CVE-2021-34581: Wago 750-831/000-002 Firmware

High severity, CVSS 7.5. EPSS: 1% chance of exploitation in the next 30 days.

Missing Release of Resource after Effective Lifetime vulnerability in OpenSSL implementation of WAGO 750-831/xxx-xxx, 750-880/xxx-xxx, 750-881, 750-889 in versions FW4 up to FW15 allows an unauthenticated attacker to cause DoS on the device.

Affected products

• Wago 750-831/000-002 Firmware: from fw4, up to and including fw15
• Wago 750-831 Firmware: from fw4, up to and including fw15
• Wago 750-880/025-000 Firmware: from fw4, up to and including fw15
• Wago 750-880/025-001 Firmware: from fw4, up to and including fw15
• Wago 750-880/025-002 Firmware: from fw4, up to and including fw15
• Wago 750-880/040-000 Firmware: from fw4, up to and including fw15
• Wago 750-880 Firmware: from fw4, up to and including fw15
• Wago 750-881 Firmware: from fw4, up to and including fw15
• Wago 750-889 Firmware: from fw4, up to and including fw15

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