet can cause a denial of service and weaken credentials resulting in the default documented credentials being applied to the device. An attacker can send an unauthenticated packet to trigger this vulnerability.

Affected products

• Wago Pfc 100 Firmware: version 03.00.39(12) only
• Wago Pfc 200 Firmware: version 03.00.39(12) only; version 03.01.07(13) only

Published 2019-12-18. Last modified 2026-06-17.