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CVE-2026-9621

RSLinx Classic® - Multiple Vulnerabilities

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

CVSS 4.0 · 9.2 Critical EPSS < 1% KEV · Not listed
Vendors
Rockwell Automation Rockwellautomation
Products
Rslinx Classic Rslinx Classic
CVE-2026-9624

RSLinx Classic® - Multiple Vulnerabilities

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.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Rockwell Automation Rockwellautomation
Products
Rslinx Classic Rslinx Classic
CVE-2026-9625

RSLinx Classic® - Multiple Vulnerabilities

A denial-of-service security issue exists within RSLinx® Classic. A crafted CIP packet with an oversized embedded message request can cause the RSLinx® Classic service to crash, requiring a restart of the service to recover.

CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Vendors
Rockwell Automation Rockwellautomation
Products
Rslinx Classic Rslinx Classic