ADVISORY2026-03_VDE-2026-018
Vulnerability from csaf_codesysgmbh - Published: 2026-03-24 08:00 - Updated: 2026-03-24 08:00Summary
CODESYS Control V3 - Externally-controlled format string in Auditlog
Severity
High
Notes
Summary: The CODESYS Control runtime system's CmpAuditLog component allows potentially unauthenticated remote attackers to control the format string of processed log messages. Due to the internal processing logic, the impact is limited to a crash of the CODESYS Control runtime.
Impact: Exploitation of this vulnerability can lead to a denial-of-service (DoS) condition on affected PLCs, disrupting industrial control systems.
Mitigation: As a mitigation, the Audit Log feature can be disabled in the CODESYS Control runtime configuration file. When the Audit Log logger is not enabled, the affected functionality is no longer exposed and the vulnerability cannot be exploited.
To disable the Audit Log feature, use the following settings:
[CmpLog]
Logger.0.Name=.Audit.log
Logger.0.Enable=0
Remediation: Update the following products to version 3.5.22.0.
* CODESYS Control RTE (SL)
* CODESYS Control RTE (for Beckhoff CX) SL
* CODESYS Control Win (SL)
* CODESYS Runtime Toolkit
Update the following products to version 4.21.0.0. The release of this version is expected in Q2 2026.
* CODESYS Control for BeagleBone SL
* CODESYS Control for emPC-A/iMX6 SL
* CODESYS Control for IOT2000 SL
* CODESYS Control for Linux ARM SL
* CODESYS Control for Linux SL
* CODESYS Control for PFC100 SL
* CODESYS Control for PFC200 SL
* CODESYS Control for PLCnext SL
* CODESYS Control for Raspberry Pi SL
* CODESYS Control for WAGO Touch Panels 600 SL
* CODESYS Virtual Control SL
The CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/.
General Recommendation: As part of a security strategy, CODESYS GmbH strongly recommends at least the following best-practice
defense measures:
* Use controllers and devices only in a protected environment to minimize network exposure and ensure that they are not accessible from outside
* Use firewalls to protect and separate the control system network from other networks
* Activate and apply user management and password features
* Limit the access to both development and control system by physical means, operating system features, etc.
* Use encrypted communication links
* Use VPN (Virtual Private Networks) tunnels if remote access is required
* Protect both development and control system by using up to date virus detecting solutions
For more information and general recommendations for protecting machines and plants, see also the
CODESYS Security Whitepaper [here.](https://www.customers.codesys.com/fileadmin/data/customers/security/CODESYS-Security-Whitepaper.pdf)
Disclaimer: CODESYS GmbH assumes no liability whatsoever for indirect, collateral, accidental or consequential losses
that occur by the distribution and/or use of this document or any losses in connection with the distribution and/or use of this document. All information published in this document is provided on good faith by CODESYS GmbH.
Insofar as permissible by law, however, none of this information shall establish any guarantee, commitment or
liability on the part of CODESYS GmbH.
Note: Not all CODESYS features are available in all territories. For more information on geographic restrictions,
please contact sales@codesys.com.
An unauthenticated remote attacker may be able to control the format string of messages processed by the Audit Log of the CODESYS Control runtime system, potentially resulting in a denial‑of‑service (DoS) condition.
7.5 (High)
Mitigation
As a mitigation, the Audit Log feature can be disabled in the CODESYS Control runtime configuration file. When the Audit Log logger is not enabled, the affected functionality is no longer exposed and the vulnerability cannot be exploited.
To disable the Audit Log feature, use the following settings:
[CmpLog]
Logger.0.Name=.Audit.log
Logger.0.Enable=0
Vendor Fix
Update the following products to version 3.5.22.0.
* CODESYS Control RTE (SL)
* CODESYS Control RTE (for Beckhoff CX) SL
* CODESYS Control Win (SL)
* CODESYS Runtime Toolkit
The CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/.
None Available
Update the following products to version 4.21.0.0. The release of this version is expected in Q2 2026.
* CODESYS Control for BeagleBone SL
* CODESYS Control for emPC-A/iMX6 SL
* CODESYS Control for IOT2000 SL
* CODESYS Control for Linux ARM SL
* CODESYS Control for Linux SL
* CODESYS Control for PFC100 SL
* CODESYS Control for PFC200 SL
* CODESYS Control for PLCnext SL
* CODESYS Control for Raspberry Pi SL
* CODESYS Control for WAGO Touch Panels 600 SL
* CODESYS Virtual Control SL
The CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/.
References
| URL | Category | |
|---|---|---|
Acknowledgments
CERT@VDE
www.certvde.com
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"title": "Remediation"
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"product_groups": [
{
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"product_ids": [
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"CSAFPID-51002",
"CSAFPID-51003",
"CSAFPID-51004"
],
"summary": "Affected products v3.5.x."
},
{
"group_id": "CSAFGID-2001",
"product_ids": [
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"CSAFPID-52002",
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"summary": "Fixed products v3.5.x."
