# CVE-2026-9653

## Summary

- **CVE ID:** CVE-2026-9653
- **Severity:** HIGH
- **CVSS Score:** 8.7 (CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-354
- **Published:** Jul 14, 2026
- **Last Modified:** Jul 14, 2026

## Description

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 Products

- Rockwell Automation — 1756-EN2, 1756-EN3 (12.001 and before)
- Rockwell Automation — 1756-ENBT (6.006)

## References

- [CNA](https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1780.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.23%
- **EPSS Percentile:** 14.0

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._