CVE-2018-7847

Severity: critical (CVSS 9.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 3.8% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2019-05-22 · updated 2026-06-17
Weakness: CWE-287

Description

A CWE-284: Improper Access Control vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause denial of service or potential code execution by overwriting configuration settings of the controller over Modbus.

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-2018-0742
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0743
https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0742
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0743

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