CVE-2021-32984 - CVE House
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Status published Critical CVE-2021-32984

Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or Channel

Vulnerability Description

All programming connections receive the same unlocked privileges, which can result in a privilege escalation. During the time Automation Direct CLICK PLC CPU Modules: C0-1x CPUs with firmware prior to v3.00 is unlocked by an authorized user, an attacker can connect to the PLC and read the project without authorization.

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.

Affected Vendor

Automation Direct

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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

Weaknesses (CWE)