CVE-2018-7856

Name: CVE-2018-7856
Creator: NVD / NIST
Published: 2019-05-22T21:29:00.527+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 1.58%

Last modified Jun 17, 2026

CVE-2018-7856 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause a possible denial of Service when writing invalid memory blocks to the controller over Modbus.. EPSS estimates a 1.58% chance of exploitation in the next 30 days.

Description

A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause a possible denial of Service when writing invalid memory blocks to the controller over Modbus.

Metrics

CVSS 3.1

7.5/10

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

EPSS Probability

1.58%

72.4th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-754

Affected Software

Vendor	Product	Versions
Schneider-Electric	Modicon Premium Firmware	All versions
Schneider-Electric	Modicon Quantum Firmware	All versions
Schneider-Electric	Modicon M340 Firmware	< 3.10
Schneider-Electric	Modicon M580 Firmware	< 2.90

References

https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/Mitigation, Vendor Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2019-0767Exploit, Third Party Advisory
https://www.schneider-electric.com/en/download/document/SEVD-2019-134-11/Mitigation, Vendor Advisory
https://www.talosintelligence.com/vulnerability_reports/TALOS-2019-0767Exploit, Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2018-7856?

How severe is CVE-2018-7856?

CVE-2018-7856 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 1.58% probability of exploitation in the next 30 days.

How do I fix CVE-2018-7856?

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-2018-7856?

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

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Source: NVD / NIST