Improper Access Validation in products of MB connect line and Helmholz

published 2021-03-02 5 y ago modified 2026-06-17 4 mo ago also EUVD-2020-4829

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 1.0%; EPSS 1.0% chance of exploitation in 30 days, percentile 64%
public exploits: 0; none known

An issue was discovered in MB connect line mymbCONNECT24, mbCONNECT24 and Helmholz myREX24 and myREX24.virtual in all versions through v2.11.2. Improper access validation allows a logged in user to shutdown or reboot devices in his account without having corresponding permissions.

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

cisa ICSA-21-061-03 updated 2021-03-02 cvss 6.5

MB connect line mbCONNECT24, mymbCONNECT24

MB connect line mymbCONNECT24 <= 2.6.1
affected: mitigation “Additional details can be found on MB connect line's website.”

From CISA ICS and IT advisories (CSAF, https://github.com/cisagov/CSAF), a U.S. Government work; changed: reduced to products, statuses and remediations. CISA notification · csaf

Exploit prediction

1.03% chance of exploitation in the next 30 days, higher than 64% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
NVD	2.0	6.8	AV:N/AC:L/Au:S/C:N/I:N/A:C

Affected products

MB connect line mymbCONNECT24
MB connect line mbCONNECT24
Helmholz myREX24
Helmholz myREX24.virtual

Classification

Weakness

CWE-269 Improper Privilege Management

References

cert.vde.com /en/advisories/VDE-2021-003
third-party-advisory
cert.vde.com /en/advisories/VDE-2022-039
third-party-advisory

Sources

CVE List CVE-2020-12527
NVD CVE-2020-12527

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary