CVE-2021-34578
9.8 · CRITICALOverview
CVE-2021-34578 is a critical-severity vulnerability affecting wago 750-890\/040-000_firmware. It was published on August 31, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
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.
Remediation
Check the references section for vendor advisories and patches from wago. Update 750-890\/040-000_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| wago | 750-890\/040-000_firmware | 0 | Affected |
| wago | 750-890\/025-001_firmware | 0 | Affected |
| wago | 750-890\/025-002_firmware | 0 | Affected |
| wago | 750-890\/025-000_firmware | 0 | Affected |
| wago | 750-832\/000-002_firmware | 0 | Affected |
| wago | 750-362_firmware | 0 | Affected |
| wago | 750-823_firmware | 0 | Affected |
| wago | 750-832_firmware | 0 | Affected |
| wago | 750-363_firmware | 0 | Affected |
| wago | 750-862_firmware | 0 | Affected |
Frequently Asked Questions
What is CVE-2021-34578?
CVE-2021-34578 is a critical-severity vulnerability affecting wago 750-890\/040-000_firmware. It was published on August 31, 2021 and has a CVSS 3.1 base score of 9.8 (CRITICAL).
How severe is CVE-2021-34578?
This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2021-34578?
Check the references section for vendor advisories and patches from wago. Update 750-890\/040-000_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2021-34578?
CyberStrike's AI-powered security agents can automatically detect CVE-2021-34578 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
AI-driven PR review catches vulnerable dependencies before they ship.
Browser-based exploitation validates findings with real proof-of-concept.
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