Critical severityNVD Advisory· Published Sep 1, 2026· Updated Sep 1, 2026

CVE-2026-9621

Description

A denial-of-service security issue exists within RSLinx® Classic. The security issue stems from improper handling of a malformed packet. A crafted CIP packet can cause the RSLinx® Classic service to crash, requiring a restart of the service to recover

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Patches

Vulnerability mechanics

References

www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1794.htmlnvd

News mentions

Rockwell Automation RSLinx Classic
CISA ICS Advisories

cvss	0.585
epss	0.000
exploit	0.000
kev	0.000
patch	0.000
ransomware	0.000