CVE-2025-41659
highpriority · track · 0EPSS 0.002 · 12 %ileCHDEEURUUSEPSS · scored 2026-10-22
A low-privileged attacker can remotely access the PKI folder of the CODESYS Control runtime system and thus read and write certificates and its keys. This allows sensitive data to be extracted or to accept certificates as trusted. Although all services remain available, only unencrypted communication is possible if the certificates are deleted.
remediations
Vendor fix, mitigation, or workaround guidance, as published by each source.
A vendor fix is available.
- FixedAC500 V3abb_psirt
The problem is corrected in the following product versions: - AC500 V3 firmware version 3.9.0 ABB recommends that customers apply the update at earliest convenience. This firmware version is released for all AC500 V3 PLC types and available from Automation Builder 2.9.0. Automation Builder 2.9.0 is available for download from the related download site. https://www.abb.com/global/en/areas/motion/digital-tools/automation-builder/software-download
- Fixedcodesys_psirt
Update the following products to version 3.5.21.20. * CODESYS Control RTE (SL) * CODESYS Control RTE (for Beckhoff CX) SL * CODESYS Control Win (SL) * CODESYS HMI (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/. Following our general recommendation that the PKI should only be managed via the dedicated X.509 API or the corresponding online services of the CODESYS Control runtime system, the programmatic direct access via SysFile or SysDir operations or online access via the CODESYS file transfer services is denied after an update to a fixed product version. For compatibility reasons, the old behavior can be restored for applications that use these accesses via the following setting: [CmpOpenSSL] EnforceBlacklistOnPKIDir=0 However, we strongly recommend keeping the new default.
- FixedFirmware 3.1 installed on CR3171ifm_psirt
will be fixed in Firmware Version 3.3
https://www.ifm.com/de/en/product/CR3171#documents - FixedFirmware 3.2 installed on CR3171ifm_psirt
will be fixed in Firmware Version 3.3
https://www.ifm.com/de/en/product/CR3171#documents - FixedCOMBIVIS Control Runtimekeb_psirt
Update the COMBIVIS Control Runtime service to version 2.1.0.
- FixedAC500 V3cisa_csaf_ot
The problem is corrected in the following product versions: - AC500 V3 firmware version 3.9.0 ABB recommends that customers apply the update at earliest convenience. This firmware version is released for all AC500 V3 PLC types and available from Automation Builder 2.9.0. Automation Builder 2.9.0 is available for download from the related download site. https://www.abb.com/global/en/areas/motion/digital-tools/automation-builder/software-download
- MitigationAC500 V3abb_psirt
Refer to section “General security recommendations” for further advise on how to keep your system secure.
- MitigationFesto Automation Suite <2.8.0.138 installed with CODESYS Development System 3.0festo_psirt
Starting from Festo Automation Suite version 2.8.0.138, Codesys is no longer bundled with the suite and must be downloaded and installed separately by the customer. To mitigate this vulnerability customers are advised to: Download the latest, patched version of Codesys directly from the official Codesys website. Follow the installation and update instructions provided by Codesys to ensure all security fixes are applied. Regularly monitor Codesys security advisories and apply updates promptly. Maintain the Festo Automation Suite connector up to date by installing FAS updates as released by Festo.
- MitigationFesto Automation Suite <2.8.0.138 installed with CODESYS Development System 3.5.16.10festo_psirt
Starting from Festo Automation Suite version 2.8.0.138, Codesys is no longer bundled with the suite and must be downloaded and installed separately by the customer. To mitigate this vulnerability customers are advised to: Download the latest, patched version of Codesys directly from the official Codesys website. Follow the installation and update instructions provided by Codesys to ensure all security fixes are applied. Regularly monitor Codesys security advisories and apply updates promptly. Maintain the Festo Automation Suite connector up to date by installing FAS updates as released by Festo.
- MitigationFirmware 3.1 installed on CR3171ifm_psirt
deactivate CodeSys enviroment on device
- MitigationFirmware 3.2 installed on CR3171ifm_psirt
deactivate CodeSys enviroment on device
- MitigationFesto Automation Suite <2.8.0.138 installed with CODESYS Development System 3.0cisa_csaf_ot
Starting from Festo Automation Suite version 2.8.0.138, Codesys is no longer bundled with the suite and must be downloaded and installed separately by the customer. To mitigate this vulnerability customers are advised to: Download the latest, patched version of Codesys directly from the official Codesys website. Follow the installation and update instructions provided by Codesys to ensure all security fixes are applied. Regularly monitor Codesys security advisories and apply updates promptly. Maintain the Festo Automation Suite connector up to date by installing FAS updates as released by Festo.
- MitigationFesto Automation Suite <2.8.0.138 installed with CODESYS Development System 3.5.16.10cisa_csaf_ot
Starting from Festo Automation Suite version 2.8.0.138, Codesys is no longer bundled with the suite and must be downloaded and installed separately by the customer. To mitigate this vulnerability customers are advised to: Download the latest, patched version of Codesys directly from the official Codesys website. Follow the installation and update instructions provided by Codesys to ensure all security fixes are applied. Regularly monitor Codesys security advisories and apply updates promptly. Maintain the Festo Automation Suite connector up to date by installing FAS updates as released by Festo.
- MitigationAC500 V3cisa_csaf_ot
Refer to section “General security recommendations” for further advise on how to keep your system secure.
