Auth bypass in Rockwellautomation 1756-En2f Series A

CVE-2018-17924

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.

Vulnerability class: Broken Authentication

Published · last modified .

CVSS v3 metric

CVSS v3 base score 8.6 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.043 (91.1th percentile), scored .

Low probability of exploitation in the next 30 days, but still tracked. 91st percentile — 91.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2018-17924: held from 0.043 to 0.043.

EPSS over last 30 days · oldest: 0.043 · newest: 0.043 · change: 0.000

Affected products

Weakness classification (CWE)

Public proof-of-concept exploits

References

Frequently asked questions

What is CVE-2018-17924?
CVE-2018-17924 is a high-severity vulnerability in Rockwellautomation 1756-En2f Series A, classified under Missing Authentication for Critical Function. CVSS score: 8.6/10. Published 2018-12-07.
How severe is CVE-2018-17924?
High severity. CVSS v3 base score is 8.6 out of 10.
Is CVE-2018-17924 known to be exploited?
1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.