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CVE-2021-34573— Incorrect calculation in Enbra EWM does not report backflows or no flow events

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 1.7.29 存在安全漏洞，该漏洞源于在版本1.7.29的Enbra EWM和几个经过测试的无线M-Bus传感器中，事件回流和“无流量”不会被重新识别或误解。这可能会导致错误的值和丢失事件。

CVSS 6.2 · Medium EPSS 0.23% · P14
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I. Basic Information for CVE-2021-34573

Vulnerability Information
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Vulnerability Title
Incorrect calculation in Enbra EWM does not report backflows or no flow events
Source: CVE Program / CVE List V5
Vulnerability Description
In Enbra EWM in Version 1.7.29 together with several tested wireless M-Bus Sensors the events backflow and "no flow" are not reconized or misinterpreted. This may lead to wrong values and missing events.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
数值计算不正确
Source: CVE Program / CVE List V5
Vulnerability Title
Enbra EWM 安全漏洞
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 1.7.29 存在安全漏洞，该漏洞源于在版本1.7.29的Enbra EWM和几个经过测试的无线M-Bus传感器中，事件回流和“无流量”不会被重新识别或误解。这可能会导致错误的值和丢失事件。
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
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-2021-34573

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III. Intelligence Information for CVE-2021-34573

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Other References for CVE-2021-34573 (1)

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

CVE-2021-34571 6.5 MEDIUM Hard-coded Credentials in Enbra Wireless M-Bus devices
CVE-2021-34572 6.5 MEDIUM Insufficient Verification of Data Authenticity in Enbra EWM (replay attack)

IV. Related Vulnerabilities

Same product: AT-WMBUS-16-2
Same vendor: Enbra
Same weakness: CWE-682

V. Comments for CVE-2021-34573

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