CVE-2019-5075: Wago Pfc 100 Firmware

Critical severity, CVSS 9.8. EPSS: 3.9% chance of exploitation in the next 30 days.

An exploitable stack buffer overflow vulnerability exists in the command line utility getcouplerdetails of WAGO PFC200 Firmware versions 03.01.07(13) and 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets sent to the iocheckd service "I/O-Check" can cause a stack buffer overflow in the sub-process getcouplerdetails, resulting in code execution. An attacker can send unauthenticated packets 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.