CVE-2025-41738Network attack vector

Unauthenticated PLC interruption via type-confused read

Published Dec 1, 2025 · Updated Dec 1, 2025

Type confusion in CmpVisuServer in CODESYS Control before 3.5.21.40 or 4.19.0.0 allows remote attackers to interrupt affected PLCs. A crafted Web Visu or remote Target Visu request makes an internal read access a resource through a pointer of the wrong type. No authentication or user interaction is required; Web Visu exposure requires the web server to be running, which by default occurs only when PLC application code includes a visualization.

CVSS severity7.5
High
EPSS probability0.39%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Type confusion in CmpVisuServer in CODESYS Control before 3.5.21.40 or 4.19.0.0 allows remote attackers to interrupt affected PLCs. A crafted Web Visu or remote Target Visu request makes an internal read access a resource through a pointer of the wrong type. No authentication or user interaction is required; Web Visu exposure requires the web server to be running, which by default occurs only when PLC application code includes a visualization.

The record

CVE
CVE-2025-41738
Published
Dec 1, 2025
Updated
Dec 1, 2025
Vendor
CODESYS GmbH
Product
CODESYS Remote Target Visu
Classifications
CWE-843, T1499
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 1, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 1, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=3.5.18.0 <3.5.21.40

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

CODESYS GmbH · CODESYS Remote Target Visuversion=3.5.18.0 <3.5.21.40
CODESYS GmbH · CODESYS Control for BeagleBone SLversion=4.5.0.0 <4.19.0.0
CODESYS GmbH · CODESYS Control for IOT2000 SLversion=4.5.0.0 <4.19.0.0
CODESYS GmbH · CODESYS Runtime Toolkitversion=3.5.18.0 <3.5.21.40
CODESYS GmbH · CODESYS Control Win SLversion=3.5.18.0 <3.5.21.40
CODESYS GmbH · CODESYS Control for emPC-A/iMX6 SLversion=4.5.0.0 <4.19.0.0
CODESYS GmbH · CODESYS Control for Linux SLversion=4.5.0.0 <4.19.0.0
CODESYS GmbH · CODESYS Control for Linux ARM SLversion=4.5.0.0 <4.19.0.0
CODESYS GmbH · CODESYS HMI SLversion=3.5.18.0 <3.5.21.40
CODESYS GmbH · CODESYS Virtual Control SLversion=4.5.0.0 <4.19.0.0
CODESYS GmbH · CODESYS Control for PFC100 SLversion=4.5.0.0 <4.19.0.0
CODESYS GmbH · CODESYS Control for WAGO Touch Panels 600 SLversion=4.5.0.0 <4.19.0.0
CODESYS GmbH · CODESYS Control for PFC200 SLversion=4.5.0.0 <4.19.0.0
CODESYS GmbH · CODESYS Control for PLCnext SLversion=4.5.0.0 <4.19.0.0
CODESYS GmbH · CODESYS Control RTE SLversion=3.5.18.0 <3.5.21.40
CODESYS GmbH · CODESYS Control RTE (for Beckhoff CX) SLversion=3.5.18.0 <3.5.21.40
CODESYS GmbH · CODESYS Control for Raspberry Pi SLversion=4.5.0.0 <4.19.0.0

Published CVSS scores

7.5CERT@VDECVSS:3.1/AV:N/AC:L/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.

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

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-843Access of Resource Using Incompatible Type ('Type Confusion')
T1499Endpoint Denial of Service

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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