CVE-2019-6809 Denial of service in Modicon M340

High 7.5 Published 17 Sep 2019 Updated 4 Aug 2024

Attackers can cause denial of service on Schneider Electric Modicon PLCs by sending invalid data to the controller.

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-2019-6809?

CVE-2019-6809 is a high-severity denial of service vulnerability in Schneider Electric SE Modicon M340, published on 17 Sep 2019. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

A CWE-248: Uncaught Exception vulnerability exists in Modicon M580 (firmware versions prior to V2.90), Modicon M340 (firmware versions prior to V3.10), Modicon Premium (all versions), Modicon Quantum (all versions), which could cause a possible denial of service when reading invalid data from the controller.

Weakness: CWE-755, CWE-248

Which versions are affected by CVE-2019-6809?

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-2019-6809?

No fix has been published for CVE-2019-6809 yet. Limit exposure of the affected software until one is available.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2019-6809 being exploited?

There is no known exploitation of CVE-2019-6809 in the wild and no public exploit code.

Sources

Also known as GHSA-f73x-vrcr-2p7q.