[{"data":1,"prerenderedAt":-1},["ShallowReactive",2],{"$flGy2-ws2YBLeRja870h9A80xwB2nKCUllKmo4su4L4I":3},{"article":4,"iocs":30,"watch_terms":35},{"id":5,"title":6,"slug":7,"summary":8,"ai_summary":9,"brief":10,"full_text":10,"url":11,"image_url":10,"published_at":12,"ingested_at":13,"relevance_score":10,"entities":14,"category_id":15,"category":16,"article_tags":19},"88be672a-f61c-48c4-9341-6d0673a80020","Honeywell IQ4x BMS Controller","honeywell-iq4x-bms-controller","View CSAF Summary Successful exploitation of this vulnerability could allow an unauthorized attacker to access controller management settings, control components, disclose information, or cause a denial-of-service condition. The following versions of Honeywell IQ4x BMS Controller are affected: IQ4E >=Firmware_v3.50_3.44| =Firmware_v3.50_3.44| =Firmware_v3.50_3.44| =Firmware_v3.50_3.44| =Firmware_v3.50_3.44| =Firmware_v3.50_3.44| =Firmware_v3.50_3.44| =Firmware_v3.50_3.44| =Firmware_v3.50_3.44| =Firmware_v3.50_3.44| =Firmware_v3.50_3.44| =Firmware_v3.50_3.44| =Firmware_v3.50_3.44| =Firmware_v3.50_3.44|\u003C4.36_build_4.3.7.9 Product Status: known_affected Remediations Mitigation Honeywell is aware of the issue, but has not released a fix. For more information, contact Honeywell directly. https:\u002F\u002Fwww.honeywell.com\u002Fus\u002Fen\u002Fcontact. Relevant CWE: CWE-306 Missing Authentication for Critical Function Metrics CVSS Version Base Score Base Severity Vector String 3.1 10 CRITICAL CVSS:3.1\u002FAV:N\u002FAC:L\u002FPR:N\u002FUI:N\u002FS:C\u002FC:H\u002FI:H\u002FA:H Acknowledgments Gjoko Krstic of Zero Science reported this vulnerability to Honeywell Legal Notice and Terms of Use This product is provided subject to this Notification (https:\u002F\u002Fwww.cisa.gov\u002Fnotification) and this Privacy & Use policy (https:\u002F\u002Fwww.cisa.gov\u002Fprivacy-policy). Recommended Practices CISA recommends users take defensive measures to minimize the risk of exploitation of this vulnerability, such as: Minimize network exposure for all control system devices and\u002For systems, ensuring they are not accessible from the internet. Locate control system networks and remote devices behind firewalls and isolating them from business networks. When remote access is required, use more secure methods, such as Virtual Private Networks (VPNs), recognizing VPNs may have vulnerabilities and should be updated to the most current version available. Also recognize VPN is only as secure as the connected devices. CISA reminds organizations to perform proper impact analysis and risk assessment prior to deploying defensive measures. CISA also provides a section for control systems security recommended practices on the ICS webpage on cisa.gov\u002Fics. Several CISA products detailing cyber defense best practices are available for reading and download, including Improving Industrial Control Systems Cybersecurity with Defense-in-Depth Strategies. CISA encourages organizations to implement recommended cybersecurity strategies for proactive defense of ICS assets. Additional mitigation guidance and recommended practices are publicly available on the ICS webpage at cisa.gov\u002Fics in the technical information paper, ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation Strategies. Organizations observing suspected malicious activity should follow established internal procedures and report findings to CISA for tracking and correlation against other incidents. CISA also recommends users take the following measures to protect themselves from social engineering attacks: Do not click web links or open attachments in unsolicited email messages. Refer to Recognizing and Avoiding Email Scams for more information on avoiding email scams. Refer to Avoiding Social Engineering and Phishing Attacks for more information on social engineering attacks. No known public exploitation specifically targeting this vulnerability has been reported to CISA at this time. Revision History Initial Release Date: 2026-03-10 Date Revision Summary 2026-03-10 1 Initial Publication Legal Notice and Terms of Use","A critical authentication vulnerability (CVSS 10.0) in Honeywell IQ4x BMS Controller firmware versions 3.50 through 4.36_build_4.3.7.9 allows unauthorized attackers to access management settings, control components, and cause denial-of-service without authentication. Honeywell has not yet released a patch and recommends network isolation and defensive measures until remediation is available.",null,"https:\u002F\u002Fwww.cisa.gov\u002Fnews-events\u002Fics-advisories\u002Ficsa-26-069-03","2026-03-10T12:00:00+00:00","2026-03-14T09:41:12.043091+00:00",[],"80544778-fabb-4dcd-aa35-17492e5dcf4f",{"id":15,"icon":10,"name":17,"slug":18},"Vulnerabilities","vulnerabilities",[20,25],{"category":21},{"id":22,"icon":10,"name":23,"slug":24},"c5eccf7c-abbc-4bd3-bbed-e6da5cba8e73","Incident Response","incident-response",{"category":26},{"id":27,"icon":10,"name":28,"slug":29},"d6f63bb8-0801-486a-be7f-171400700454","IoT\u002FOT","iot-ot",[31],{"type":32,"value":33,"context":34},"cve","CWE-306","Missing Authentication for Critical Function in Honeywell IQ4x BMS Controller",[]]