CVE-2018-7812 Information disclosure in Embedded Web Servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200

High 7.5 Published 17 Dec 2018 Updated 5 Aug 2024

Attackers can obtain security-relevant state information from Modicon PLC web servers due to inconsistent response handling.

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-2018-7812?

CVE-2018-7812 is a high-severity vulnerability in Schneider Electric SE Embedded Web Servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200, published on 17 Dec 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

An Information Exposure through Discrepancy vulnerability exists in the embedded web servers in all Modicon M340, Premium, Quantum PLCs and BMXNOR0200 where the web server sends different responses in a way that exposes security-relevant information about the state of the product, such as whether a particular operation was successful or not.

Weakness: CWE-200

Which versions are affected by CVE-2018-7812?

It affects 4 products.

Products include Schneider-Electric Modicom Bmxnor0200h Firmware, Schneider-Electric Modicom M340 Firmware, Schneider-Electric Modicom Premium Firmware, Schneider-Electric Modicom Quantum Firmware.

How do I fix CVE-2018-7812?

No fix has been published for CVE-2018-7812 yet. Limit exposure of the affected software until one is available.

Is CVE-2018-7812 being exploited?

There is no known exploitation of CVE-2018-7812 in the wild and no public exploit code.

Sources

Also known as GHSA-rx9m-w5c2-vj36.