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01 Record

CVE-2026-3611

Honeywell IQ4x BMS Controller Missing authentication for critical function

CriticalPUBLISHEDCNA: icscert
CNA base score10.0 CVSS v4.0CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H

02 Description

Honeywell IQ4x BMS Controller Missing authentication for critical function

03 Exploitation and scoring

Exploitation
Assessed, none found. CISA's assessment recorded neither public exploit code nor evidence of exploitation when it was made.
SSVC decision
  • ExploitationnoneCISA recorded no public exploit code and no evidence of exploitation.
  • AutomatableyesAn attacker can reliably automate reconnaissance through exploitation, so this scales.
  • Technical ImpacttotalSuccessful exploitation gives total control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
5.59% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 92.8% of scored records. A rank, not a probability.
NVD base score
10.0 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
NVD analysis status
Analyzed. NVD last modified this record on 2026-06-17.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-03-12 20:06Z7 MO AGO
Last updated
2026-03-30 15:26Z7 MO AGO
Reserved
2026-03-05
Assigning CNA
icscert
Record state
PUBLISHED
Severity
Critical (CVSS 10.0)
CNA CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:H/SI:H/SA:H
Weaknesses
  • CWE-306Missing Authentication for Critical FunctionBase
Data version
5.2
Document digest
d862294aed9ffa939c651ec815e19ce9ff7789b0b932b85fd50ac4a8fe004075

05 Affected products

VendorProductVersionsPlatforms
HoneywellIQ4Ev3.50_3.44 to 4.36 (build 4.3.7.9)—
HoneywellIQ412v3.50_3.44 to 4.36 (build 4.3.7.9)—
HoneywellIQ422v3.50_3.44 to 4.36 (build 4.3.7.9)—
HoneywellIQ4NCv3.50_3.44 to 4.36 (build 4.3.7.9)—
HoneywellIQ41xv3.50_3.44 to 4.36 (build 4.3.7.9)—
HoneywellIQ3v3.50_3.44 to 4.36 (build 4.3.7.9)—
HoneywellIQECOv3.50_3.44 to 4.36 (build 4.3.7.9)—

06 References