What is CVE-2020-35565?

CVE-2020-35565 is a critical-severity vulnerability in Mbconnectline Mbconnect24, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 9.8/10. Published 2021-02-16.

How severe is CVE-2020-35565?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Mbconnectline Mbconnect24

CVE-2020-35565

An issue was discovered in MB CONNECT LINE mymbCONNECT24 and mbCONNECT24 through 2.6.2. The login pages bruteforce detection is disabled by default.

Published 2021-02-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.011 (64.0th percentile), scored 2026-09-30.

Low probability of exploitation in the next 30 days, but still tracked. 64th percentile — 64.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.011 · newest: 0.011 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-307 — Improper Restriction of Excessive Authentication Attempts

References

mbconnectline.com/security-advice/ (Vendor Advisory)
cert.vde.com/de-de/advisories/vde-2021-003 (Third Party Advisory)

Frequently asked questions

What is CVE-2020-35565?: CVE-2020-35565 is a critical-severity vulnerability in Mbconnectline Mbconnect24, classified under Improper Restriction of Excessive Authentication Attempts. CVSS score: 9.8/10. Published 2021-02-16.
How severe is CVE-2020-35565?: Critical severity. CVSS v3 base score is 9.8 out of 10.