CVE-2021-34572

Meter-reading falsification via undetected wireless replay

Published Sep 16, 2021 · Updated Sep 16, 2024

Insufficient data-authenticity verification in ENBRA EWM 1.7.29 allows physically proximate attackers to falsify readings via replayed frames. EWM accepts repeated wireless M-Bus Security mode 5 sensor data without detecting that it was previously received and replaces the sensor timestamp with the new readout time. Exploitation requires radio proximity to inject a captured meter frame, and the resulting stale data appears current, compromising meter-reading integrity without reported disclosure or interruption.

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

Insufficient data-authenticity verification in ENBRA EWM 1.7.29 allows physically proximate attackers to falsify readings via replayed frames. EWM accepts repeated wireless M-Bus Security mode 5 sensor data without detecting that it was previously received and replaces the sensor timestamp with the new readout time. Exploitation requires radio proximity to inject a captured meter frame, and the resulting stale data appears current, compromising meter-reading integrity without reported disclosure or interruption.

The record

CVE
CVE-2021-34572
Published
Sep 16, 2021
Updated
Sep 16, 2024
Vendor
ENBRA
Product
EWM
Classifications
CWE-345, T1565.002
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

6.5CERT@VDECVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
3.3NIST NVDAV:A/AC:L/Au:N/C:N/I:P/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectoradjacent
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-345Insufficient Verification of Data Authenticity
T1565.002Transmitted Data Manipulation

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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