CVE-2018-7844 Information disclosure in Modicon M580 Modicon M340 Modicon Quantum Modicon Premium

High 7.5 Published 22 May 2019 Updated 5 Aug 2024

Attackers can read memory blocks via Modbus to disclose SNMP information from Modicon PLCs, requiring vendor patches.

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-2018-7844?

CVE-2018-7844 is a high-severity 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-200: Information Exposure vulnerability exists in all versions of the Modicon M580, Modicon M340, Modicon Quantum, and Modicon Premium which could cause the disclosure of SNMP information when reading memory blocks from the controller over Modbus.

Weakness: CWE-200

Which versions are affected by CVE-2018-7844?

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-2018-7844?

No fix has been published for CVE-2018-7844 yet. Limit exposure of the affected software until one is available.

Is CVE-2018-7844 being exploited?

There is no known exploitation of CVE-2018-7844 in the wild and no public exploit code.

Public exploit code: 1 proofs of concept on GitHub.

Sources

Also known as GHSA-6xrh-xrwx-jp62.