Vulnerabilities CVE-2026-9653

CVE-2026-9653

High

Open

TLP:CLEAR

1756-EN2, 1756-EN3, and 1756-ENBT - Denial of Service via CIP Connection ID

NVD CVE.org

Ransomware DDoS

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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.

Details

CVSS Score: 8.7
EPSS Score ⓘ: 0.18%

7.6th percentile
CVSS Vector: 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
Confidence: 90%
Published: Jul 14, 2026
Last Modified: Jul 14, 2026

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