CVE-2021-34573Public exploit

Metering-event loss via unlocalized event-processing failure

Published Sep 16, 2021 · Updated Sep 17, 2024

Incorrect calculation in ENBRA EWM 1.7.29 with tested wireless M-Bus meters allows attackers to suppress or falsify metering events. Testing could not determine whether the radio module fails to generate qualifying events or EWM fails to parse them. Attackers must manipulate water flow at an affected meter; consequences include understated consumption, missed leak indicators, and false tamper alerts.

CVSS severity5.5
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

Incorrect calculation in ENBRA EWM 1.7.29 with tested wireless M-Bus meters allows attackers to suppress or falsify metering events. Testing could not determine whether the radio module fails to generate qualifying events or EWM fails to parse them. Attackers must manipulate water flow at an affected meter; consequences include understated consumption, missed leak indicators, and false tamper alerts.

The record

CVE
CVE-2021-34573
Published
Sep 16, 2021
Updated
Sep 17, 2024
Vendor
ENBRA
Product
AT-WMBUS-16-2
Classifications
CWE-682, T1565
Attack vector
physical
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 16, 2021CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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?

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  1. Affected versionversion=all

What conditions does exploitation require?

Attack vectorphysical
Required privilegesunauthenticated

What is affected?

ENBRA · AT-WMBUS-16-2version=all
ENBRA · ER-AMversion=ER-AM DN 15/SV all; version=ER-AM DN 15/TV all
ENBRA · EWMversion=03.11.2019

Published CVSS scores

2.1NIST NVDAV:L/AC:L/Au:N/C:N/I:P/A:N
6.2CERT VDECVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
5.5NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/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)
Vectorphysical
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-682Incorrect Calculation
T1565Data Manipulation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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