CVE-2026-9653: 1756-EN2, 1756-EN3, and 1756-ENBT - Denial of Service via CIP Connection ID
A denial-of-service security issue exists across all the 1756-EN2, EN3, and ENBT communication module due to improper validation of CIP Implicit Connection packets. An attacker on the network can exploit this by sending crafted packets to continuously disrupt device connections, though device connections will recover immediately after.
Affected Software
Event History
Frequently Asked Questions
What is the severity of CVE-2026-9653?
CVE-2026-9653 has a high severity rating of 8.7.
How does CVE-2026-9653 affect devices?
CVE-2026-9653 affects the 1756-EN2, 1756-EN3, and 1756-ENBT communication modules by allowing an attacker to cause a denial of service.
What is the risk associated with CVE-2026-9653?
CVE-2026-9653 has a risk score of 33, indicating a significant potential impact on affected systems.
How can I mitigate the vulnerability CVE-2026-9653?
To mitigate CVE-2026-9653, isolate affected devices from the network and implement network security measures to block unauthorized packet transmissions.
Who is impacted by CVE-2026-9653?
Organizations using Rockwell Automation 1756-EN2, 1756-EN3, and 1756-ENBT devices are impacted by CVE-2026-9653.