CVE-2021-32984Network attack vector

Unauthorized project read via shared unlocked privileges

Published Apr 4, 2022 · Updated Apr 16, 2025

Authentication bypass in AutomationDirect CLICK PLC C0-1x firmware before 3.00 allows remote attackers to read PLC projects. The programming service applies the same unlocked privilege state to every concurrent programming connection instead of binding it to the authorized session. Exploitation requires an authorized user to have unlocked the controller, after which a separate network connection can retrieve the project without authentication.

CVSS severity9.8
Critical
EPSS probability1.11%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Authentication bypass in AutomationDirect CLICK PLC C0-1x firmware before 3.00 allows remote attackers to read PLC projects. The programming service applies the same unlocked privilege state to every concurrent programming connection instead of binding it to the authorized session. Exploitation requires an authorized user to have unlocked the controller, after which a separate network connection can retrieve the project without authentication.

The record

CVE
CVE-2021-32984
Published
Apr 4, 2022
Updated
Apr 16, 2025
Vendor
AutomationDirect
Product
CLICK PLC
Classifications
CWE-288, CWE-287, T0866
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 4, 2022CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=unspecified <3.00

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

AutomationDirect · CLICK PLCversion=unspecified <3.00

Published CVSS scores

9.8ICS-CERTCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
9.8NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-288Authentication Bypass Using an Alternate Path or Channel
CWE-287Improper Authentication
T0866Exploitation of Remote Services

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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