CVE-2021-32986

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

State: Published
Severity: 9.8 Critical
Published: Apr 4, 2022
Updated: Apr 16, 2025
Reserved: May 13, 2021

Description

After Automation Direct CLICK PLC CPU Modules: C0-1x CPUs with firmware prior to v3.00 is unlocked by an authorized user, the unlocked state does not timeout. If the programming software is interrupted, the PLC remains unlocked. All subsequent programming connections are allowed without authorization. The PLC is only relocked by a power cycle, or when the programming software disconnects correctly.

Scores

CVSS	Score	Vector	Source
3.1	9.8 Critical	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H	icscert

Weaknesses

CWE-288 Authentication Bypass Using an Alternate Path or Channel

Affected Products

Product	Versions
CLICK PLC CPU Modules: C0-1x CPUsAutomation Direct	before 3.00Affected

References

https://www.cisa.gov/uscert/ics/advisories/icsa-21-166-02

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