CVE-2021-33526

Name: CVE-2021-33526
Creator: NVD / NIST
Published: 2021-08-02T11:15:11.223+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.8/10EPSS 0.25%

Last modified Jun 17, 2026

CVE-2021-33526 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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.. EPSS estimates a 0.25% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

7.8/10

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

EPSS Probability

0.25%

16.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Mbconnectline	Mbdialup	<= 3.9r0.0

References

https://cert.vde.com/de-de/advisories/vde-2021-017Third Party Advisory
https://cert.vde.com/de-de/advisories/vde-2021-017Third Party Advisory

Timeline

Published: Aug 2, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-33526?

How severe is CVE-2021-33526?

CVE-2021-33526 has a CVSS score of 7.8/10 (HIGH severity). The EPSS model estimates a 0.25% probability of exploitation in the next 30 days.

How do I fix CVE-2021-33526?

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-2021-33526?

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

Scan your code now

Source: NVD / NIST