Security readout for executives and security teams
Plain-English summary
Kaden PICOFLUX AiR water meters use a hardcoded shared key that can let someone nearby read meter values over wireless M-Bus. The main business risk is exposure of utility consumption data, not system takeover, service interruption, or data modification based on the provided sources.
Executive priority
Treat this as a moderate-priority asset and privacy exposure issue. It does not indicate remote compromise, but all listed versions are affected and hardcoded credentials can be difficult to remediate without vendor support or device replacement.
Technical view
CVE-2021-34577 is CWE-798 hardcoded credentials in Kaden PICOFLUX AiR. An adjacent unauthenticated attacker can read values through wireless M-Bus mode 5 using a hardcoded shared key. CVSS 3.1 is 6.5 with high confidentiality impact and no stated integrity or availability impact.
Likely exposure
Organizations operating Kaden PICOFLUX AiR water meters are potentially exposed, with all versions listed as affected. Real-world exposure depends on device deployment, radio proximity, and the sensitivity of meter-reading data in the operating environment.
Exploitation context
The provided bundle does not report active exploitation and marks KEV as false. The attack is proximity-limited: an adversary must be adjacent to the device's wireless range. The sources do not provide public exploit status, patch status, or detailed remediation guidance.
Researcher notes
Evidence is concise but consistent: affected product is Kaden PICOFLUX AiR, all versions, with adjacent attack vector and confidentiality-only impact. Sources do not name a patch, workaround, exploit publication, or operational detection method.
Mitigation direction
- Inventory deployments of Kaden PICOFLUX AiR water meters.
- Check Kaden or supplier guidance for firmware, replacement, or compensating controls.
- Limit physical access near deployed meters where practical.
- Assess whether exposed meter values create privacy or operational risk.
- Consider replacement if vendor guidance cannot remove hardcoded credential risk.
Validation and detection
- Confirm whether any deployed meters are Kaden PICOFLUX AiR.
- Record firmware, model, installation location, and wireless configuration details.
- Verify whether wireless M-Bus mode 5 is enabled or used.
- Review vendor and supplier advisories for available remediation.
- Document sites where adjacent radio access is plausible.
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-798: Credential and account abuse lookup
Authentication and credential weaknesses can make valid-account abuse and credential telemetry useful review starting points. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2021-34577 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
- 6.5 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/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:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N2.83.6Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
6.5MediumVector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source materials
- CVE List V5 sourceCVE List V5
- https://www.fit.vutbr.cz/~polcak/CVE-2021-34577CVE reference
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.
Use of Hard-coded Credentials
Use of Hard-coded Credentials represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.