CVE-2021-34573
Official description Straight from the sourceThe vendor's or NVD's own wording, published unedited. Authoritative, but often terse — it says what broke, rarely what to do.
NVD · uneditedIn 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.
Technical summary Written by usOur analysis, written from the advisory, the CVSS vector and the affected-version data. It adds context the advisory leaves out, and never invents facts that are not in the source.
dbcve analysis · moderate confidenceEnbra EWM version 1.7.29 fails to properly recognize or correctly interpret 'backflow' and 'no flow' events from wireless M-Bus sensors, resulting in incorrect measurement values and missing event notifications in the building energy monitoring system.
Verify against the referenced sources before acting — the references below are authoritative for this CVE, this summary is not.
Affected products & versions What the vendor confirmedThe version ranges the vendor confirmed as vulnerable. If your version sits inside a range here, treat yourself as exposed until you have upgraded.
NVD · CPE data= 1.7.29CVSS breakdown How the score is builtThe industry scoring standard. It rates how the flaw is reached, what it takes to exploit, and what an attacker gains — the score is derived from those, not the other way round.
From the vector- Attack vector
- Local
- Complexity
- Low
- Privileges
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- None
- Integrity
- High
- Availability
- None
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Am I affected? How to checkSteps we derive from the advisory and the affected-version data, so you can decide whether this CVE reaches your setup. They are a guide, not a scan — your own configuration is the authority.
dbcve checksWork through these to decide whether this CVE applies to you.
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Identify the installed Enbra EWM versionLocate the version information for your Enbra EWM installation (check system information, about page, or version file) and confirm it is exactly 1.7.29Affected if The installed version is Enbra EWM version 1.7.29 exactly
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Determine if wireless M-Bus sensors are in useReview your Enbra EWM system configuration to identify whether any wireless M-Bus sensors are connected or configured for measurement collectionAffected if Wireless M-Bus sensors are configured and actively reporting to the EWM system
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Check for missing event notificationsExamine the event notification logs or alerts in the Enbra EWM interface for any missing or unprocessed 'backflow' and 'no flow' event notificationsAffected if Backflow or no flow events from M-Bus sensors are not appearing in the event log despite sensors being present
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Verify measurement value accuracyCompare recent measurement values from M-Bus sensors against expected baseline values to identify any discrepancies that could indicate incorrect processingAffected if Measurement values from M-Bus sensors appear incorrect or inconsistent with physical expectations
You are affected if your Enbra EWM installation is exactly version 1.7.29 and you use wireless M-Bus sensors that should generate backflow or no flow events, with those events missing from logs or measurements appearing incorrect.
Generated from the published advisory. Verify against your own configuration.
Remediation Closing itWhat it takes to close this. Where a vendor fix exists we point at it; where none exists we say so plainly, and can build one. Effort estimates are scoped from the advisory, not from your codebase.
From vendor dataContact Enbra for the patched version of EWM that properly processes M-Bus sensor events, and verify correct event handling after updating.
- Consultation3.0 h
- Implementation2.0 h
- Testing4.0 h
- Review / QA2.0 h
An estimate, not a bill — we confirm scope with you before any work starts. Need it this week? Rush from $3,072.
Scan for this in your stack
Free · runs locallyCheck whether your project pulls in CVE-2021-34573 — or any other known-vulnerable package — straight from your lock files. Free and open source; it runs locally and uploads nothing.
References Go to the primary sourcePrimary sources — vendor advisories, patches and trackers. Where our summary and a reference disagree, the reference wins.
Primary sourcesPractitioner notes
ContributedPeer-ranked notes from engineers who’ve handled CVE-2021-34573 in production — separate from our analysis above.
The advisory tells you what broke. It rarely tells you what actually worked. If you’ve dealt with this one, that detail is what the next engineer is searching for.
- The version that genuinely resolved it — not the one the vendor claimed
- A config change or rule that shut the vector down
- A gotcha in the upgrade path that cost you an afternoon
No notes yet
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- Verified mitigations, workarounds, and config changes
- Version or environment caveats, and links to real fixes
- No weaponised exploit code, or anything meant to cause harm
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