What is CVE-2021-27657?

CVE-2021-27657 is a vulnerability that allows authenticated Metasys users to gain unintended access to the server file system and modify system files.

How does CVE-2021-27657 impact Johnson Controls Metasys?

CVE-2021-27657 affects Johnson Controls Metasys version up to and including 11.0, allowing authenticated users to manipulate system files.

What is the severity of CVE-2021-27657?

CVE-2021-27657 has a severity rating of high with a score of 8.8.

Is there a fix for CVE-2021-27657?

Yes, it is recommended to update Johnson Controls Metasys to a version beyond 11.0 to mitigate the vulnerability.

Vulnerability/
CVE-2021-27657

high

8.8

CWE

269

4/6/2021

17/9/2024

CVE-2021-27657: Metasys Improper Privilege Management

Q: How can an attacker exploit CVE-2021-27657?

An attacker can exploit CVE-2021-27657 by sending specifically crafted web messages to the Metasys system, gaining unauthorized access to sensitive files.

First published: Fri Jun 04 2021(Updated: )

Successful exploitation of this vulnerability could give an authenticated Metasys user an unintended level of access to the server file system, allowing them to access or modify system files by sending specifically crafted web messages to the Metasys system. This issue affects: Johnson Controls Metasys version 11.0 and prior versions.

Credit: productsecurity@jci.com

Affected Software	Affected Version	How to fix
Johnsoncontrols Metasys	<=11.0

Remedy

For Metasys versions previous to 9.0: Upgrade to a supported release. This is true for all the items except for Metasys Release 8.1 UL/cUL 864 UUKL 10th Edition Smoke Control.

Remedy

For Metasys versions 9.0 (engine only), 10.0, 10.1, 11.0: Install patch.

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Reference Links

Frequently Asked Questions

What is CVE-2021-27657?
CVE-2021-27657 is a vulnerability that allows authenticated Metasys users to gain unintended access to the server file system and modify system files.
How does CVE-2021-27657 impact Johnson Controls Metasys?
CVE-2021-27657 affects Johnson Controls Metasys version up to and including 11.0, allowing authenticated users to manipulate system files.
What is the severity of CVE-2021-27657?
CVE-2021-27657 has a severity rating of high with a score of 8.8.
How can an attacker exploit CVE-2021-27657?
An attacker can exploit CVE-2021-27657 by sending specifically crafted web messages to the Metasys system, gaining unauthorized access to sensitive files.
Is there a fix for CVE-2021-27657?
Yes, it is recommended to update Johnson Controls Metasys to a version beyond 11.0 to mitigate the vulnerability.

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canonical/johnsoncontrols metasys
version/johnsoncontrols metasys/11.0

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