Description
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
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Rockwell Automation | 1756-EN2, 1756-EN3 | 12.001 and before | — |
| Rockwell Automation | 1756-ENBT | 6.006 | — |
Advisories 1
- ICSA-26-197-02 Rockwell Automation 1756-EN2, 1756-EN3, and 1756-ENBT CISA ICS & IT advisories · Jul 16, 2026