CVE-2026-12659 PUBLISHED

Rockwell Automation Flex 5000® Adapter - Denial of Service

Assigner: Rockwell
Reserved: 18.06.2026 Published: 14.07.2026 Updated: 14.07.2026

A denial-of-service security issue exists in the affected products. The security issue stems from improper handling of exceptional conditions when processing crafted CIP packets sent to the adapter. A power cycle is required to recover the module and associated I/O.

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	The FLEX 5000® EtherNet/IP Adapter
Versions	Default: unaffected Version version 6.011 is affected

Solutions

Upgrade to version 6.012 or later.

References

https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1789.html

Problem Types

CWE-415 Double free CWE