What is the severity of CVE-2018-7843?

The severity of CVE-2018-7843 is high with a severity value of 7.5.

How can I fix CVE-2018-7843?

Schneider-electric has released a security advisory with recommendations on mitigating the vulnerability. Please refer to their advisory for the appropriate fixes.

Where can I find more information about CVE-2018-7843?

For more information about CVE-2018-7843, you can refer to the Schneider-electric security advisory and the Talos Intelligence vulnerability report linked in the references.

Vulnerability/
CVE-2018-7843

high

7.5

CWE

125

22/5/2019

3/2/2022

CVE-2018-7843

First published: Wed May 22 2019(Updated: )

A CWE-248: Uncaught Exception vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause denial of service when reading memory blocks with an invalid data size or with an invalid data offset in the controller over Modbus.

Credit: cybersecurity@se.com

Affected Software	Affected Version	How to fix
Schneider-electric Modicon M580 Firmware
Schneider-electric Modicon M580
Schneider-electric Modicon M340 Firmware
Schneider-electric Modicon M340
Schneider-electric Modicon Quantum Firmware
Schneider-electric Modicon Quantum
Schneider-electric Modicon Premium Firmware
Schneider-electric Modicon Premium

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Reference Links

Frequently Asked Questions

What is the severity of CVE-2018-7843?
The severity of CVE-2018-7843 is high with a severity value of 7.5.
Which software versions are affected by CVE-2018-7843?
All versions of Schneider-electric Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium are affected by CVE-2018-7843.
What is the vulnerability in CVE-2018-7843?
CVE-2018-7843 is a CWE-248: Uncaught Exception vulnerability that can cause denial of service when reading memory blocks with an invalid data size or offset in the controller over Modbus.
How can I fix CVE-2018-7843?
Schneider-electric has released a security advisory with recommendations on mitigating the vulnerability. Please refer to their advisory for the appropriate fixes.
Where can I find more information about CVE-2018-7843?
For more information about CVE-2018-7843, you can refer to the Schneider-electric security advisory and the Talos Intelligence vulnerability report linked in the references.

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