CVE-2021-33527— OS Command Injection in mbDIALUP <= 3.9R0.0
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I. Basic Information for CVE-2021-33527
Vulnerability Information
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Vulnerability Title
OS Command Injection in mbDIALUP <= 3.9R0.0
Source: NVD (National Vulnerability Database)
Vulnerability Description
In MB connect line mbDIALUP versions <= 3.9R0.0 a remote attacker can send a specifically crafted HTTP request to the service running with NT AUTHORITY\SYSTEM that will not correctly validate the input. This can lead to an arbitrary code execution with the privileges of the service.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: NVD (National Vulnerability Database)
Vulnerability Type
输入验证不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
MB connect line mbDIALUP 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
MB connect line mbDIALUP是MB connect line公司的一个应用软件。由 MB Connect Line GmbH 开发，供一位Software Informer用户使用。 MB connect line mbDIALUP 存在输入验证错误漏洞，该漏洞源于在MB连接线mbDIALUP版本<= 3.9R0.0中，低特权的攻击者可以向使用NT AUTHORITYSYSTEM运行的服务发送命令，指示它执行恶意的OpenVPN配置。攻击者可利用该漏洞执行任意代码。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| MB connect line | mbDIALUP | 3.9R0.0 ~ 3.9R0.0 | - |
II. Public POCs for CVE-2021-33527
| # | POC Description | Source Link | Shenlong Link |
|---|
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- https://cert.vde.com/de-de/advisories/vde-2021-017x_refsource_CONFIRM
- https://nvd.nist.gov/vuln/detail/CVE-2021-33527
Same Patch Batch · MB connect line · 2021-08-02 · 4 CVEs total
| CVE-2021-33526 | 7.8 HIGH | Privilege escalation in mbDIALUP <= 3.9R0.0 |
| CVE-2021-34575 | 7.5 HIGH | Information Exposure in mymbCONNECT24, mbCONNECT24 <= 2.8.0 |
| CVE-2021-34574 | 4.3 MEDIUM | Password policy evasion in products of MB connect line and Helmholz |
IV. Related Vulnerabilities
Same vendor: MB connect line
- CVE-2026-33617
MB connect line mbCONNECT24 vulnerable to an unauthenticated - CVE-2026-33616
MB connect line mbCONNECT24 vulnerable to an unauthenticated - CVE-2026-33615
MB connect line mbCONNECT24 vulnerable to an unauthenticated - CVE-2026-33614
MB connect line mbCONNECT24 vulnerable to an unauthenticated - CVE-2026-33613
MB connect line mbCONNECT24 vulnerable to RCE in generateSrp
Same weakness: CWE-20
V. Comments for CVE-2021-33527
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