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CVE-2021-27657— Metasys Improper Privilege Management

Quick assessment

Affected
Johnson Controls Metasys
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Johnson Controls Metasys system是美国江森自控（Johnson Controls）公司的一套楼宇自动化系统。 Johnson Controls Metasys 11.0版本及之前版本存在安全漏洞，该漏洞允许攻击者向Metasys系统发送专门设计的web消息来访问或修改系统文件。

CVSS 8.8 · High EPSS 1.24% · P68

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage
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I. Basic Information for CVE-2021-27657

Vulnerability Information
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Vulnerability Title
Metasys Improper Privilege Management
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
特权管理不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
Johnson Controls Metasys 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Johnson Controls Metasys system是美国江森自控（Johnson Controls）公司的一套楼宇自动化系统。 Johnson Controls Metasys 11.0版本及之前版本存在安全漏洞，该漏洞允许攻击者向Metasys系统发送专门设计的web消息来访问或修改系统文件。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Johnson Controls Metasys 11.0 ~ 11.0 -

II. Public POCs for CVE-2021-27657

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2021-27657

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Vendor Advisories for CVE-2021-27657 (1)

Other References for CVE-2021-27657 (1)

IV. Related Vulnerabilities

Same product: Metasys
Same vendor: Johnson Controls
Same weakness: CWE-269

V. Comments for CVE-2021-27657

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