Vulnerability-Lookup

VDE-2026-093

Vulnerability from csaf_sauterag - Published: 2026-09-01 10:00 - Updated: 2026-09-01 10:00

Summary

SAUTER: modulo 6 and EY-modulo 5 Vulnerability in Firmware update mechanism allowing remote code execution

Notes

Summary: A vulnerability has been found in the firmware update process of SAUTER Building Controllers. The identified vulnerability could allow unauthorized code execution on affected controllers.

Remediation: On ecos504 (EY-RC504F***) and ecos505 (EY-RC505F***) update to firmware version 7.0.0. or newer. On modu680-AS (EY6AS80F021), modu660-AS (EY6AS60F011)) and modu612-LC (EY6LC12F011), update to firmware version 4.0.0 or newer. Contact your local SAUTER representative if you need further assistance.

Impact: An attacker who successfully exploits this vulnerability may gain full control of the device, potentially affecting the operation, reliability, and security of connected building automation functions.

CVE-2026-78319

A service running on the affected products contains a potential Time-of-Check Time-of-Use (TOCTOU) race condition. An unauthenticated remote attacker could exploit this race condition to bypass intended security controls. This may result in the execution of unauthorized code.

9.8 (Critical)


                
                  CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Mitigation Protect access to device and network according to best practices and state of the art means.

Affected products

Fixed 5 products

Product	Identifier	Version	Remediation
Unresolved product id: CSAFPID-32001		—
Unresolved product id: CSAFPID-32002		—
Unresolved product id: CSAFPID-32003		—
Unresolved product id: CSAFPID-32004		—
Unresolved product id: CSAFPID-32005		—

Known affected 5 products

Product	Version	Remediation
Unresolved product id: CSAFPID-31004	—	Vendor Fix
Unresolved product id: CSAFPID-31005	—	Vendor Fix
Unresolved product id: CSAFPID-31006	—	Vendor Fix
Unresolved product id: CSAFPID-31007	—	Vendor Fix
Unresolved product id: CSAFPID-31008	—	Vendor Fix

References

6 references

URL	Category
https://certvde.com/en/advisories/VDE-2026-093	self
https://sauter.csaf-tp.certvde.com/.well-known/cs…	self
https://www.ar.admin.ch/en/news-cyd-campus-confer…	external
https://www.sauter-controls.com/en/cybersecurity/	external
https://certvde.com/de/advisories/vendor/sauter	external
https://www.first.org/cvss/calculator/4.0#CVSS:4.…	external

Acknowledgments

CERT@VDE

Cyberdefence Campus Domotics Hackathon 2026 www.ar.admin.ch/en/news-cyd-campus-conference-2026-en

