CVE-2018-7846

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 29.6% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-05-22 · updated 2026-06-17
Weakness: CWE-668

Description

A CWE-501: Trust Boundary Violation vulnerability on connection to the Controller exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum and Modicon Premium which could cause unauthorized access by conducting a brute force attack on Modbus protocol to the controller.

Affected products

Schneider-Electric Modicon M340 Firmware: all versions
Schneider Electric SE Modicon M580: all versions
Schneider-Electric Modicon Premium Firmware: all versions
Modicon Quantum - all firmware versions: all versions

References

https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0735
https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0735

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