Is CVE-2021-33526 actively exploited?

No active exploitation of CVE-2021-33526 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2021-33526 be exploited remotely?

No. CVE-2021-33526 requires local access to exploit.

What is the CVSS score of CVE-2021-33526?

CVE-2021-33526 has a CVSS score of 7.8 (HIGH).

HOME VULNERABILITIESCVE-2021-33526

HIGH

CVE-2021-33526

CWE-269Published: August 2, 2021· Updated: Jun 17, 2026

7.8

CVSS v3.1

Official Description

In MB connect line mbDIALUP versions <= 3.9R0.0 a low privileged local attacker can send a command to the service running with NT AUTHORITY\SYSTEM instructing it to execute a malicous OpenVPN configuration resulting in arbitrary code execution with the privileges of the service.

NVD Source

Technical Analysis

CVE-2021-33526 requires local access, meaning attackers must already have a foothold on the target system.

Exploitation requires low privileges, which limits the exposure to scenarios where an attacker has already gained initial access.

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 7.8.