CVE-2026-3611
10.0 · CRITICALOverview
CVE-2026-3611 is a critical-severity vulnerability affecting honeywell iq4e_firmware. It was published on March 12, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).
This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
Technical Description
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.
Remediation
Check the references section for vendor advisories and patches from honeywell. Update iq4e_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| honeywell | iq4e_firmware | >= 0, < 3.30 | Affected |
| honeywell | iq412_firmware | >= 0, < 3.30 | Affected |
| honeywell | iq422_firmware | >= 0, < 3.30 | Affected |
| honeywell | iq4nc_firmware | >= 0, < 3.30 | Affected |
| honeywell | iq41x_firmware | >= 0, < 3.30 | Affected |
Frequently Asked Questions
What is CVE-2026-3611?
CVE-2026-3611 is a critical-severity vulnerability affecting honeywell iq4e_firmware. It was published on March 12, 2026 and has a CVSS 3.1 base score of 10.0 (CRITICAL).
How severe is CVE-2026-3611?
This vulnerability has a CVSS 3.1 base score of 10.0, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.
How do I fix or remediate CVE-2026-3611?
Check the references section for vendor advisories and patches from honeywell. Update iq4e_firmware to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.
How can CyberStrike help with CVE-2026-3611?
CyberStrike's AI-powered security agents can automatically detect CVE-2026-3611 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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