CVE-2026-9653

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.

Score

CVSS 4.0 8.7 High

Status

Awaiting Analysis - PSIRT@rockwellautomation.com

Published

2026-07-14

Last modified

2026-07-14

Weaknesses

CWE-354

Affected products

• 1756-en2 (Rockwell Automation)
• 1756-en3 (Rockwell Automation)
• 1756-enbt (Rockwell Automation)

References

• https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1780.html