CVE-2026-12659: Rockwell Automation Flex 5000® Adapter - Denial of Service

Severity: high (CVSS 8.7 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-14 · updated 2026-10-24
Weakness: CWE-415

Description

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.

Affected products

Rockwell Automation The FLEX 5000® EtherNet/IP Adapter: version 6.011

References

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

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