{ "document": { "category": "csaf_base", "csaf_version": "2.0", "distribution": { "tlp": { "label": "WHITE" } }, "lang": "en", "notes": [ { "category": "legal_disclaimer", "text": "The Netherlands Cyber Security Center (henceforth: NCSC-NL) maintains this portal to enhance access to its information and vulnerabilities. The use of this information is subject to the following terms and conditions:\n\nThe vulnerabilities disclosed in this portal are gathered by NCSC-NL from a variety of open sources, which the user can retrieve from other platforms. NCSC-NL makes every reasonable effort to ensure that the content of this portal is kept up to date, and that it is accurate and complete. Nevertheless, NCSC-NL cannot entirely rule out the possibility of errors, and therefore cannot give any warranty in respect of its completeness, accuracy or real-time keeping up-to-date. NCSC-NL does not control nor guarantee the accuracy, relevance, timeliness or completeness of information obtained from these external sources. The vulnerabilities disclosed in this portal are intended solely for the convenience of professional parties to take appropriate measures to manage the risks posed to the cybersecurity. No rights can be derived from the information provided therein.\n\nNCSC-NL and the Kingdom of the Netherlands assume no legal liability or responsibility for any damage resulting from either the use or inability of use of the vulnerabilities disclosed in this portal. This includes damage resulting from the inaccuracy of incompleteness of the information contained in it.\nThe information on this page is subject to Dutch law. All disputes related to or arising from the use of this portal regarding the disclosure of vulnerabilities will be submitted to the competent court in The Hague. This choice of means also applies to the court in summary proceedings." } ], "publisher": { "category": "coordinator", "contact_details": "cert@ncsc.nl", "name": "National Cyber Security Centre", "namespace": "https://www.ncsc.nl/" }, "title": "CVE-2026-3611", "tracking": { "current_release_date": "2026-03-30T16:39:40.520177Z", "generator": { "date": "2026-02-17T15:00:00Z", "engine": { "name": "V.E.L.M.A", "version": "1.7" } }, "id": "CVE-2026-3611", "initial_release_date": "2026-03-11T15:54:20.758894Z", "revision_history": [ { "date": "2026-03-11T15:54:20.758894Z", "number": "1", "summary": "NCSC Score created." }, { "date": "2026-03-12T20:39:05.936116Z", "number": "2", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products created (7).| References created (3).| CWES updated (1)." }, { "date": "2026-03-12T20:39:08.540409Z", "number": "3", "summary": "NCSC Score updated." }, { "date": "2026-03-12T21:43:00.530653Z", "number": "4", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| References created (3).| CWES updated (1)." }, { "date": "2026-03-12T21:43:09.155730Z", "number": "5", "summary": "NCSC Score updated." }, { "date": "2026-03-13T14:12:30.175567Z", "number": "6", "summary": "Source created.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-13T18:39:04.640070Z", "number": "7", "summary": "Unknown change." }, { "date": "2026-03-13T20:35:53.615843Z", "number": "8", "summary": "NCSC Score updated." }, { "date": "2026-03-20T09:28:35.262506Z", "number": "9", "summary": "Source connected.| CVE status created. (valid)| EPSS created." }, { "date": "2026-03-20T09:28:38.722716Z", "number": "10", "summary": "NCSC Score updated." }, { "date": "2026-03-30T16:39:01.261573Z", "number": "11", "summary": "Source created.| CVE status created. (valid)| Description created for source.| CVSS created.| Products connected (7).| References created (3).| CWES updated (1).| Unknown change." }, { "date": "2026-03-30T16:39:04.148466Z", "number": "12", "summary": "NCSC Score updated." } ], "status": "interim", "version": "12" } }, "product_tree": { "branches": [ { "branches": [ { "branches": [ { "category": "product_version_range", "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product": { "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product_id": "CSAFPID-5810757" } } ], "category": "product_name", "name": "IQ3" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product": { "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product_id": "CSAFPID-5810753" } } ], "category": "product_name", "name": "IQ412" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product": { "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product_id": "CSAFPID-5810756" } } ], "category": "product_name", "name": "IQ41x" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product": { "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product_id": "CSAFPID-5810754" } } ], "category": "product_name", "name": "IQ422" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product": { "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product_id": "CSAFPID-5810752" } } ], "category": "product_name", "name": "IQ4E" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product": { "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product_id": "CSAFPID-5810755" } } ], "category": "product_name", "name": "IQ4NC" }, { "branches": [ { "category": "product_version_range", "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product": { "name": "vers:unknown/v3.50_3.44|<=4.36(build4.3.7.9)", "product_id": "CSAFPID-5810758" } } ], "category": "product_name", "name": "IQECO" } ], "category": "vendor", "name": "Honeywell" } ] }, "vulnerabilities": [ { "cve": "CVE-2026-3611", "cwe": { "id": "CWE-306", "name": "Missing Authentication for Critical Function" }, "notes": [ { "category": "description", "text": "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.", "title": "cveprojectv5 - https://www.cve.org/CVERecord?id=CVE-2026-3611" }, { "category": "description", "text": "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.", "title": "nvd - https://nvd.nist.gov/vuln/detail/CVE-2026-3611" }, { "category": "description", "text": "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.", "title": "cveprojectv5 - https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/3xxx/CVE-2026-3611.json" }, { "category": "other", "text": "0.00157", "title": "EPSS" }, { "category": "other", "text": "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", "title": "CVSSV4" }, { "category": "other", "text": "10.0", "title": "CVSSV4 base score" }, { "category": "other", "text": "4.3", "title": "NCSC Score" }, { "category": "other", "text": "There is cwe data available from source Nvd, The value of the most recent CVSS (V3) score", "title": "NCSC Score top decreasing factors" } ], "product_status": { "known_affected": [ "CSAFPID-5810752", "CSAFPID-5810753", "CSAFPID-5810754", "CSAFPID-5810755", "CSAFPID-5810756", "CSAFPID-5810757", "CSAFPID-5810758" ] }, "references": [ { "category": "external", "summary": "Source - cveprojectv5", "url": "https://www.cve.org/CVERecord?id=CVE-2026-3611" }, { "category": "external", "summary": "Source raw - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/3xxx/CVE-2026-3611.json" }, { "category": "external", "summary": "Source - nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-3611" }, { "category": "external", "summary": "Source raw - nvd", "url": "https://services.nvd.nist.gov/rest/json/cves/2.0?cveId=CVE-2026-3611" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-3611" }, { "category": "external", "summary": "Source raw - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - first", "url": "https://api.first.org/data/v1/epss?limit=10000&offset=0" }, { "category": "external", "summary": "Source - cveprojectv5", "url": "https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/3xxx/CVE-2026-3611.json" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://www.cisa.gov/news-events/ics-advisories/icsa-26-069-03" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-069-03.json" }, { "category": "external", "summary": "Reference - cveprojectv5; nvd", "url": "https://www.honeywell.com/us/en/contact" } ], "scores": [ { "cvss_v3": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H", "baseScore": 10.0, "baseSeverity": "CRITICAL" }, "products": [ "CSAFPID-5810752", "CSAFPID-5810753", "CSAFPID-5810754", "CSAFPID-5810755", "CSAFPID-5810756", "CSAFPID-5810757", "CSAFPID-5810758" ] } ], "title": "CVE-2026-3611" } ] }