vde-2026-093
CRITICAL CVSS 9.8 csaf_sauterag
Description
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.
Timeline
- Published
- 2026-09-01 10:00 UTC
- Last Modified
- 2026-09-01
CVSS Details
CVSS details not available.
Affected Products
No product information available.
Weaknesses (CWE)
References
No references available.
Linked Vulnerabilities
No linked vulnerabilities found.
{
"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/>=1.0.0|<7.0.0",
"product": {
"name": "EY-modulo 5 embedded software version <7.0.0",
"product_id": "CSAFPID-21004",
"product_identification_helper": {
"cpe": "cpe:2.3:o:sauter:ey-modulo_5_embedded_software:*:*:*:*:*:*:*:*"
}
}
}
],
"category": "product_name",
"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/>=1.0.0|<4.0.0",
"product": {
"name": "modulo 6 embedded software version <4.0.0",
"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 <4.0.0 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 <4.0.0 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 <4.0.0 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 <7.0.0 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 <7.0.0 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"
}
]
}