CVE-2018-17924 Missing authorization in Rockwell Automation

High 7.5 Published 7 Dec 2018 Updated 3 Jun 2026

Unauthenticated attackers can modify IP configurations on Rockwell controllers, causing communication loss and denial of service.

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-2018-17924?

CVE-2018-17924 is a high-severity missing authorization vulnerability in Rockwell Automation, published on 7 Dec 2018. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Rockwell Automation MicroLogix 1400 Controllers and 1756 ControlLogix Communications Modules An unauthenticated, remote threat actor could send a CIP connection request to an affected device, and upon successful connection, send a new IP configuration to the affected device even if the controller in the system is set to Hard RUN mode. When the affected device accepts this new IP configuration, a loss of communication occurs between the device and the rest of the system as the system traffic is still attempting to communicate with the device via the overwritten IP address.

Weakness: CWE-306

Which versions are affected by CVE-2018-17924?

It affects 16 products.

Products include Rockwellautomation 1756-En2f Series a Firmware, Rockwellautomation 1756-En2f Series B Firmware, Rockwellautomation 1756-En2f Series C Firmware, Rockwellautomation 1756-En2t Series a Firmware, Rockwellautomation 1756-En2t Series B Firmware, Rockwellautomation 1756-En2t Series C Firmware and 10 more.

How do I fix CVE-2018-17924?

No fix has been published for CVE-2018-17924 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-2018-17924 being exploited?

There is no known exploitation of CVE-2018-17924 in the wild and no public exploit code.

Sources

Also known as GHSA-w6vr-5wrp-c9p7.