CVE-2019-6840 Code injection in U.motion Server

Critical 9.8 Published 17 Sep 2019 Updated 4 Aug 2024

An attacker can execute arbitrary commands on Schneider Electric U.motion KNX servers by sending a crafted message exploiting a format string vulnerability.

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-2019-6840?

CVE-2019-6840 is a critical code injection vulnerability in Schneider Electric SE U.motion Server, 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 Format String: CWE-134 vulnerability exists in U.motion Server (MEG6501-0001 - U.motion KNX server, MEG6501-0002 - U.motion KNX Server Plus, MEG6260-0410 - U.motion KNX Server Plus, Touch 10, MEG6260-0415 - U.motion KNX Server Plus, Touch 15), which could allow an attacker to send a crafted message to the target server, thereby causing arbitrary commands to be executed.

Weakness: CWE-134

Which versions are affected by CVE-2019-6840?

It affects 4 products.

Products include Schneider-Electric Meg6260-0410 Firmware, Schneider-Electric Meg6260-0415 Firmware, Schneider-Electric Meg6501-0001 Firmware, Schneider-Electric Meg6501-0002 Firmware.

How do I fix CVE-2019-6840?

No fix has been published for CVE-2019-6840 yet. Limit exposure of the affected software until one is available.

Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.

Is CVE-2019-6840 being exploited?

There is no known exploitation of CVE-2019-6840 in the wild and no public exploit code.

Sources

Also known as GHSA-j26m-33c4-8m5q.