CVE-2018-7847 Missing authorization in Modicon M580 Modicon M340 Modicon Quantum Modicon Premium

Critical 9.8 Published 22 May 2019 Updated 5 Aug 2024

Attackers can overwrite controller configuration settings via Modbus, leading to denial of service or code execution on Schneider Electric Modicon PLCs.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2018-7847?

CVE-2018-7847 is a critical missing authorization vulnerability in Modicon M580 Modicon M340 Modicon Quantum Modicon Premium, published on 22 May 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official 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.

Weakness: CWE-287

Which versions are affected by CVE-2018-7847?

It affects 4 products.

Products include Schneider-Electric Modicon M340 Firmware, Schneider-Electric Modicon M580 Firmware, Schneider-Electric Modicon Premium Firmware, Schneider-Electric Modicon Quantum Firmware.

How do I fix CVE-2018-7847?

No fix has been published for CVE-2018-7847 yet. Limit exposure of the affected software until one is available.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2018-7847 being exploited?

There is no known exploitation of CVE-2018-7847 in the wild and no public exploit code.

Sources

Also known as GHSA-frc4-4hp9-9xxf.