CVE-2021-34571

Meter-data disclosure via fixed Wireless M-Bus key

Published Sep 16, 2021 · Updated Sep 16, 2024

Hard-coded credentials in ENBRA EWM 1.7.29 build 03.11.2019 allow physically proximate attackers to read Wireless M-Bus meter data. EWM decrypts Security mode 5 messages without accepting a user-supplied AES key, allowing the same software to decode broadcasts from unrelated deployed meters. Attackers need radio proximity and a compatible reading set; no privileges or user interaction are required, and the demonstrated impact is meter-data disclosure.

CVSS severity6.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Hard-coded credentials in ENBRA EWM 1.7.29 build 03.11.2019 allow physically proximate attackers to read Wireless M-Bus meter data. EWM decrypts Security mode 5 messages without accepting a user-supplied AES key, allowing the same software to decode broadcasts from unrelated deployed meters. Attackers need radio proximity and a compatible reading set; no privileges or user interaction are required, and the demonstrated impact is meter-data disclosure.

The record

CVE
CVE-2021-34571
Published
Sep 16, 2021
Updated
Sep 16, 2024
Vendor
ENBRA
Product
EWM
Classifications
CWE-798, T1040
Attack vector
adjacent
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 16, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=03.11.2019

What conditions does exploitation require?

Attack vectoradjacent
Required privilegesunauthenticated

What is affected?

ENBRA · EWMversion=03.11.2019

Published CVSS scores

2.9NVDAV:A/AC:M/Au:N/C:P/I:N/A:N
6.5NVDCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
6.5CERT@VDECVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-798Use of Hard-coded Credentials
T1040Network Sniffing

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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