What is CVE-2021-34571?

CVE-2021-34571 is a medium-severity vulnerability in Enbra At-Wmbus-16-2, classified under Use of Hard-coded Credentials. CVSS score: 6.5/10. Published 2021-09-16.

How severe is CVE-2021-34571?

Medium severity. CVSS v3 base score is 6.5 out of 10.

Vulnerability in Enbra At-Wmbus-16-2

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.

Published 2021-09-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.5 (Medium). Vector: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.002 (12.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 12th percentile — 12.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Enbra At-Wmbus-16-2 — versions all
Enbra Er-Am Dn 15 — versions ER-AM DN 15/SV all, ER-AM DN 15/TV all
Enbra Ewm — versions 1.7.29
Enbra Ewm 1.7.29 — versions 03.11.2019

Weakness classification (CWE)

CWE-798 — Use of Hard-coded Credentials

References

www.fit.vutbr.cz/~polcak/CVE-2021-34571.en (Third Party Advisory)

Frequently asked questions

What is CVE-2021-34571?: CVE-2021-34571 is a medium-severity vulnerability in Enbra At-Wmbus-16-2, classified under Use of Hard-coded Credentials. CVSS score: 6.5/10. Published 2021-09-16.
How severe is CVE-2021-34571?: Medium severity. CVSS v3 base score is 6.5 out of 10.