CVE-2019-5166: Wago PFC200 Firmware

High severity, CVSS 7.8. EPSS: 0.8% chance of exploitation in the next 30 days.

An exploitable stack buffer overflow vulnerability exists in the iocheckd service ‘I/O-Check’ functionality of WAGO PFC 200 version 03.02.02(14). A specially crafted XML cache file written to a specific location on the device can cause a stack buffer overflow, resulting in code execution. An attacker can send a specially crafted packet to trigger the parsing of this cache file.

Affected products

• Wago PFC200 Firmware: version 03.02.02(14) only

Published 2020-03-11. Last modified 2026-06-17.