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AUSCERT External Security Bulletin Redistribution
Advisory (icsa-21-077-01) Johnson Controls Exacq Technologies exacqVision
19 March 2021
AusCERT Security Bulletin Summary
Product: Johnson Controls exacqVision
Operating System: Network Appliance
Impact/Access: Access Privileged Data -- Remote/Unauthenticated
CVE Names: CVE-2021-27656
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ICS Advisory (ICSA-21-077-01)
Johnson Controls Exacq Technologies exacqVision
Original release date: March 18, 2021
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1. EXECUTIVE SUMMARY
o CVSS v3 5.3
o ATTENTION: Exploitable remotely/low skill level to exploit
o Vendor: Exacq Technologies, Inc., a subsidiary of Johnson Controls
o Equipment: exacqVision
o Vulnerability: Information Exposure
2. RISK EVALUATION
Successful exploitation of this vulnerability could allow an unauthenticated
attacker to view system-level information about the exacqVision Web Service and
the operating system.
3. TECHNICAL DETAILS
3.1 AFFECTED PRODUCTS
Johnson Controls reports the vulnerability affects the following Exacq
o exacqVision Web Service: All supported versions up to and including
3.2 VULNERABILITY OVERVIEW
3.2.1 EXPOSURE OF SENSITIVE INFORMATION TO AN UNAUTHORIZED ACTOR CWE-200
exacqVision Web Service can expose sensitive information to an actor who is not
explicitly authorized to have access to that information.
CVE-2021-27656 has been assigned to this vulnerability. A CVSS v3 base score of
5.3 has been calculated; the CVSS vector string is ( AV:N/AC:L/PR:N/UI:N/S:U/
o CRITICAL INFRASTRUCTURE SECTORS: Critical Manufacturing
o COUNTRIES/AREAS DEPLOYED: Worldwide
o COMPANY HEADQUARTERS LOCATION: Ireland
Milan Kyselica reported this vulnerability to Johnson Controls, Inc.
Johnson Controls recommends users upgrade exacqVision Web Service to v21.03 or
For more detailed mitigation instructions, please see Johnson Controls Product
Security Advisory JCI-PSA-2021-03 .
CISA recommends users take defensive measures to minimize the risk of
exploitation of this vulnerability. Specifically, users should:
o Minimize network exposure for all control system devices and/or systems,
and ensure that they are not accessible from the Internet .
o Locate control system networks and remote devices behind firewalls, and
isolate them from the business network.
o When remote access is required, use secure methods, such as Virtual Private
Networks (VPNs), recognizing VPNs may have vulnerabilities and should be
updated to the most current version available. Also recognize VPN is only
as secure as the connected devices.
CISA reminds organizations to perform proper impact analysis and risk
assessment prior to deploying defensive measures.
CISA also provides a section for control systems security recommended practices
on the ICS webpage on us-cert.cisa.gov . Several recommended practices are
available for reading and download, including Improving Industrial Control
Systems Cybersecurity with Defense-in-Depth Strategies .
Additional mitigation guidance and recommended practices are publicly available
on the ICS webpage on us-cert.cisa.gov in the Technical Information Paper,
ICS-TIP-12-146-01B--Targeted Cyber Intrusion Detection and Mitigation
Organizations observing any suspected malicious activity should follow their
established internal procedures and report their findings to CISA for tracking
and correlation against other incidents.
No known public exploits specifically target this vulnerability.
For any questions related to this report, please contact the CISA at:
Toll Free: 1-888-282-0870
CISA continuously strives to improve its products and services. You can help by
choosing one of the links below to provide feedback about this product.
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