CVE-2018-7842

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 35.0% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-05-22 · updated 2026-06-17
Weakness: CWE-290

Description

A CWE-290: Authentication Bypass by Spoofing vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause an elevation of privilege by conducting a brute force attack on Modbus parameters sent 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-2018-0741
https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0741

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