CVE-2026-84235 PUBLISHED

Rockwell Automation 1756-ENBT Denial of Service Vulnerability

Assigner: Rockwell
Reserved: 01.09.2026 Published: 01.09.2026 Updated: 01.09.2026

A denial-of-service security issue exists in the affected product. The security issue stems from a crafted CIP packet being sent crashing the module. The device requires a restart to recover.

Metrics

CVSS 4.0

CVSS Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
CVSS Score: 8.7

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	None	Integrity	None
Attack Requirements	None	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	Rockwell Automation
Product	1756-ENBT Module
Versions	Default: unaffected Version All versions is affected

Solutions

Upgrade to 1756-EN2T or

1756-EN4TR

References

https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1798.html