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High VDE-2020-042 1 CVE

WAGO: PLC families 750-88x and 750-352 prone to DoS attack, versions < FW10 (Update A)

Published Oct 27, 2020 · Updated May 14, 2025 · Revision 3

Vendor: WAGO Product: 750-331/xxx-xxx Product: 750-352 Product: 750-829 Product: 750-831/xxx-xxx Product: 750-852 Product: 750-880/xxx-xxx Product: 750-881 Product: 750-882 Product: 750-885 Product: 750-889

Summary

The Web-Based Management (WBM) of WAGOs programmable logic controller (PLC) is typically used for administration, commissioning and updates.
Older firmware versions of the PLC family 750-88x and 750-352 are vulnerable for a special denial of service attack.

All newer Firmware releases since FW11, released in December 2017, are not affected.

Details

Impact
An attacker which sends a series of maliciously constructed packets to HTTP(S) ports 80/443 could cause a crashed device, that needs a power on reset to go back to normal operation.

Mitigation
* Restrict network access to the device.
* Do not directly connect the device to the internet
* Disable unused TCP/UDP-ports

Remediation
Update the device to the latest FW version available here:

https://www.wago.com/us/requestDownload?downloadFile=FWMedia_58_750-881

Vulnerabilities 1

  • High 7.5
    CVE-2020-12516

    WAGO: PLC families 750-88x and 750-352 prone to DoS attack

    Older firmware versions (FW1 up to FW10) of the WAGO PLC family 750-88x and 750-352 are vulnerable for a special denial of service attack.

    WAGO 750-882 750-852 750-881 ICS / OT

Revision history

  1. #3

    Fix: added distribution

  2. #2

    Update: deleted Issuing authority

  3. #1

    initial revision

References