JSON

To clipboard

{
  "document": {
    "acknowledgments": [
      {
        "organization": "CERT@VDE",
        "summary": "coordination"
      },
      {
        "organization": "Cyberdefence Campus Domotics Hackathon 2026",
        "summary": "We would like to express our gratitude to the organisers of the Cyberdefence Campus Domotics Hackathon 2026 for their kind invitation to participate and for their responsible disclosure of vulnerabilities.",
        "urls": [
          "https://www.ar.admin.ch/en/news-cyd-campus-conference-2026-en"
        ]
      }
    ],
    "category": "csaf_security_advisory",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "en-GB",
    "notes": [
      {
        "category": "summary",
        "text": "A vulnerability has been found in the firmware update process of SAUTER Building Controllers. The identified vulnerability could allow unauthorized code execution on affected controllers.",
        "title": "Summary"
      },
      {
        "category": "description",
        "text": "On ecos504 (EY-RC504F***) and ecos505 (EY-RC505F***) update to firmware version 7.0.0. or newer. \n\nOn modu680-AS (EY6AS80F021), modu660-AS (EY6AS60F011)) and modu612-LC (EY6LC12F011), update to firmware version 4.0.0 or newer.\n\nContact your local SAUTER representative if you need further assistance.",
        "title": "Remediation"
      },
      {
        "category": "description",
        "text": "An attacker who successfully exploits this vulnerability may gain full control of the device, potentially affecting the operation, reliability, and security of connected building automation functions.",
        "title": "Impact"
      }
    ],
    "publisher": {
      "category": "vendor",
      "contact_details": "psirt@sautergroup.com",
      "name": "Sauter AG",
      "namespace": "https://www.sauter-controls.com"
    },
    "references": [
      {
        "category": "self",
        "summary": "VDE-2026-093: SAUTER: modulo 6 and EY-modulo 5 Vulnerability in Firmware update mechanism allowing remote code execution - HTML",
        "url": "https://certvde.com/en/advisories/VDE-2026-093"
      },
      {
        "category": "self",
        "summary": "VDE-2026-093: SAUTER: modulo 6 and EY-modulo 5 Vulnerability in Firmware update mechanism allowing remote code execution - CSAF",
        "url": "https://sauter.csaf-tp.certvde.com/.well-known/csaf/white/2026/vde-2026-093.json"
      },
      {
        "category": "external",
        "summary": "Cyberdefence Campus Domotics Hackathon 2026",
        "url": "https://www.ar.admin.ch/en/news-cyd-campus-conference-2026-en"
      },
      {
        "category": "external",
        "summary": "Sauter Cybersecurity",
        "url": "https://www.sauter-controls.com/en/cybersecurity/"
      },
      {
        "category": "external",
        "summary": "CERT@VDE Security Advisories for Sauter",
        "url": "https://certvde.com/de/advisories/vendor/sauter"
      }
    ],
    "title": "SAUTER: modulo 6 and EY-modulo 5 Vulnerability in Firmware update mechanism allowing remote code execution",
    "tracking": {
      "aliases": [
        "VDE-2026-093"
      ],
      "current_release_date": "2026-09-01T10:00:00.000Z",
      "generator": {
        "date": "2026-09-01T06:40:23.164Z",
        "engine": {
          "name": "Secvisogram",
          "version": "2.6.6"
        }
      },
      "id": "VDE-2026-093",
      "initial_release_date": "2026-09-01T10:00:00.000Z",
      "revision_history": [
        {
          "date": "2026-09-01T10:00:00.000Z",
          "number": "1.0.0",
          "summary": "Initial revision"
        }
      ],
      "status": "final",
      "version": "1.0.0"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "product_version",
                    "name": "7.0.0",
                    "product": {
                      "name": "EY-modulo 5 embedded software version 7.0.0",
                      "product_id": "CSAFPID-21003",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:o:sauter:ey-modulo_5_embedded_software:7.0.0:*:*:*:*:*:*:*"
                      }
                    }
                  },
                  {
                    "category": "product_version_range",
                    "name": "vers:semver/\u003e=1.0.0|\u003c7.0.0",
                    "product": {
                      "name": "EY-modulo 5 embedded software version \u003c7.0.0",
                      "product_id": "CSAFPID-21004",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:o:sauter:ey-modulo_5_embedded_software:*:*:*:*:*:*:*:*"
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                "name": "EY-modulo 5 embedded software"
              },
              {
                "branches": [
                  {
                    "category": "product_version",
                    "name": "4.0.0",
                    "product": {
                      "name": "modulo 6 embedded software version 4.0.0",
                      "product_id": "CSAFPID-21001",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:o:sauter:modulo_6_embedded_software:4.0.0:*:*:*:*:*:*:*"
                      }
                    }
                  },
                  {
                    "category": "product_version_range",
                    "name": "vers:semver/\u003e=1.0.0|\u003c4.0.0",
                    "product": {
                      "name": "modulo 6 embedded software version \u003c4.0.0",
                      "product_id": "CSAFPID-21002",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:o:sauter:ey-modulo_5_embedded_software:*:*:*:*:*:*:*:*"
                      }
                    }
                  }
                ],
                "category": "product_name",
                "name": "modulo 6 embedded software"
              }
            ],
            "category": "product_family",
            "name": "Firmware"
          },
          {
            "branches": [
              {
                "branches": [
                  {
                    "category": "product_name",
                    "name": "ecos504",
                    "product": {
                      "name": "EY-modulo 5 ecos504",
                      "product_id": "CSAFPID-11004",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:h:sauter:ecos504:*:*:*:*:*:*:*:*",
                        "model_numbers": [
                          "EY-RC504F***"
                        ]
                      }
                    }
                  },
                  {
                    "category": "product_name",
                    "name": "ecos505",
                    "product": {
                      "name": "EY-modulo 5 ecos505",
                      "product_id": "CSAFPID-11005",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:h:sauter:ecos505:*:*:*:*:*:*:*:*",
                        "model_numbers": [
                          "EY-RC505F***"
                        ]
                      }
                    }
                  }
                ],
                "category": "product_family",
                "name": "EY-modulo 5"
              },
              {
                "branches": [
                  {
                    "category": "product_name",
                    "name": "modu612-LC",
                    "product": {
                      "name": "modulo 6 modu612-LC",
                      "product_id": "CSAFPID-11003",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:h:sauter:modu612-lc:*:*:*:*:*:*:*:*",
                        "model_numbers": [
                          "EY6LC12F011"
                        ]
                      }
                    }
                  },
                  {
                    "category": "product_name",
                    "name": "modu660-AS",
                    "product": {
                      "name": "modulo 6 modu660-AS",
                      "product_id": "CSAFPID-11002",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:h:sauter:modu660-as:*:*:*:*:*:*:*:*",
                        "model_numbers": [
