CVE-2026-9624: Rockwell Automation Rslinx Classic

High severity, CVSS 8.7. EPSS: 0.4% chance of exploitation in the next 30 days.

A denial-of-service security issue exists within RSLinx® Classic. A crafted CIP packet can cause the RSLinx® Classic service to crash due to insufficient data length validation, requiring a  restart of the service to recover.

Affected products

• Rockwell Automation Rslinx Classic: up to and including V4.50

Published 2026-09-01. Last modified 2026-09-01.