CVE-2021-27656

mediumpriority · track · 30OT risk · elevatedEPSS 0.013 · 71 %ileEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.34% (71st) EPSS

CVSS 5 · medium

Is it mine?

4 products

Check your exposure

Who says so?

4 sources

cnnvd · enisa_euvd · cisa_csaf_ot · nvd

EPSS · scored 2026-10-27

A vulnerability in exacqVision Web Service 20.12.2.0 and prior could allow an unauthenticated attacker to view system-level information about the exacqVision Web Service and the operating system.

remediations

Vendor fix, mitigation, or workaround guidance, as published by each source.

A vendor fix is available.

FixedexacqVision Web Servicecisa_csaf_ot
Johnson Controls recommends users upgrade exacqVision Web Service to v21.03 or higher.
MitigationexacqVision Web Servicecisa_csaf_ot
For more detailed mitigation instructions, please see Johnson Controls Product Security Advisory JCI-PSA-2021-03.
https://www.johnsoncontrols.com/cyber-solutions/security-advisories

cvss

Technical severity, 0–10. One row per scoring source.

7.5

010

base score 0–10 · higher = more severe · hover a vector to decode⚠ sources disagree · medium–high · 5–7.5

v2.05mediumAV:N/AC:L/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USexploitability 10 · impact 2.9

v3.17.5highCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USexploitability 3.9 · impact 3.6

v3.05.3mediumCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:Nsecondary · CISA US

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · ENISA EU

v3.15.3mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:Lsecondary · productsecurity@jci.comexploitability 3.9 · impact 1.4

v3.16.9mediumCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

weaknesses

The CWE weakness classes this flaw belongs to.

CWE-862USprimaryCWE-200US

affected products (4)

Products and version ranges known to be affected.

exacqVision Web Service: All supported versions up to and including v20.12.02.0all versionscisa_csaf_otUS
Exacq Technologies, Johnson Controls Inc. exacqVision Web Service≤ v20.12.02.0cisa_csaf_otUS
Johnson Controls exacqVision Web Service version 20.12.2.0 and prior≤ unspecified ≤20.12.2.0enisa_euvdEU
johnsoncontrols exacqvision web service≤ 20.12.2.0nvdUScpe:2.3:a:johnsoncontrols:exacqvision_web_service:*:*:*:*:*:*:*:*

advisories (1)

Vendor and ecosystem advisories describing this.

ICSA-21-077-01Johnson Controls Exacq Technologies exacqVision2021-03-18icsa · cisa_csaf_otUS
Successful exploitation of this vulnerability could allow an unauthenticated attacker to view system-level information about the exacqVision Web Service and the operating system.

also known as (3)

Other names and identifiers for this entity.

sources

Which sources assert this record, and when.

cnnvd enisa_euvd cisa_csaf_ot nvd NVD CVE.org MITRE

published 2021-03-18modified 2026-06-17

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+11477 more

references (9)

External citations — patches, advisories, analysis.

scry

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