Critical severity · published Apr 4, 2022
CVE-2021-32986
Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or Channel
9.8
CVSS
1.1%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Attack vector
Network
Complexity
Low
Privileges
None
User interaction
None
Confidentiality
High
Integrity
High
Availability
High
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)1.1% · higher than 66% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
CP
CLICK PLC CPU Modules: C0-1x CPUs · Automation Direct
before 3.00 · source: vendor
CF
C0-10are-d Firmware · Automationdirect
before 3.00 · source: NVD
CF
C0-10dd1e-d Firmware · Automationdirect
before 3.00 · source: NVD
CF
C0-10dd2e-d Firmware · Automationdirect
before 3.00 · source: NVD
CF
C0-10dre-d Firmware · Automationdirect
before 3.00 · source: NVD
CF
C0-11are-d Firmware · Automationdirect
before 3.00 · source: NVD
CF
C0-11dd1e-d Firmware · Automationdirect
before 3.00 · source: NVD
CF
C0-11dd2e-d Firmware · Automationdirect
before 3.00 · source: NVD
CF
C0-11dre-d Firmware · Automationdirect
before 3.00 · source: NVD
CF
C0-12are-1-d Firmware · Automationdirect
before 3.00 · source: NVD
CF
C0-12are-2-d Firmware · Automationdirect
before 3.00 · source: NVD
CF
C0-12are-d Firmware · Automationdirect
before 3.00 · source: NVD
Affected product
CP
CLICK PLC CPU Modules: C0-1x CPUs
Automation Direct
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2021-32986
CVE.org
https://www.cve.org/CVERecord?id=CVE-2021-32986
Third Party Advisory
https://www.cisa.gov/uscert/ics/advisories/icsa-21-166-02
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