CVE-2021-34571 - CVE House
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Status published Medium CVE-2021-34571

Hard-coded Credentials in Enbra Wireless M-Bus devices

Vulnerability 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.

Impact Analysis

Refer to official advisory for detailed impact metrics.

Remediation

Ensure systems are updated to the latest vendor-supplied patch levels.

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Credits & Attribution

The following person or organization is credited with identifying this vulnerability, as recorded in the NVD database:

  • Libor POLČÁK reported to CERT@VDE

References

More from Enbra

View All →
CVE-2021-34573
Incorrect calculation in Enbra EWM does not report backflows or no flow events
Medium 6.2
CVE-2021-34572
Insufficient Verification of Data Authenticity in Enbra EWM (replay attack)
Medium 6.5

Affected Vendor

Affected Software

AT-WMBUS-16-2, ER-AM DN 15, EWM 1.7.29
Vulnerable Versions:
all, ER-AM DN 15/SV all, ER-AM DN 15/TV all, 03.11.2019

Timeline

Official Publish: September 16th, 2021
Last Modified: September 16th, 2024
Added to House: July 21st, 2026

CVSS Vectors

V3: CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Weaknesses (CWE)

CWE-798

MITRE ATT&CK TTPs

T1552 Unsecured Credentials
Credential Access
T1078 Valid Accounts
Persistence
T1021 Remote Services
Lateral Movement
T1190 Exploit Public-Facing Application
Initial Access
T1098 Account Manipulation
Privilege Escalation