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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- None
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
What each source reports
CVE List Score used
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.
- Record
CVE-2021-32986- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-288
- Updated
- 2026-11-02
EUVDEUVD-2021-19707
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.
- Record
EUVD-2021-19707- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Updated
- 2026-11-02
GitHub AdvisoriesGHSA-j37w-8jcg-6mcp
After Automation Direct CLICK PLC CPU Modules: C0-1x CPUs with firmware prior to v3.00 is...
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.
- Record
GHSA-j37w-8jcg-6mcp- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - Weakness
- CWE-287, CWE-863
- Updated
- 2026-11-02
NVD
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.
- Record
CVE-2021-32986- CVSS 3.1
- 9.8 Critical
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H - CVSS 2.0
- 7.5 High
AV:N/AC:L/Au:N/C:P/I:P/A:P - Weakness
- CWE-288, CWE-863
- Updated
- 2026-11-02
Affected products
- automation direct click plc cpu modules: c0-1x cpus
- automationdirect c0-10are-d firmware
- automationdirect c0-10dd1e-d firmware
- automationdirect c0-10dd2e-d firmware
- automationdirect c0-10dre-d firmware
- automationdirect c0-11are-d firmware
- automationdirect c0-11dd1e-d firmware
- automationdirect c0-11dd2e-d firmware
- automationdirect c0-11dre-d firmware
- automationdirect c0-12are-1-d firmware
- automationdirect c0-12are-2-d firmware
- automationdirect c0-12are-d firmware
Show 9 moreShow less
- automationdirect c0-12dd1e-1-d firmware
- automationdirect c0-12dd1e-2-d firmware
- automationdirect c0-12dd1e-d firmware
- automationdirect c0-12dd2e-1-d firmware
- automationdirect c0-12dd2e-2-d firmware
- automationdirect c0-12dd2e-d firmware
- automationdirect c0-12dre-1-d firmware
- automationdirect c0-12dre-2-d firmware
- automationdirect c0-12dre-d firmware
History
| Recorded | Changed | Sources |
|---|---|---|
| first indexed | CVE List, EUVD, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-32986 is a critical vulnerability (CVSS 9.8) in Automation Direct Click Plc Cpu Modules: C0-1x Cpus, published April 4, 2022. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 1.11%, the 66th percentile. No source names a fixed version.