CVE-2026-9653Network attack vector

Connection disruption via unvalidated CIP Connection IDs

Published Jul 14, 2026 · Updated Jul 14, 2026

Denial of service in Rockwell Automation 1756-ENBT 6.006 allows remote attackers to disrupt device connections via crafted CIP packets. The packet-processing path fails to validate the Connection ID in CIP Implicit Connection packets before handling them. Network access to the module is sufficient; each interruption recovers immediately, but repeated packets can keep connections unavailable.

CVSS severity8.7
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Denial of service in Rockwell Automation 1756-ENBT 6.006 allows remote attackers to disrupt device connections via crafted CIP packets. The packet-processing path fails to validate the Connection ID in CIP Implicit Connection packets before handling them. Network access to the module is sufficient; each interruption recovers immediately, but repeated packets can keep connections unavailable.

The record

CVE
CVE-2026-9653
Published
Jul 14, 2026
Updated
Jul 14, 2026
Vendor
Rockwell Automation
Product
1756-ENBT
Classifications
CWE-354, T0814
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 14, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 14, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.006

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Rockwell Automation · 1756-ENBTversion=6.006

Published CVSS scores

7.5Rockwell AutomationCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
8.7Rockwell AutomationCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-354Improper Validation of Integrity Check Value
T0814Denial of Service

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo