CVE-2019-5135: Wago PFC100 Firmware

Medium severity, CVSS 5.3. EPSS: 1% chance of exploitation in the next 30 days.

An exploitable timing discrepancy vulnerability exists in the authentication functionality of the Web-Based Management (WBM) web application on WAGO PFC100/200 controllers. The WBM application makes use of the PHP crypt() function which can be exploited to disclose hashed user credentials. This affects WAGO PFC200 Firmware version 03.00.39(12) and version 03.01.07(13), and WAGO PFC100 Firmware version 03.00.39(12).

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.