Security readout for executives and security teams
Plain-English summary
This is a metering integrity flaw, not a data-theft issue. Enbra EWM 1.7.29 with specific wireless M-Bus sensors may miss or misread backflow and no-flow events, leading to wrong values and missing operational events.
Executive priority
Prioritize where meter data affects revenue, regulatory reporting, or operational safety. For low-impact monitoring-only deployments, handle through normal asset remediation and vendor follow-up.
Technical view
CVE-2021-34573 is CWE-682, incorrect calculation. Sources report that Enbra EWM 1.7.29, with affected Enbra AT-WMBUS-16-2 and ER-AM DN 15 sensor variants, fails to recognize or misinterprets backflow and no-flow events. CVSS 3.1 is 6.2 with local attack vector and high integrity impact.
Likely exposure
Exposure is likely limited to environments using the named Enbra EWM and wireless M-Bus sensor combinations. Business impact depends on whether these readings drive billing, utility operations, compliance reporting, or anomaly response.
Exploitation context
The CVE record does not indicate known active exploitation, and it is not listed as KEV in the provided bundle. The CVSS vector describes local attack conditions, but public details provided here do not include exploit mechanics.
Researcher notes
Evidence is limited to the CVE metadata and confirming advisory. Sources do not name a patch, root-cause detail beyond incorrect calculation, or active exploitation. Validation should focus on affected-version confirmation and data-integrity testing.
Mitigation direction
- Inventory Enbra EWM and listed wireless M-Bus sensor deployments.
- Check Enbra or advisory guidance for corrected versions or operational workarounds.
- Use independent checks for backflow and no-flow conditions where accuracy matters.
- Review billing and operational reports for suspect meter values.
- Limit local access to affected metering infrastructure.
Validation and detection
- Confirm whether EWM version 1.7.29 dated 03.11.2019 is deployed.
- Map connected sensors to AT-WMBUS-16-2 and ER-AM DN 15 variants.
- Compare EWM events against independent meter records or manual inspections.
- Review historical data for missing backflow or no-flow alerts.
- Document vendor response and remediation status.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-682: Exact CWE lookup
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Open ATT&CK lookupCVE-2021-34573 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 6.2 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N2.53.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.2MediumVector: CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.fit.vutbr.cz/~polcak/CVE-2021-34573.enCVE reference · x_refsource_CONFIRM
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Incorrect Calculation
Incorrect Calculation represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.