Denial-of-Service Vulnerability in RSLinx® Classic by Rockwell Automation
CVE-2026-9622

8.7HIGH

Key Information:

Vendor

Rockwell Automation
Status
Rslinx Classic®
Vendor
CVE Published:
1 September 2026

What is CVE-2026-9622?

A denial-of-service issue has been identified in RSLinx® Classic that can be triggered by sending a specially crafted CIP packet to the Forward Close service. This attack can lead to the RSLinx® Classic service crashing, necessitating a manual restart to restore functionality. Users are encouraged to take precautions to mitigate this risk.

Affected Version(s)

RSLinx Classic® V4.50 and prior

References

https://www.rockwellautomation.com/en-us/trust-center/sec...

CVSS V4

Score:
8.7
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.