CVE-2026-3611

CRITICALNVD 10.010.0—
EchelonGraph scoreMEDIUM confidence

Score 10.0 from GitHub Security Advisory (severity: CRITICAL) published 2026-03-12. NVD baseline CVSS 10.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
10.0EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 6%CVSS: 10.0Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
10.0
EG Score
10.0(medium)
EG Risk
62(Track)
EG Risk 62/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity100% × 45%
Exploitation6% × 40%
Automatability100% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
6%
EPSS %ILE
92%
KEV
Not listed

Published

March 12, 2026

Last Modified

June 17, 2026

Advisory Details (3)

Auto-updated Sep 15, 2026
Patch available. Sources: cisa.
generic

Contact | Honeywell

https://www.honeywell.com/us/en/contact
cisa Patch Available

Honeywell IQ4x BMS Controller (Update A) | CISA

https://www.cisa.gov/news-events/ics-advisories/icsa-26-069-03
generic

CSAF/csaf_files/OT/white/2026/icsa-26-069-03.json at develop · cisagov/CSAF · GitHub

https://github.com/cisagov/CSAF/blob/develop/csaf_files/OT/white/2026/icsa-26-069-03.json

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 7× in last 7d / 25× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 171 total refreshes for this CVE.

  1. 2026-09-18 19:28 UTCEPSS rescore
  2. 2026-09-18 19:28 UTCEPSS rescore
  3. 2026-09-17 19:30 UTCEPSS rescore
  4. 2026-09-16 14:08 UTCEPSS rescore
  5. 2026-09-16 05:15 UTCEPSS rescore
  6. 2026-09-15 03:11 UTCEPSS rescore
  7. 2026-09-13 16:47 UTCEPSS rescore
  8. 2026-09-12 15:01 UTCEPSS rescore
  9. 2026-09-11 14:53 UTCEPSS rescore
  10. 2026-09-11 09:37 UTCEPSS rescore
  11. 2026-09-10 09:34 UTCEPSS rescore
  12. 2026-09-08 22:00 UTCEPSS rescore
  13. 2026-09-06 13:47 UTCEPSS rescore
  14. 2026-09-04 05:06 UTCEPSS rescore
  15. 2026-09-02 14:12 UTCEPSS rescore
  16. 2026-09-01 13:53 UTCEPSS rescore
  17. 2026-09-01 04:39 UTCEPSS rescore
  18. 2026-08-30 19:17 UTCEPSS rescore
  19. 2026-08-30 01:22 UTCEPSS rescore
  20. 2026-08-28 21:41 UTCEPSS rescore
  21. 2026-08-27 14:25 UTCEPSS rescore
  22. 2026-08-26 14:46 UTCEPSS rescore
  23. 2026-08-25 13:49 UTCEPSS rescore
  24. 2026-08-23 00:19 UTCEPSS rescore
  25. 2026-08-21 23:49 UTCEPSS rescore
Show 75 more
  1. 2026-08-20 22:55 UTCEPSS rescore
  2. 2026-08-19 17:03 UTCEPSS rescore
  3. 2026-08-18 13:48 UTCEPSS rescore
  4. 2026-08-17 13:47 UTCEPSS rescore
  5. 2026-08-16 14:56 UTCEPSS rescore
  6. 2026-08-16 11:41 UTCEG score recompute
  7. 2026-08-16 11:41 UTCGHSA enrichment
  8. 2026-08-16 02:14 UTCEPSS rescore
  9. 2026-08-15 01:30 UTCEPSS rescore
  10. 2026-08-15 00:54 UTCGHSA enrichment
  11. 2026-08-14 20:37 UTCGHSA enrichment
  12. 2026-08-14 16:16 UTCGHSA enrichment
  13. 2026-08-14 11:59 UTCGHSA enrichment
  14. 2026-08-14 07:42 UTCEG score recompute
  15. 2026-08-14 07:42 UTCGHSA enrichment
  16. 2026-08-13 22:00 UTCEPSS rescore
  17. 2026-08-13 03:00 UTCGHSA enrichment
  18. 2026-08-12 22:43 UTCEG score recompute
  19. 2026-08-12 22:43 UTCGHSA enrichment
  20. 2026-08-12 13:51 UTCEPSS rescore
