CVE-2019-5082: Wago PFC100 Firmware

Critical severity, CVSS 9.8. EPSS: 3.3% chance of exploitation in the next 30 days.

An exploitable heap buffer overflow vulnerability exists in the iocheckd service I/O-Check functionality of WAGO PFC200 Firmware version 03.01.07(13), WAGO PFC200 Firmware version 03.00.39(12), and WAGO PFC100 Firmware version 03.00.39(12). A specially crafted set of packets can cause a heap buffer overflow, potentially resulting in code execution. An attacker can send unauthenticated packets to trigger this vulnerability.

Affected products

• Wago PFC100 Firmware: version 03.00.39(12) only
• Wago PFC200 Firmware: version 03.00.39(12) only; version 03.01.07(13) only

Published 2020-01-08. Last modified 2026-06-17.