                          "EY6AS60F011"
                        ]
                      }
                    }
                  },
                  {
                    "category": "product_name",
                    "name": "modu680-AS",
                    "product": {
                      "name": "modulo 6 modu680-AS",
                      "product_id": "CSAFPID-11001",
                      "product_identification_helper": {
                        "cpe": "cpe:2.3:h:sauter:modu680-as:*:*:*:*:*:*:*:*",
                        "model_numbers": [
                          "EY6AS80F021"
                        ]
                      }
                    }
                  }
                ],
                "category": "product_family",
                "name": "modulo 6"
              }
            ],
            "category": "product_family",
            "name": "Hardware"
          }
        ],
        "category": "vendor",
        "name": "Sauter"
      }
    ],
    "product_groups": [
      {
        "group_id": "CSAFGID-0001",
        "product_ids": [
          "CSAFPID-31004",
          "CSAFPID-31005",
          "CSAFPID-31006",
          "CSAFPID-31007",
          "CSAFPID-31008"
        ],
        "summary": "Affected products."
      },
      {
        "group_id": "CSAFGID-0002",
        "product_ids": [
          "CSAFPID-32001",
          "CSAFPID-32002",
          "CSAFPID-32003",
          "CSAFPID-32004",
          "CSAFPID-32005"
        ],
        "summary": "Fixed products."
      }
    ],
    "relationships": [
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "modulo 6 embedded software version 4.0.0 installed on modulo 6 modu680-AS",
          "product_id": "CSAFPID-32001",
          "product_identification_helper": {
            "cpe": "cpe:2.3:h:sauter:modu680-as:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21001",
        "relates_to_product_reference": "CSAFPID-11001"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "modulo 6 embedded software version 4.0.0 installed on modulo 6 modu660-AS",
          "product_id": "CSAFPID-32002",
          "product_identification_helper": {
            "cpe": "cpe:2.3:h:sauter:modu660-as:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21001",
        "relates_to_product_reference": "CSAFPID-11002"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "modulo 6 embedded software version 4.0.0 installed on modulo 6 modu612-LC",
          "product_id": "CSAFPID-32003",
          "product_identification_helper": {
            "cpe": "cpe:2.3:h:sauter:modu612-lc:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21001",
        "relates_to_product_reference": "CSAFPID-11003"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "modulo 6 embedded software version \u003c4.0.0 installed on modulo 6 modu680-AS",
          "product_id": "CSAFPID-31004",
          "product_identification_helper": {
            "cpe": "cpe:2.3:h:sauter:modu680-as:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21002",
        "relates_to_product_reference": "CSAFPID-11001"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "modulo 6 embedded software version \u003c4.0.0 installed on modulo 6 modu660-AS",
          "product_id": "CSAFPID-31005",
          "product_identification_helper": {
            "cpe": "cpe:2.3:h:sauter:modu660-as:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21002",
        "relates_to_product_reference": "CSAFPID-11002"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "modulo 6 embedded software version \u003c4.0.0 installed on modulo 6 modu612-LC",
          "product_id": "CSAFPID-31006",
          "product_identification_helper": {
            "cpe": "cpe:2.3:h:sauter:modu612-lc:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21002",
        "relates_to_product_reference": "CSAFPID-11003"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "EY-modulo 5 embedded software version 7.0.0 installed on EY-modulo 5 ecos504",
          "product_id": "CSAFPID-32004",
          "product_identification_helper": {
            "cpe": "cpe:2.3:h:sauter:ecos504:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21003",
        "relates_to_product_reference": "CSAFPID-11004"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "EY-modulo 5 embedded software version 7.0.0 installed on EY-modulo 5 ecos505",
          "product_id": "CSAFPID-32005",
          "product_identification_helper": {
            "cpe": "cpe:2.3:h:sauter:ecos505:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21003",
        "relates_to_product_reference": "CSAFPID-11005"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "EY-modulo 5 embedded software version \u003c7.0.0 installed on EY-modulo 5 ecos504",
          "product_id": "CSAFPID-31007",
          "product_identification_helper": {
            "cpe": "cpe:2.3:h:sauter:ecos504:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21004",
        "relates_to_product_reference": "CSAFPID-11004"
      },
      {
        "category": "installed_on",
        "full_product_name": {
          "name": "EY-modulo 5 embedded software version \u003c7.0.0 installed on EY-modulo 5 ecos505",
          "product_id": "CSAFPID-31008",
          "product_identification_helper": {
            "cpe": "cpe:2.3:h:sauter:ecos505:*:*:*:*:*:*:*:*"
          }
        },
        "product_reference": "CSAFPID-21004",
        "relates_to_product_reference": "CSAFPID-11005"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-78319",
      "cwe": {
        "id": "CWE-367",
        "name": "Time-of-check Time-of-use (TOCTOU) Race Condition"
      },
      "notes": [
        {
          "category": "description",
          "text": "A service running on the affected products contains a potential Time-of-Check Time-of-Use (TOCTOU) race condition.\nAn unauthenticated remote attacker could exploit this race condition to bypass intended security controls.\nThis may result in the execution of unauthorized code.",
          "title": "CVE description"
        }
      ],
      "product_status": {
        "fixed": [
          "CSAFPID-32001",
          "CSAFPID-32002",
          "CSAFPID-32003",
          "CSAFPID-32004",
          "CSAFPID-32005"
        ],
        "known_affected": [
          "CSAFPID-31004",
          "CSAFPID-31005",
          "CSAFPID-31006",
          "CSAFPID-31007",
          "CSAFPID-31008"
        ]
      },
      "references": [
        {
          "category": "external",
          "summary": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N - 9.3 / Critical",
          "url": "https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"
        }
      ],
      "remediations": [
        {
          "category": "mitigation",
          "details": "Protect access to device and network according to best practices and state of the art means.",
          "group_ids": [
            "CSAFGID-0001"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update modulo 6 affected products with Firmware Version 4.0.0 or higher and enable the downgrade protection.",
          "product_ids": [
            "CSAFPID-31004",
            "CSAFPID-31005",
            "CSAFPID-31006"
          ]
        },
        {
          "category": "vendor_fix",
          "details": "Update EY-modulo 5 affected products with Firmware Version 7.0.0 or higher and enable the downgrade protection.",
          "product_ids": [
            "CSAFPID-31007",
            "CSAFPID-31008"
          ]
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "confidentialityImpact": "HIGH",
            "environmentalScore": 9.8,
            "environmentalSeverity": "CRITICAL",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "temporalScore": 9.8,
            "temporalSeverity": "CRITICAL",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "CSAFPID-31004",
            "CSAFPID-31005",
            "CSAFPID-31006",
            "CSAFPID-31007",
            "CSAFPID-31008"
          ]
        }
      ],
      "title": "TOCTOU Vulnerability in file exchange"
    }
  ]
}

