CVE-2021-34577: In the Kaden PICOFLUX AiR water meter an adversary can read the values through wireless M-Bus mode 5 with a ha

Routine

MEDIUM 6.5MITIGATE

CVE-2021-34577 is a medium-severity flaw (CVSS 6.5) affecting picoflux air firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the Kaden PICOFLUX AiR water meter an adversary can read the values through wireless M-Bus mode 5 with a hardcoded shared key while being adjacent to the device.

Why this priority

No elevated risk signals yet

No fix is published yet: follow the downgrade or mitigation steps.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-798
Published	2022-11-09
Last modified	2026-06-17

Publisher (CNA): CERT VDE · Vendor: kadenvodomery

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2022-11-09 17:15 UTCPublished CVE record published
2026-06-17 03:56 UTCUpdated Record last modified

kadenvodomery picoflux air firmware MITIGATE

Affected: all versions

Fixed in: no fixed release known

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-34577?

picoflux air firmware: mitigate or apply the listed mitigation. Exact commands for each OS are on this page.

Is CVE-2021-34577 being exploited?

CVE-2021-34577 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-34577 affect?

CVE-2021-34577 affects picoflux air firmware. Severity is medium (CVSS 6.5). In the Kaden PICOFLUX AiR water meter an adversary can read the values through wireless M-Bus mode 5 with a hardcoded shared key while being adjacent to the device.

How urgent is CVE-2021-34577?

Priority 28/100. No elevated risk signals yet.

Related CVEs

CVE-2021-34576 MEDIUM 4.3 MITIGATE In Kaden PICOFLUX Air in all known versions an information exposure through observable discrepancy exists

References

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