CVE-2021-33526: Mbconnectline Mbdialup

High severity, CVSS 7.8. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Mbconnectline Mbdialup: up to and including 3.9r0.0

Published 2021-08-02. Last modified 2026-06-17.