},
{
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"CSAFPID-51006",
"CSAFPID-51007",
"CSAFPID-51008",
"CSAFPID-51009",
"CSAFPID-51010",
"CSAFPID-51011",
"CSAFPID-51012",
"CSAFPID-51013",
"CSAFPID-51014",
"CSAFPID-51015"
],
"summary": "Affected products v4.x."
},
{
"group_id": "CSAFGID-2002",
"product_ids": [
"CSAFPID-52005",
"CSAFPID-52006",
"CSAFPID-52007",
"CSAFPID-52008",
"CSAFPID-52009",
"CSAFPID-52010",
"CSAFPID-52011",
"CSAFPID-52012",
"CSAFPID-52013",
"CSAFPID-52014",
"CSAFPID-52015"
],
"summary": "Fixed products v4.x."
}
]
},
"vulnerabilities": [
{
"cve": "CVE-2026-3509",
"cwe": {
"id": "CWE-134",
"name": "Use of Externally-Controlled Format String"
},
"notes": [
{
"audience": "all",
"category": "description",
"text": "An unauthenticated remote attacker may be able to control the format string of messages processed by the Audit Log of the CODESYS Control runtime system, potentially resulting in a denial\u2011of\u2011service (DoS) condition.",
"title": "CVE Description"
}
],
"product_status": {
"fixed": [
"CSAFPID-52001",
"CSAFPID-52002",
"CSAFPID-52003",
"CSAFPID-52004",
"CSAFPID-52005",
"CSAFPID-52006",
"CSAFPID-52007",
"CSAFPID-52008",
"CSAFPID-52009",
"CSAFPID-52010",
"CSAFPID-52011",
"CSAFPID-52012",
"CSAFPID-52013",
"CSAFPID-52014",
"CSAFPID-52015"
],
"known_affected": [
"CSAFPID-51001",
"CSAFPID-51002",
"CSAFPID-51003",
"CSAFPID-51004",
"CSAFPID-51005",
"CSAFPID-51006",
"CSAFPID-51007",
"CSAFPID-51008",
"CSAFPID-51009",
"CSAFPID-51010",
"CSAFPID-51011",
"CSAFPID-51012",
"CSAFPID-51013",
"CSAFPID-51014",
"CSAFPID-51015"
]
},
"remediations": [
{
"category": "mitigation",
"details": "As a mitigation, the Audit Log feature can be disabled in the CODESYS Control runtime configuration file. When the Audit Log logger is not enabled, the affected functionality is no longer exposed and the vulnerability cannot be exploited.\nTo disable the Audit Log feature, use the following settings:\n[CmpLog]\nLogger.0.Name=.Audit.log\nLogger.0.Enable=0",
"group_ids": [
"CSAFGID-1001",
"CSAFGID-1002"
]
},
{
"category": "vendor_fix",
"details": "Update the following products to version 3.5.22.0.\n* CODESYS Control RTE (SL)\n* CODESYS Control RTE (for Beckhoff CX) SL\n* CODESYS Control Win (SL)\n* CODESYS Runtime Toolkit\n\nThe CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/. ",
"group_ids": [
"CSAFGID-1001"
]
},
{
"category": "none_available",
"details": "Update the following products to version 4.21.0.0. The release of this version is expected in Q2 2026. \n* CODESYS Control for BeagleBone SL\n* CODESYS Control for emPC-A/iMX6 SL\n* CODESYS Control for IOT2000 SL\n* CODESYS Control for Linux ARM SL\n* CODESYS Control for Linux SL\n* CODESYS Control for PFC100 SL\n* CODESYS Control for PFC200 SL\n* CODESYS Control for PLCnext SL\n* CODESYS Control for Raspberry Pi SL\n* CODESYS Control for WAGO Touch Panels 600 SL\n* CODESYS Virtual Control SL\n\nThe CODESYS Development System and the products available as CODESYS add-ons can be downloaded and installed directly with the CODESYS Installer or be downloaded from the CODESYS Store. Alternatively, as well as for all other products, you will find further information on obtaining the software update in the CODESYS Update area https://www.codesys.com/download/. ",
"group_ids": [
"CSAFGID-1002"
]
}
],
"scores": [
{
"cvss_v3": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "HIGH",
"baseScore": 7.5,
"baseSeverity": "HIGH",
"confidentialityImpact": "NONE",
"environmentalScore": 7.5,
"environmentalSeverity": "HIGH",
"integrityImpact": "NONE",
"privilegesRequired": "NONE",
"scope": "UNCHANGED",
"temporalScore": 7.5,
"temporalSeverity": "HIGH",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"products": [
"CSAFPID-51001",
"CSAFPID-51002",
"CSAFPID-51003",
"CSAFPID-51004",
"CSAFPID-51005",
"CSAFPID-51006",
"CSAFPID-51007",
"CSAFPID-51008",
"CSAFPID-51009",
"CSAFPID-51010",
"CSAFPID-51011",
"CSAFPID-51012",
"CSAFPID-51013",
"CSAFPID-51014",
"CSAFPID-51015"
]
}
],
"title": "CODESYS Control Audit Log Format String DoS"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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