CVE-2025-55038Network attack vector

Unauthorized PLC variable access via KOPR

Published Sep 23, 2025 · Updated Sep 23, 2025

Missing authorization in AutomationDirect CLICK firmware before 3.71 allows remote authenticated users to read and modify PLC variables. The KOPR handler used by the Remote PLC application fails to enforce each account's configured register permissions when processing variable operations. A valid low-permission account and network access to Remote PLC are required; exploitation exposes or alters PLC process values but does not report service interruption.

CVSS severity7.6
High
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in AutomationDirect CLICK firmware before 3.71 allows remote authenticated users to read and modify PLC variables. The KOPR handler used by the Remote PLC application fails to enforce each account's configured register permissions when processing variable operations. A valid low-permission account and network access to Remote PLC are required; exploitation exposes or alters PLC process values but does not report service interruption.

The record

CVE
CVE-2025-55038
Published
Sep 23, 2025
Updated
Sep 23, 2025
Vendor
AutomationDirect
Product
CLICK PLUS C2-x CPU firmware
Classifications
CWE-862, T0836
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 23, 2025CVE publishedPublication date reported by the CVE source.
  2. Sep 23, 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=0 <v3.71

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

AutomationDirect · CLICK PLUS C2-x CPU firmwareversion=0 <v3.71
AutomationDirect · CLICK PLUS C0-1x CPU firmwareversion=0 <v3.71
AutomationDirect · CLICK PLUS C0-0x CPU firmwareversion=0 <v3.71

Published CVSS scores

7.6ICS-CERTCVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
6.8ICS-CERTCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:N

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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-862Missing Authorization
T0836Modify Parameter

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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