{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2026-3611", "assignerOrgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "state": "PUBLISHED", "assignerShortName": "icscert", "dateReserved": "2026-03-05T18:12:38.425Z", "datePublished": "2026-03-12T20:06:05.753Z", "dateUpdated": "2026-03-30T15:26:08.604Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "7d14cffa-0d7d-4270-9dc0-52cabd5a23a6", "shortName": "icscert", "dateUpdated": "2026-03-30T15:26:08.604Z" }, "title": "Honeywell IQ4x BMS Controller Missing authentication for critical function", "datePublic": "2026-03-10T17:00:00.000Z", "problemTypes": [ { "descriptions": [ { "lang": "en", "cweId": "CWE-306", "description": "CWE-306 Missing authentication for critical function", "type": "CWE" } ] } ], "affected": [ { "vendor": "Honeywell", "product": "IQ4E", "versions": [ { "status": "affected", "version": "v3.50_3.44", "lessThanOrEqual": "4.36 (build 4.3.7.9)", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "Honeywell", "product": "IQ412", "versions": [ { "status": "affected", "version": "v3.50_3.44", "lessThanOrEqual": "4.36 (build 4.3.7.9)", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "Honeywell", "product": "IQ422", "versions": [ { "status": "affected", "version": "v3.50_3.44", "lessThanOrEqual": "4.36 (build 4.3.7.9)", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "Honeywell", "product": "IQ4NC", "versions": [ { "status": "affected", "version": "v3.50_3.44", "lessThanOrEqual": "4.36 (build 4.3.7.9)", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "Honeywell", "product": "IQ41x", "versions": [ { "status": "affected", "version": "v3.50_3.44", "lessThanOrEqual": "4.36 (build 4.3.7.9)", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "Honeywell", "product": "IQ3", "versions": [ { "status": "affected", "version": "v3.50_3.44", "lessThanOrEqual": "4.36 (build 4.3.7.9)", "versionType": "custom" } ], "defaultStatus": "unaffected" }, { "vendor": "Honeywell", "product": "IQECO", "versions": [ { "status": "affected", "version": "v3.50_3.44", "lessThanOrEqual": "4.36 (build 4.3.7.9)", "versionType": "custom" } ], "defaultStatus": "unaffected" } ], "descriptions": [ { "lang": "en", "value": "The Honeywell IQ4x building management controller, exposes its full web-based HMI without authentication in its factory-default configuration. With no user module configured, security is disabled by design and the system operates under a System Guest (level 100) context, granting read/write privileges to any party able to reach the HTTP interface. Authentication controls are only enforced after a web user is created via U.htm, which dynamically enables the user module. Because this function is accessible prior to authentication, a remote user can create a new account with administrative read/write permissions enabling the user module and imposing authentication under attacker-controlled credentials. This action can effectively lock legitimate operators out of local and web-based configuration and administration.", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "The Honeywell IQ4x building management controller, exposes its full web-based HMI without authentication in its factory-default configuration. With no user module configured, security is disabled by design and the system operates under a System Guest (level 100) context, granting read/write privileges to any party able to reach the HTTP interface. Authentication controls are only enforced after a web user is created via U.htm, which dynamically enables the user module. Because this function is accessible prior to authentication, a remote user can create a new account with administrative read/write permissions enabling the user module and imposing authentication under attacker-controlled credentials. This action can effectively lock legitimate operators out of local and web-based configuration and administration." } ] } ], "references": [ { "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-069-03" }, { "url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-069-03.json" }, { "url": "https://www.honeywell.com/us/en/contact" } ], "metrics": [ { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV4_0": { "attackVector": "NETWORK", "attackComplexity": "LOW", "attackRequirements": "NONE", "privilegesRequired": "NONE", "userInteraction": "NONE", "vulnConfidentialityImpact": "HIGH", "subConfidentialityImpact": "HIGH", "vulnIntegrityImpact": "HIGH", "subIntegrityImpact": "HIGH", "vulnAvailabilityImpact": "HIGH", "subAvailabilityImpact": "HIGH", "exploitMaturity": "NOT_DEFINED", "Safety": "NOT_DEFINED", "Automatable": "NOT_DEFINED", "Recovery": "NOT_DEFINED", "valueDensity": "NOT_DEFINED", "vulnerabilityResponseEffort": "NOT_DEFINED", "providerUrgency": "NOT_DEFINED", "version": "4.0", "baseSeverity": "CRITICAL", "baseScore": 10, "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H" } }, { "format": "CVSS", "scenarios": [ { "lang": "en", "value": "GENERAL" } ], "cvssV3_1": { "version": "3.1", "attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "NONE", "userInteraction": "NONE", "scope": "CHANGED", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "availabilityImpact": "HIGH", "baseSeverity": "CRITICAL", "baseScore": 10, "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H" } } ], "workarounds": [ { "lang": "en", "value": "Honeywell is aware of the issue, but has not released a fix. For more \ninformation, contact Honeywell directly. \n[https://www.honeywell.com/us/en/contact](https://www.honeywell.com/us/en/contact).", "supportingMedia": [ { "type": "text/html", "base64": false, "value": "Honeywell is aware of the issue, but has not released a fix. For more \ninformation, contact Honeywell directly. \n[https://www.honeywell.com/us/en/contact](https://www.honeywell.com/us/en/contact)." } ] } ], "credits": [ { "lang": "en", "value": "Gjoko Krstic of Zero Science reported this vulnerability to Honeywell.", "type": "finder" } ], "source": { "advisory": "ICSA-26-069-03", "discovery": "EXTERNAL" }, "x_generator": { "engine": "Vulnogram 1.0.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2026-03-13T18:02:46.954644Z", "id": "CVE-2026-3611", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-03-13T18:03:02.081Z" } } ] }, "dataVersion": "5.2" }