CVE-2023-3596 — Where this vulnerability exists in the Rockwell Automation 1756-EN4* Ethernet/IP

Where this vulnerability exists in the Rockwell Automation 1756-EN4* Ethernet/IP communication products, it could allow a malicious user to cause a denial of service by asserting the target system through maliciously crafted CIP messages.

01What is this vulnerability?

Where this vulnerability exists in the Rockwell Automation 1756-EN4* Ethernet/IP communication products, it could allow a malicious user to cause a denial of service by asserting the target system through maliciously crafted CIP messages.

02Affected products

Vendor	Product	Versions
Rockwell Automation	1756	EN4TR Series A — <=5.001
Rockwell Automation	1756	EN4TRK Series A — <=5.001
Rockwell Automation	1756	EN4TRXT Series A — <=5.001

03Active exploitation status

Not currently listed on the CISA Known Exploited Vulnerabilities (KEV) catalog. EPSS is the best forward-looking signal — see the EPSS row above.

04Recommended remediation

• Patch to a fixed version listed in the vendor advisory (see references below).
• Mitigate with WAF rules, network egress filters, or feature flags where the patch is not yet available.
• Hunt historical logs for exploitation indicators — see Detection signatures below.

05Technical details

For the full vendor write-up, exploit chains, and reference implementations, see the references list in section 09.

06Detection signatures

Open the Sigma generator with a pre-filled prompt for this CVE to draft a starting detection in your stack of choice:

Open in Sigma generator →

07Related CVEs

No directly-cited follow-up CVEs in the KB record for this advisory. The references list in section 09 carries the vendor cross-references.

08Timeline

• Published: 2023-07-12T12:51:19.498Z
• Last modified: 2024-11-07T16:59:33.267Z

09References

• rockwellautomation.custhelp.com — https://rockwellautomation.custhelp.com/app/answers/answer_view/a_id/1140010