Description
A security issue exists in the protected mode of 1756-EN4TR and 1756-EN2TR communication modules, where a Concurrent Forward Close operation can trigger a Major Non-Recoverable (MNFR) fault. This condition may lead to unexpected system crashes and loss of device availability.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| Rockwell Automation | 1756-ENT2R, 1756-EN4TR, 1756-EN4TRXT | Version 6.001 or Prior | — |
Advisories 1
- ICSA-25-226-31 Rockwell Automation 1756-EN4TR, 1756-EN4TRXT (Update B) CISA ICS & IT advisories · Oct 7, 2025