CVE-2026-9653: Rockwell Automation 1756-EN2, 1756-EN3

High severity, CVSS 8.7. EPSS: 0.2% chance of exploitation in the next 30 days.

A denial-of-service security issue exists across all the 1756-EN2, EN3, and ENBT communication module due to improper validation of CIP Implicit Connection packets. An attacker on the network can exploit this by sending crafted packets to continuously disrupt device connections, though device connections will recover immediately after.

Affected products

• Rockwell Automation 1756-EN2, 1756-EN3: up to and including 12.001
• Rockwell Automation 1756-Enbt: version 6.006 only

Published 2026-07-14. Last modified 2026-07-14.