Is CVE-2021-28911 actively exploited?

No active exploitation of CVE-2021-28911 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-28911 be exploited remotely?

Yes. CVE-2021-28911 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2021-28911?

CVE-2021-28911 has a CVSS score of 9.8 (CRITICAL).

HOME VULNERABILITIESCVE-2021-28911

CRITICAL

CVE-2021-28911

CWE-307Published: September 9, 2021· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official Description

BAB TECHNOLOGIE GmbH eibPort V3 prior version 3.9.1 allow unauthenticated attackers access to /tmp path which contains some sensitive data (e.g. device serial number). Having those info, a possible loginId can be self-calculated in a brute force attack against BMX interface. This is usable and part of an attack chain to gain SSH root access.

NVD Source

Technical Analysis

CVE-2021-28911 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.