CVE-2026-0646 PUBLISHED

Rockwell Automation FLEX I/O Dual-port EtherNet/IP Adapters – Multiple Vulnerabilities

Assigner: Rockwell
Reserved: 06.01.2026 Published: 16.06.2026 Updated: 16.06.2026

A denial-of-service security issue exists within the 1794-AENTR adapter due to improper memory handling of CIP protocol requests. This vulnerability can result in the adapter faulting and losing connection to its associated I/O modules, requiring a manual reset 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	FLEX I/O EtherNet/IP Adapters
Versions	Default: unaffected Version 2.012 is affected

References

https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1775.html

Problem Types

CWE-401 – Missing Release of Memory after Effective Lifetime CWE