CVE-2021-28909

Name: CVE-2021-28909
Creator: NVD / NIST
Published: 2021-09-09T18:15:08.683+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.35%

Last modified Jun 17, 2026

CVE-2021-28909 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. BAB TECHNOLOGIE GmbH eibPort V3 prior version 3.9.1 allow unauthenticated attackers to access uncontrolled the login service at /webif/SecurityModule in a brute force attack. The password could be weak and default username is known as 'admin'. EPSS estimates a 1.35% chance of exploitation in the next 30 days.

Description

BAB TECHNOLOGIE GmbH eibPort V3 prior version 3.9.1 allow unauthenticated attackers to access uncontrolled the login service at /webif/SecurityModule in a brute force attack. The password could be weak and default username is known as 'admin'. This is usable and part of an attack chain to gain SSH root access.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

1.35%

67.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-307

Affected Software

Vendor	Product	Versions
Bab-Technologie	Eibport Firmware	< 3.9.1

References

https://psytester.github.io/CVE-2021-28909Third Party Advisory
https://psytester.github.io/CVE-2021-28909Third Party Advisory

Timeline

Published: Sep 9, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-28909?

How severe is CVE-2021-28909?

CVE-2021-28909 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.35% probability of exploitation in the next 30 days.

How do I fix CVE-2021-28909?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-28909?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST