CVE-2021-34573 : Security Advisory and Response

This CVE-2021-34573 article provides an in-depth analysis of the vulnerability in Enbra EWM version 1.7.29, impacting wireless M-Bus sensors. Learn about the description, impact, affected systems, exploitation mechanism, and mitigation steps.

Understanding CVE-2021-34573

CVE-2021-34573 is a vulnerability in Enbra EWM version 1.7.29 that leads to incorrect interpretation of events backflow and 'no flow,' potentially resulting in incorrect data and missed events.

What is CVE-2021-34573?

In Enbra EWM version 1.7.29, events backflow and 'no flow' are not properly recognized or are misinterpreted. This can cause inaccurate values and missing events in conjunction with various tested wireless M-Bus sensors.

The Impact of CVE-2021-34573

The vulnerability has a CVSS v3.1 base score of 6.2, classified as MEDIUM severity. It poses a risk of high integrity impact due to incorrect calculation, with a low attack complexity and vector being local.

Technical Details of CVE-2021-34573

This section delves into the specific technical details of CVE-2021-34573, outlining the vulnerability description, affected systems and versions, and the exploitation mechanism.

Vulnerability Description

The vulnerability in Enbra EWM version 1.7.29 affects the recognition and interpretation of events backflow and 'no flow,' leading to potential data inaccuracies and missing events due to incorrect calculations.

Affected Systems and Versions

Enbra products impacted include AT-WMBUS-16-2, ER-AM DN 15/SV, ER-AM DN 15/TV, and EWM 1.7.29, highlighting the significance of the vulnerability across various versions.

Exploitation Mechanism

The exploitation of this vulnerability involves manipulating the incorrect calculation of backflow and 'no flow' events, allowing threat actors to exploit the misinterpretation for malicious purposes.

Mitigation and Prevention

Explore the essential mitigation strategies and preventive measures to safeguard systems from CVE-2021-34573.

Immediate Steps to Take

To address the vulnerability, users are advised to apply security patches, update Enbra EWM to a secure version, and monitor for any unexpected data discrepancies or missing events.

Long-Term Security Practices

Implementing a robust security posture, conducting regular security audits, and ensuring timely software updates can enhance the overall resilience of systems against similar vulnerabilities in the future.

Patching and Updates

Enbra users should prioritize installing official patches released by the vendor, staying informed about security advisories, and maintaining proactive communication with the vendor for any emerging security concerns.