CVE-2026-84235

Rockwell Automation 1756-ENBT Denial of Service Vulnerability

Published Sep 1, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
Description
A denial-of-service security issue exists in the affected product. The security issue stems from a crafted CIP packet being sent crashing the module. The device requires a restart to recover.

Remediation

Vendor Solution

Upgrade to 1756-EN2T or 1756-EN4TR

Tracking

Sign in to view the affected projects.

Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Rockwellautomation
Rockwellautomation 1756-enbt/a
Vendors & Products Rockwellautomation
Rockwellautomation 1756-enbt/a
Type Values Removed Values Added
Weaknesses CWE-20
Type Values Removed Values Added
Weaknesses CWE-20
CWE-400
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description A denial-of-service security issue exists in the affected product. The security issue stems from a crafted CIP packet being sent crashing the module. The device requires a restart to recover.
Title Rockwell Automation 1756-ENBT Denial of Service Vulnerability
First Time appeared Rockwell Automation
Rockwell Automation 1756-enbt Module
CPEs cpe:2.3:a:rockwell_automation:1756-enbt_module:all_versions:*:*:*:*:*:*:*
Vendors & Products Rockwell Automation
Rockwell Automation 1756-enbt Module
References
Metrics cvssV4_0

{'score': 8.7, '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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Rockwell
Published
Updated
Sep 1, 2026, 3:41 PM
Reserved
Sep 1, 2026, 12:56 PM
Status
Awaiting Analysis
Published
Sep 1, 2026, 1:20 PM
Modified
Sep 1, 2026, 8:50 PM