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CVE-2026-9653

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

Published: Jul 14, 2026Updated: Jul 14, 2026 Sources: CVE List NVD csafCWE-354
7.5HIGH
NVD MITRE
EPSS Score
0.2%
Top 92.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
Not available

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-354

Affected Products

Rockwell Automation
commercial·USaka arena®, arena simulation, armorstart st
1756-EN2, 1756-EN3On-prem
ICS / OT / IoT / plc-scada-hmi
1756-ENBTOn-prem
ICS / OT / IoT / plc-scada-hmi

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-9653?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://www.rockwellautomation.com/en-us/trust-center/security-advisories/advisory.SD1780.html
rockwellautomation.com
https://raw.githubusercontent.com/cisagov/CSAF/develop/csaf_files/OT/white/2026/icsa-26-197-02.json
raw.githubusercontent.com
https://www.cisa.gov/news-events/ics-advisories/icsa-26-197-02
cisa.gov
and 15 more references View all →

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