How severe is CVE-2021-34571?

CVE-2021-34571 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.

Is CVE-2021-34571 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-34571?

CVE-2021-34571 affects Enbra Ewm. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-34571?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2021-34571 published?

CVE-2021-34571 was published on 2021-09-16 and last updated on 2026-06-17.

CVE-2021-34571

CVE-2021-34571 is a medium-severity vulnerability in Enbra Ewm with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-798.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
CVSS v2: 2.9
EPSS exploit prediction: 0% (12th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-798
Affected product: Enbra Ewm
Published: 2021-09-16
Last modified: 2026-06-17

Description

Multiple Wireless M-Bus devices by Enbra use Hard-coded Credentials in Security mode 5 without an option to change the encryption key. An adversary can learn all information that is available in Enbra EWM.

Frequently asked questions

What is CVE-2021-34571?: Multiple Wireless M-Bus devices by Enbra use Hard-coded Credentials in Security mode 5 without an option to change the encryption key. An adversary can learn all information that is available in Enbra EWM.
How severe is CVE-2021-34571?: CVE-2021-34571 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over an adjacent network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity none, and availability none.
Is CVE-2021-34571 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (12th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-34571?: CVE-2021-34571 affects Enbra Ewm. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-34571?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2021-34571 published?: CVE-2021-34571 was published on 2021-09-16 and last updated on 2026-06-17.

References

https://www.fit.vutbr.cz/~polcak/CVE-2021-34571.en

Affected products (1)

cpe:2.3:a:enbra:ewm:1.7.29:*:*:*:*:*:*:*

More vulnerabilities in Enbra Ewm

CVE-2021-34572 — Medium (CVSS 6.5): Enbra EWM 1.7.29 does not check for or detect replay attacks sent by wireless M-Bus Security mode 5 devices. Instead…
CVE-2021-34573 — Medium (CVSS 6.2): In Enbra EWM in Version 1.7.29 together with several tested wireless M-Bus Sensors the events backflow and "no flow"…

All CVEs affecting Enbra Ewm →

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