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9.2 Critical

CVE-2026-9621 A denial-of-service security issue exists within RSLinx® Classic

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

Affected products and versions

Product Affected versions Fixed in
RSLinx Classic® Versions not published

Other CVEs of RSLinx Classic®

The 4 CVEs of RSLinx Classic® →
CVE-2026-9625 A denial-of-service security issue exists within RSLinx® Classic 8.7 High CVE-2026-9624 A denial-of-service security issue exists within RSLinx® Classic 8.7 High CVE-2026-9622 A denial-of-service security issue exists within RSLinx® Classic 8.7 High
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