CVE-2018-7846

Name: CVE-2018-7846
Creator: NVD / NIST
Published: 2019-05-22T20:29:01.667+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 29.58%

Last modified Jun 17, 2026

CVE-2018-7846 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 29.58% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

29.58%

98.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-668

Affected Software

Vendor	Product	Versions
Schneider-Electric	Modicon M580 Firmware	All versions
Schneider-Electric	Modicon M340 Firmware	All versions
Schneider-Electric	Modicon Quantum Firmware	All versions
Schneider-Electric	Modicon Premium Firmware	All versions

References

https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/Vendor Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0735Exploit, Third Party Advisory
https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/Vendor Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2018-0735Exploit, Third Party Advisory

Timeline

Published: May 22, 2019
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2018-7846?

How severe is CVE-2018-7846?

CVE-2018-7846 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 29.58% probability of exploitation in the next 30 days.

How do I fix CVE-2018-7846?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2018-7846?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST