ADVISORY2025-07_VDE-2025-051

Vulnerability from csaf_codesysgmbh - Published: 2025-08-04 10:00 - Updated: 2025-09-01 10:00
Summary
CODESYS Control V3 - Exposed PKI folder
Severity
High
Notes
Summary: 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.
Impact: Unauthorized access to PKI files allows attackers to extract sensitive cryptographic keys and manipulate trusted certificates. This compromises system integrity, confidentiality and partially affects availability.
Remediation: 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 Update the following products to version 4.17.0.0. * 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/. 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, CODESYS GmbH strongly recommends keeping the new default.
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://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.
CVE-2025-41659

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.

8.3 (High)
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L
CWE-732 - Incorrect Permission Assignment for Critical Resource
Vendor Fix 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.
Vendor Fix Update the following products to version 4.17.0.0. * 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/. 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, CODESYS GmbH strongly recommends keeping the new default.
References
Acknowledgments
CERT@VDE certvde.com
Nozomi Networks Luca Borzacchiello
To clipboard 

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      },
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        "product_ids": [
          "CSAFPID-51006",
          "CSAFPID-51007",
          "CSAFPID-51008",
          "CSAFPID-51009",
          "CSAFPID-51010",
          "CSAFPID-51011",
          "CSAFPID-51012",
          "CSAFPID-51013",
          "CSAFPID-51014",
          "CSAFPID-51015",
          "CSAFPID-51016"
        ],
        "summary": "Affected products v4.x."
      },
      {
        "group_id": "CSAFGID-2002",
        "product_ids": [
          "CSAFPID-52006",
          "CSAFPID-52007",
          "CSAFPID-52008",
          "CSAFPID-52009",
          "CSAFPID-52010",
          "CSAFPID-52011",
          "CSAFPID-52012",
          "CSAFPID-52013",
          "CSAFPID-52014",
          "CSAFPID-52015",
          "CSAFPID-52016"
        ],
        "summary": "Fixed products v4.x."
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2025-41659",
      "cwe": {
        "id": "CWE-732",
        "name": "Incorrect Permission Assignment for Critical Resource"
      },
      "notes": [
        {
          "audience": "all",
          "category": "description",
          "text": "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.",
          "title": "Vulnerability 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",
          "CSAFPID-52016"
        ],
        "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",
          "CSAFPID-51016"
        ]
      },
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "Update the following products to version 3.5.21.20.\n* CODESYS Control RTE (SL)\n* CODESYS Control RTE (for Beckhoff CX) SL\n* CODESYS Control Win (SL)\n* CODESYS HMI (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/.\n\nFollowing 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:\n[CmpOpenSSL]\nEnforceBlacklistOnPKIDir=0\n\nHowever, we strongly recommend keeping the new default. \n",
          "group_ids": [
            "CSAFGID-2001"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update the following products to version 4.17.0.0.\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/.\n\nFollowing 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:\n[CmpOpenSSL]\nEnforceBlacklistOnPKIDir=0\n\nHowever, CODESYS GmbH strongly recommends keeping the new default.",
          "group_ids": [
            "CSAFGID-2002"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "LOW",
            "baseScore": 8.3,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "environmentalScore": 8.3,
            "environmentalSeverity": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "temporalScore": 8.3,
            "temporalSeverity": "HIGH",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:L",
            "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",
            "CSAFPID-51016"
          ]
        }
      ],
      "title": "CVE-2025-41659"
    }
  ]
}


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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.



Detection rules are retrieved from Rulezet.