CVE-2019-5134: Wago PFC100 Firmware

High severity, CVSS 7.5. EPSS: 2.3% chance of exploitation in the next 30 days.

An exploitable regular expression without anchors vulnerability exists in the Web-Based Management (WBM) authentication functionality of WAGO PFC200 versions 03.00.39(12) and 03.01.07(13), and WAGO PFC100 version 03.00.39(12). A specially crafted authentication request can bypass regular expression filters, resulting in sensitive information disclosure.

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