CVE-2021-32986

Name: CVE-2021-32986
Creator: NVD / NIST
Published: 2022-04-04T20:15:09.207+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.07%

Last modified Jun 17, 2026

CVE-2021-32986 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 1.07% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.07%

60.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Automationdirect	C0-10dd1e-D Firmware	< 3.00
Automationdirect	C0-10dd2e-D Firmware	< 3.00
Automationdirect	C0-10dre-D Firmware	< 3.00
Automationdirect	C0-10are-D Firmware	< 3.00
Automationdirect	C0-11dd1e-D Firmware	< 3.00
Automationdirect	C0-11dd2e-D Firmware	< 3.00
Automationdirect	C0-11dre-D Firmware	< 3.00
Automationdirect	C0-11are-D Firmware	< 3.00
Automationdirect	C0-12dd1e-D Firmware	< 3.00
Automationdirect	C0-12dd2e-D Firmware	< 3.00
Automationdirect	C0-12dre-D Firmware	< 3.00
Automationdirect	C0-12are-D Firmware	< 3.00
Automationdirect	C0-12dd1e-1-D Firmware	< 3.00
Automationdirect	C0-12dd2e-1-D Firmware	< 3.00
Automationdirect	C0-12dre-1-D Firmware	< 3.00
Automationdirect	C0-12are-1-D Firmware	< 3.00
Automationdirect	C0-12dd1e-2-D Firmware	< 3.00
Automationdirect	C0-12dd2e-2-D Firmware	< 3.00
Automationdirect	C0-12dre-2-D Firmware	< 3.00
Automationdirect	C0-12are-2-D Firmware	< 3.00

References

https://www.cisa.gov/uscert/ics/advisories/icsa-21-166-02Third Party Advisory, US Government Resource
https://www.cisa.gov/uscert/ics/advisories/icsa-21-166-02Third Party Advisory, US Government Resource

Timeline

Published: Apr 4, 2022
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-32986?

How severe is CVE-2021-32986?

CVE-2021-32986 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.07% probability of exploitation in the next 30 days.

How do I fix CVE-2021-32986?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-32986?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST