Description (CNA)
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.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Honeywell / IQ4E | affected v3.50_3.44 through 4.36 (build 4.3.7.9) |
| Honeywell / IQ412 | affected v3.50_3.44 through 4.36 (build 4.3.7.9) |
| Honeywell / IQ422 | affected v3.50_3.44 through 4.36 (build 4.3.7.9) |
| Honeywell / IQ4NC | affected v3.50_3.44 through 4.36 (build 4.3.7.9) |
| Honeywell / IQ41x | affected v3.50_3.44 through 4.36 (build 4.3.7.9) |
| Honeywell / IQ3 | affected v3.50_3.44 through 4.36 (build 4.3.7.9) |
| Honeywell / IQECO | affected v3.50_3.44 through 4.36 (build 4.3.7.9) |
CWE
CWE-306
References
- https://www.cisa.gov/news-events/ics-advisories/icsa-26-069-03
- https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-069-03.json
- https://www.honeywell.com/us/en/contact
ADP enrichment
No English description supplied.
No references supplied.