CWE
287
Advisory Published
Updated

CVE-2021-34578: WAGO: Authentication Vulnerability in Web-Based Management

First published: Tue Aug 31 2021(Updated: )

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.

Credit: info@cert.vde.com

Affected SoftwareAffected VersionHow to fix
Wago 750-890\/040-000 Firmware<=fw07
Wago 750-890\/040-000
Wago 750-890\/025-001 Firmware<=fw07
Wago 750-890\/025-001
Wago 750-890\/025-002 Firmware<=fw07
Wago 750-890\/025-002
Wago 750-890\/025-000 Firmware<=fw07
Wago 750-890\/025-000
Wago 750-832\/000-002 Firmware<=fw07
Wago 750-832\/000-002
Wago 750-362 Firmware<=fw07
WAGO 750-362
Wago 750-823 Firmware<=fw07
WAGO 750-823
Wago 750-832 Firmware<=fw07
WAGO 750-832
Wago 750-363 Firmware<=fw07
WAGO 750-363
Wago 750-862 Firmware<=fw07
WAGO 750-862
Wago 750-891 Firmware<=fw07
WAGO 750-891
Wago 750-893 Firmware<=fw07
Wago 750-893

Remedy

Update the device to the latest FW version.

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Frequently Asked Questions

  • What is the severity of CVE-2021-34578?

    The severity of CVE-2021-34578 is critical, with a score of 8.1.

  • How does CVE-2021-34578 affect WAGO PLCs?

    CVE-2021-34578 allows an attacker with access to the WBM to read and write settings-parameters of the device without authentication on multiple WAGO PLCs in firmware versions up to FW07.

  • Which WAGO PLCs are affected by CVE-2021-34578?

    CVE-2021-34578 affects WAGO PLC models 750-890/040-000, 750-890/025-001, 750-890/025-002, 750-890/025-000, 750-832/000-002, 750-362, 750-823, 750-832, 750-363, 750-862, 750-891, and 750-893 in firmware versions up to FW07.

  • How can CVE-2021-34578 be fixed?

    To fix CVE-2021-34578, it is recommended to update the firmware of the affected WAGO PLC models to a version beyond FW07.

  • Where can I find more information about CVE-2021-34578?

    More information about CVE-2021-34578 can be found at the following reference link: https://cert.vde.com/en-us/advisories/vde-2020-044

Contact

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