CVE-2021-32986: Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or Channel
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 Software
Remediation
Information
Event History
Frequently Asked Questions
What is the severity of CVE-2021-32986?
The severity of CVE-2021-32986 is critical with a score of 9.8.
How can an authorized user unlock Automation Direct CLICK PLC CPU Modules with firmware prior to v3.00?
An authorized user can unlock Automation Direct CLICK PLC CPU Modules with firmware prior to v3.00.
What happens if the programming software for Automation Direct CLICK PLC CPU Modules with firmware prior to v3.00 is interrupted?
If the programming software for Automation Direct CLICK PLC CPU Modules with firmware prior to v3.00 is interrupted, the PLC remains unlocked.
Are subsequent programming connections allowed without authorization for Automation Direct CLICK PLC CPU Modules with firmware prior to v3.00?
Yes, all subsequent programming connections are allowed without authorization for Automation Direct CLICK PLC CPU Modules with firmware prior to v3.00.
Where can I find more information about CVE-2021-32986?
You can find more information about CVE-2021-32986 at https://www.cisa.gov/uscert/ics/advisories/icsa-21-166-02.