- WorkaroundAC500 V3abb_psirt
No workarounds are available
- WorkaroundAC500 V3cisa_csaf_ot
No workarounds are available
cvss
Technical severity, 0–10. One row per scoring source.
base score 0–10 · higher = more severe · hover a vector to decode
ssvc
A stakeholder decision — act, attend, or track — from exploitation and impact.
weaknesses
The CWE weakness classes this flaw belongs to.
affected products (87)
Products and version ranges known to be affected.
- CODESYS Development System 3.5.21.20 external component of Festo Automation Suite 2.8.0.138all versionsfixedcisa_csaf_otUScpe:2.3:a:codesys:development_system:3.5.21.20*:*:*:*:*:*:*:*
- Festo Automation Suite <2.8.0.138 installed with CODESYS Development System 3.0all versionscisa_csaf_otUScpe:2.3:a:codesys:development_system:3.0:*:*:*:*:*:*:*
- Festo Automation Suite <2.8.0.138 installed with CODESYS Development System 3.5.16.10all versionscisa_csaf_otUScpe:2.3:a:codesys:development_system:3.5.16.10:*:*:*:*:*:*:*
advisories (8)
Vendor and ecosystem advisories describing this.
- 3ADR011524AC500 V3 Multiple vulnerabilities2026-02-24csaf · abb_psirtCH
ABB became aware of severe vulnerability in the products versions listed as affected in the advisory. An update is available that resolves these vulnerabilities. An attacker who successfully exploited these vulnerabilities could bypass the user management and read visualization files (CVE-2025-2595), read and write certificates and keys (CVE-2025-41659) or cause a denial-of-service (DoS) (CVE-2025-41691).
- Advisory2025-07_VDE-2025-051CODESYS Control V3 - Exposed PKI folder2025-08-04csaf · codesys_psirtDE
A vulnerability in the CODESYS Control runtime system allows low-privileged remote attackers to access the PKI folder via CODESYS protocol, enabling them to read and write certificates and keys. This exposes sensitive cryptographic data and allows unauthorized certificates to be trusted. However, all services remain available, only certificate based encryption and signing features are concerned. The issue affects systems using the optional CmpOpenSSL component for cryptographic operations. **Update 1.1.0, 01.09.2025:** Updated remediation category - fixed SL runtimes are now available.
- FSA-202601Several CODESYS vulnerabilities in Festo Automation Suite2026-02-26csaf · festo_psirtDE
Starting with Festo Automation Suite (FAS) version 2.8.0.138, the suite is delivered only with a connector to Codesys, rather than including Codesys directly. Prior to this version, Codesys was bundled within the FAS installation. From version 2.8.0.138 onwards, customers are required to download and install Codesys independently. This change impacts the handling of security vulnerabilities (CVEs) related to Codesys. Any Codesys-related security issues must now be addressed by the customer through their separate Codesys installation. The FAS itself includes only the connector component, which is maintained and updated within the suite. Please ensure that Codesys is kept up to date independently to mitigate any potential security risks associated with the Codesys software.
- VDE-2026-005ifm: Multiple Vulnerabilities in CR31712026-05-06csaf · ifm_psirtDE
The Firmware installed on the CR3171 is impacted by various CODESYS vulnerabilities.
- VDE-2026-105KEB Automation: Multiple Vulnerabilities in COMBIVIS Control Runtime2026-10-08csaf · keb_psirtDE
The Docker-based COMBIVIS Control Runtime service is affected by several vulnerabilities in CODESYS Runtime Toolkit 3.5.21.10. These vulnerabilities are resolved in COMBIVIS Control Runtime 2.1.0.
- WID-SEC-W-2025-1705CODESYS: Mehrere SchwachstellenDeutsch2025-08-03csaf · cert_bundDE
Ein Angreifer kann mehrere Schwachstellen in CODESYS ausnutzen, um einen Denial-of-Service-Zustand auszulösen, Daten zu manipulieren und vertrauliche Informationen preiszugeben.
- ICSA-26-076-01CODESYS in Festo Automation Suite2026-02-26icsa · cisa_csaf_otUS
Starting with Festo Automation Suite (FAS) version 2.8.0.138, the suite is delivered only with a connector to Codesys, rather than including Codesys directly. Prior to this version, Codesys was bundled within the FAS installation. From version 2.8.0.138 onwards, customers are required to download and install Codesys independently. This change impacts the handling of security vulnerabilities (CVEs) related to Codesys. Any Codesys-related security issues must now be addressed by the customer through their separate Codesys installation. The FAS itself includes only the connector component, which is maintained and updated within the suite. Please ensure that Codesys is kept up to date independently to mitigate any potential security risks associated with the Codesys software.
- ICSA-26-132-03ABB AC500 V3 Multiple Vulnerabilities2026-02-24icsa · cisa_csaf_otUS
ABB became aware of severe vulnerability in the products versions listed as affected in the advisory. An update is available that resolves these vulnerabilities. An attacker who successfully exploited these vulnerabilities could bypass the user management and read visualization files (CVE-2025-2595), read and write certificates and keys (CVE-2025-41659) or cause a denial-of-service (DoS) (CVE-2025-41691).
also known as (4)
Other names and identifiers for this entity.
sources
Which sources assert this record, and when.
references (5)
External citations — patches, advisories, analysis.
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