CVE-2026-78319 (GCVE-0-2026-78319)

Vulnerability from cvelistv5 – Published: 2026-09-01 06:44 – Updated: 2026-09-01 17:36

Title

TOCTOU Vulnerability in file exchange

Summary

Severity

9.3 (Critical)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

SSVC

Exploitation: none Automatable: yes Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-09-01 17:36 UTC

CWE

CWE-367 - Time-of-check Time-of-use (TOCTOU) Race Condition

Assigner

CERTVDE icscert root

References

2 references

URL	Tags
https://www.certvde.com/en/advisories/VDE-2026-093/
https://sauter.csaf-tp.certvde.com/.well-known/cs…

Impacted products

5 products

Vendor	Product	Version
Sauter	modu680-AS	Affected: 1.0.0 , < 4.0.0 (semver)
Sauter	modu660-AS	Affected: 1.0.0 , < 4.0.0 (semver)
Sauter	modu612-LC	Affected: 1.0.0 , < 4.0.0 (semver)
Sauter	ecos504	Affected: 1.0.0 , < 7.0.0 (semver)
Sauter	ecos505	Affected: 1.0.0 , < 7.0.0 (semver)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-78319",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "yes"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-09-01T17:36:35.720120Z",
                "version": "2.0.3"
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          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "modu680-AS",
          "vendor": "Sauter",
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              "status": "affected",
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              "version": "1.0.0",
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        },
        {
          "defaultStatus": "unaffected",
          "product": "modu612-LC",
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            {
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              "status": "affected",
              "version": "1.0.0",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "unaffected",
          "product": "ecos504",
          "vendor": "Sauter",
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Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.