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01 Record

CVE-2021-32986

Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or Channel

CriticalPUBLISHEDCNA: icscert
CNA base score9.8 CVSS v3.xCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

02 Description

Automation Direct CLICK PLC CPU Modules Authentication Bypass Using an Alternate Path or Channel

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
1.11% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 65.6% of scored records. A rank, not a probability.
NVD base score
9.8 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
NVD analysis status
Modified. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2022-04-04 19:45Z4 YR AGO
Last updated
2025-04-16 16:31Z1 YR AGO
Reserved
2021-05-13
Assigning CNA
icscert
Record state
PUBLISHED
Severity
Critical (CVSS 9.8)
CNA CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weaknesses
  • CWE-288Authentication Bypass Using an Alternate Path or ChannelBase
  • CWE-863Incorrect AuthorizationClass
Data version
5.1
Document digest
eafe1c951d63334577926b29db7181777bbd813c48e79996bc8e779bf26aed7d

05 Affected products

VendorProductVersionsPlatforms
Automation DirectCLICK PLC CPU Modules: C0-1x CPUs< 3.00—

06 References

07 Remediation

Automation Direct reports these vulnerabilities are all mitigated by Version 3.00 and recommends users update software and firmware to the latest version. Automation Direct also recommends users follow its security guidelines.