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CVE-2021-34571— Hard-coded Credentials in Enbra Wireless M-Bus devices

Quick assessment

Affected
Enbra AT-WMBUS-16-2
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.

Enbra Ewm是捷克Enbra公司的一个通用读数装置。使用无线电读取水表、供暖成本指标和热量表。 Enbra EWM存在信任管理问题漏洞，该漏洞源于Enbra的多个无线M-Bus设备在安全模式5中使用硬编码凭证，没有更改加密密钥的选项。攻击者可以了解Enbra EWM中提供的所有信息。

CVSS 6.5 · Medium EPSS 0.23% · P14

Possible ATT&CK Techniques 1 AI

T1552.004 · Private Keys
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I. Basic Information for CVE-2021-34571

Vulnerability Information
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Vulnerability Title
Hard-coded Credentials in Enbra Wireless M-Bus devices
Source: CVE Program / CVE List V5
Vulnerability Description
Multiple Wireless M-Bus devices by Enbra use Hard-coded Credentials in Security mode 5 without an option to change the encryption key. An adversary can learn all information that is available in Enbra EWM.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用硬编码的凭证
Source: CVE Program / CVE List V5
Vulnerability Title
Enbra Ewm信任管理问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Enbra Ewm是捷克Enbra公司的一个通用读数装置。使用无线电读取水表、供暖成本指标和热量表。 Enbra EWM存在信任管理问题漏洞，该漏洞源于Enbra的多个无线M-Bus设备在安全模式5中使用硬编码凭证，没有更改加密密钥的选项。攻击者可以了解Enbra EWM中提供的所有信息。
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
Enbra AT-WMBUS-16-2 all -
Enbra ER-AM DN 15 ER-AM DN 15/SV all -
Enbra EWM 1.7.29 03.11.2019 -

II. Public POCs for CVE-2021-34571

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III. Intelligence Information for CVE-2021-34571

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Other References for CVE-2021-34571 (1)

Same Patch Batch · Enbra · 2021-09-16 · 3 CVEs total

CVE-2021-34572 6.5 MEDIUM Insufficient Verification of Data Authenticity in Enbra EWM (replay attack)
CVE-2021-34573 6.2 MEDIUM Incorrect calculation in Enbra EWM does not report backflows or no flow events

IV. Related Vulnerabilities

Same product: AT-WMBUS-16-2
Same vendor: Enbra
Same weakness: CWE-798

V. Comments for CVE-2021-34571

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