Vulnerability in Rockwell Automation 1756-En2, 1756-En3
CVE-2026-9653
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.
EPSS: 0.002 (13.8th percentile) — read the EPSS interpretation.
Affected products
- Rockwell Automation 1756-en2, 1756-en3 — versions 12.001 and before
- Rockwell Automation 1756-enbt — versions 6.006