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CVE-2026-3611

10.0 CRITICAL

The Honeywell IQ4x building management controller, exposes its full web-based HMI without authentication in its factory-default configura...

Published: 2026-03-12 · Last updated: 2026-06-05

Severity and scoring

CVSS
10.0 CRITICAL
Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H
CWE
CWE-306

Affected products

VendorProduct
honeywelliq412_firmware, iq41x_firmware, iq422_firmware

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.

Source: NVD

References

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