Vulnerability · Published Apr 4, 2022 · Assigned by icscert

CVE-2021-32986Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or Channel

Critical 9.8

In plain English

A critical-severity authentication bypass in CLICK PLC CPU Modules: C0-1x CPUs from Automation Direct. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 1.1% (higher than 66% of all known vulnerabilities).

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)1.1%top 33.9% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Automation Direct	CLICK PLC CPU Modules: C0-1x CPUs	unspecified – before 3.00

Weakness: CWE-288 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

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