CVE-2021-27656Network attack vector

Unauthenticated system information disclosure via health.web

Published Mar 18, 2021 · Updated Sep 17, 2024

Missing authorization in Johnson Controls exacqVision Web Service 20.12.2.0 and earlier allows remote attackers to read system information. The health.web information endpoint returns a full response without verifying that the requester is authorized. No credentials or user interaction are required, and exposure is limited to system-level details about the web service and its host operating system.

CVSS severity7.5
High
EPSS probability1.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Missing authorization in Johnson Controls exacqVision Web Service 20.12.2.0 and earlier allows remote attackers to read system information. The health.web information endpoint returns a full response without verifying that the requester is authorized. No credentials or user interaction are required, and exposure is limited to system-level details about the web service and its host operating system.

The record

CVE
CVE-2021-27656
Published
Mar 18, 2021
Updated
Sep 17, 2024
Vendor
Johnson Controls
Product
exacqVision Web Service
Classifications
CWE-862, CWE-200, T1082
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 18, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=unspecified <=20.12.2.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Johnson Controls · exacqVision Web Serviceversion=unspecified <=20.12.2.0

Published CVSS scores

5.0NIST NVDAV:N/AC:L/Au:N/C:P/I:N/A:N
5.3Johnson ControlsCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
7.5NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/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-862Missing Authorization
CWE-200Exposure of Sensitive Information to an Unauthorized Actor
T1082System Information 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

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Your stack

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