CVE-2025-57882Network attack vector

Remote PLC denial of service via session exhaustion

Published Sep 23, 2025 · Updated Sep 23, 2025

Resource-release failure in AutomationDirect CLICK PLUS CPU firmware before 3.71 allows remote attackers to interrupt Remote PLC access. Remote PLC session handling fails to release consumed sessions, so repeated unauthenticated connections exhaust the device's available session pool. Network access to the service is sufficient; exhaustion denies new application sessions, with no reported confidentiality or integrity impact.

CVSS severity8.2
High
EPSS probability0.33%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource-release failure in AutomationDirect CLICK PLUS CPU firmware before 3.71 allows remote attackers to interrupt Remote PLC access. Remote PLC session handling fails to release consumed sessions, so repeated unauthenticated connections exhaust the device's available session pool. Network access to the service is sufficient; exhaustion denies new application sessions, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2025-57882
Published
Sep 23, 2025
Updated
Sep 23, 2025
Vendor
AutomationDirect
Product
CLICK PLUS C2-x CPU firmware
Classifications
CWE-404, T1499.003
Attack vector
network
Privileges
unauthenticated

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 privilegesunauthenticated

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

8.2ICS-CERTCVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
5.9ICS-CERTCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/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.

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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-404Improper Resource Shutdown or Release
T1499.003Application Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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