  21. 2026-08-12 01:59 UTCGHSA enrichment
  22. 2026-08-11 21:42 UTCEG score recompute
  23. 2026-08-11 21:42 UTCGHSA enrichment
  24. 2026-08-11 13:43 UTCEPSS rescore
  25. 2026-08-11 09:07 UTCGHSA enrichment
  26. 2026-08-11 04:50 UTCEG score recompute
  27. 2026-08-11 04:50 UTCGHSA enrichment
  28. 2026-08-11 00:00 UTCEPSS rescore
  29. 2026-08-10 12:53 UTCGHSA enrichment
  30. 2026-08-10 06:37 UTCGHSA enrichment
  31. 2026-08-10 02:18 UTCGHSA enrichment
  32. 2026-08-09 22:01 UTCGHSA enrichment
  33. 2026-08-09 17:44 UTCEG score recompute
  34. 2026-08-09 17:44 UTCGHSA enrichment
  35. 2026-08-09 13:46 UTCEPSS rescore
  36. 2026-08-09 13:26 UTCGHSA enrichment
  37. 2026-08-09 07:22 UTCEG score recompute
  38. 2026-08-09 07:22 UTCGHSA enrichment
  39. 2026-08-08 16:37 UTCEPSS rescore
  40. 2026-08-08 11:27 UTCGHSA enrichment
  41. 2026-08-08 06:54 UTCGHSA enrichment
  42. 2026-08-08 02:37 UTCGHSA enrichment
  43. 2026-08-07 22:20 UTCGHSA enrichment
  44. 2026-08-07 18:03 UTCEG score recompute
  45. 2026-08-07 18:03 UTCGHSA enrichment
  46. 2026-08-06 19:48 UTCEG score recompute
  47. 2026-08-06 19:48 UTCGHSA enrichment
  48. 2026-08-06 13:46 UTCEPSS rescore
  49. 2026-08-06 10:30 UTCGHSA enrichment
  50. 2026-08-06 06:12 UTCGHSA enrichment
  51. 2026-08-06 01:55 UTCEG score recompute
  52. 2026-08-06 01:55 UTCGHSA enrichment
  53. 2026-08-05 19:17 UTCEPSS rescore
  54. 2026-08-04 15:10 UTCEPSS rescore
  55. 2026-08-04 10:38 UTCEPSS rescore
  56. 2026-08-04 05:43 UTCGHSA enrichment
  57. 2026-08-04 01:11 UTCEG score recompute
  58. 2026-08-04 01:11 UTCGHSA enrichment
  59. 2026-08-03 10:36 UTCEPSS rescore
  60. 2026-08-03 01:54 UTCGHSA enrichment
  61. 2026-08-02 21:37 UTCGHSA enrichment
  62. 2026-08-02 17:19 UTCEG score recompute
  63. 2026-08-02 17:19 UTCGHSA enrichment
  64. 2026-08-02 02:27 UTCEPSS rescore
  65. 2026-08-01 04:16 UTCEPSS rescore
  66. 2026-07-30 16:28 UTCEPSS rescore
  67. 2026-07-30 01:30 UTCEPSS rescore
  68. 2026-07-25 14:18 UTCEPSS rescore
  69. 2026-07-25 14:18 UTCEPSS rescore
  70. 2026-07-24 14:17 UTCEPSS rescore
  71. 2026-07-24 14:17 UTCEPSS rescore
  72. 2026-07-23 14:18 UTCEPSS rescore
  73. 2026-07-23 14:18 UTCEPSS rescore
  74. 2026-07-23 03:10 UTCEG score recompute
  75. 2026-07-22 14:08 UTCEPSS rescore

Frequently asked(5)

What is CVE-2026-3611?
CVE-2026-3611 is a critical vulnerability published on March 12, 2026. 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…
When was CVE-2026-3611 disclosed?
CVE-2026-3611 was first published in the National Vulnerability Database on March 12, 2026, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-3611 actively exploited?
CVE-2026-3611 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6% probability of exploitation in the next 30 days, which ranks it in the top 7.6% of all scored CVEs.
What is the CVSS score of CVE-2026-3611?
CVE-2026-3611 has a CVSS v3 base score of 10.0 (NVD).
How do I remediate CVE-2026-3611?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-3611, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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