CVE-2021-34578: Wago 750-362 Firmware

High severity, CVSS 8.1. EPSS: 1% chance of exploitation in the next 30 days.

This vulnerability allows an attacker who has access to the WBM to read and write settings-parameters of the device by sending specifically constructed requests without authentication on multiple WAGO PLCs in firmware versions up to FW07.

Affected products

• Wago 750-362 Firmware: up to and including fw07
• Wago 750-363 Firmware: up to and including fw07
• Wago 750-823 Firmware: up to and including fw07
• Wago 750-832/000-002 Firmware: up to and including fw07
• Wago 750-832 Firmware: up to and including fw07
• Wago 750-862 Firmware: up to and including fw07
• Wago 750-890/025-000 Firmware: up to and including fw07
• Wago 750-890/025-001 Firmware: up to and including fw07
• Wago 750-890/025-002 Firmware: up to and including fw07
• Wago 750-890/040-000 Firmware: up to and including fw07
• Wago 750-891 Firmware: up to and including fw07
• Wago 750-893 Firmware: up to and including fw07

Published 2021-08-31. Last modified 2026-06-17.