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01 Record

CVE-2023-3596

Rockwell Automation Allen-Bradley ControlLogix Communication Modules vulnerable to Denial of Service

HighPUBLISHEDCNA: Rockwell
CNA base score7.5 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

02 Description

Rockwell Automation Allen-Bradley ControlLogix Communication Modules vulnerable to Denial of Service

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
3.70% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 89.4% of scored records. A rank, not a probability.
NVD base score
7.5 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2023-07-12 12:51Z3 YR AGO
Last updated
2024-11-07 16:59Z1 YR AGO
Reserved
2023-07-10
Assigning CNA
Rockwell
Record state
PUBLISHED
Severity
High (CVSS 7.5)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Weaknesses
Data version
5.1
Document digest
9a55e8ec81e00a799a983e0fd3bc04fcc1a6114f9afd5fa2e4a7bb47fe4a50e4

05 Affected products

VendorProductVersionsPlatforms
Rockwell Automation1756-EN4TR Series A<=5.001—
Rockwell Automation1756-EN4TRK Series A<=5.001—
Rockwell Automation1756-EN4TRXT Series A<=5.001—
rockwellautomation1756-en4tr0 to 5.001—
rockwellautomation1756-en4trk0 to 5.001—
rockwellautomation1756-en4trxt0 to 5.001—

06 References

07 Remediation

* Update firmware. Update EN4* ControlLogix communications modules to firmware revision 5.002. * Properly segment networks. Given a cyber actor would require network connectivity to the communication module to exploit the vulnerability, organizations should ensure ICS/SCADA networks are properly segmented within the process structure as well as from the Internet and other non-essential networks. * Implement detection signatures. Use appended Snort signatures to monitor and detect anomalous Common Industrial Protocol (CIP) packets to Rockwell Automation devices.