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Status published
Critical
CVE-2021-32980
Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or Channel
Vulnerability Description
Automation Direct CLICK PLC CPU Modules: C0-1x CPUs with firmware prior to v3.00 does not protect against additional software programming connections. An attacker can connect to the PLC while an existing connection is already active.
Impact Analysis
Refer to official advisory for detailed impact metrics.
Remediation
Ensure systems are updated to the latest vendor-supplied patch levels.
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Credits & Attribution
The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:
- Irfan Ahmed and Adeen Ayub of Virginia Commonwealth University and Hyunguk Yoo of the University of New Orleans reported these vulnerabilities to Automation Direct.
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Affected Vendor
Automation Direct
View all reports →Affected Software
CLICK PLC CPU Modules: C0-1x CPUs
Vulnerable Versions:
unspecified
Timeline
Official Publish:
April 4th, 2022
Last Modified:
April 16th, 2025
Added to House:
July 21st, 2026
CVSS Vectors
V3:
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H