CVE-2021-36200Network attack vector

Unauthenticated user enumeration via web API access

Published Jul 22, 2022 · Updated Sep 16, 2024

Missing authentication in Metasys ADS/ADX/OAS 10 before 10.1.6 and 11 before 11.0.2 allows remote attackers to enumerate users. The web API permits unauthenticated user-list access under conditions that Johnson Controls has not disclosed, and no endpoint or faulty authorization check is public. Network access to a server with MUI is required; the documented consequence is disclosure of account names, not data modification or service interruption.

CVSS severity5.3
Medium
EPSS probability0.68%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Missing authentication in Metasys ADS/ADX/OAS 10 before 10.1.6 and 11 before 11.0.2 allows remote attackers to enumerate users. The web API permits unauthenticated user-list access under conditions that Johnson Controls has not disclosed, and no endpoint or faulty authorization check is public. Network access to a server with MUI is required; the documented consequence is disclosure of account names, not data modification or service interruption.

The record

CVE
CVE-2021-36200
Published
Jul 22, 2022
Updated
Sep 16, 2024
Vendor
Johnson Controls
Product
Metasys
Classifications
CWE-306, T1087
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 22, 2022CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=All 10 versions <10.1.6
  2. Affected versionversion=All 11 versions <11.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Johnson Controls · Metasysversion=All 10 versions <10.1.6; version=All 11 versions <11.0.2

Published CVSS scores

5.3Johnson ControlsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-306Missing Authentication for Critical Function
T1087Account Discovery

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo