CVE-2026-71929
Received Received - Intake

Command Injection in DrayTek VigorSwitch Series

Publication date: 2026-08-24

Last updated on: 2026-08-24

Assigner: VulnCheck

Description
Multiple DrayTek VigorSwitch models contain a command injection vulnerability in the setDevProto function. The vulnerability is caused by insufficient filtering of the username and password fields before command execution. A remote attacker can trigger this vulnerability via crafted input to execute arbitrary commands with root privileges. Exploitation requires valid administrative credentials for the device's web management interface.

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Meta Information

Published
2026-08-24
Last Modified
2026-08-24
Generated
2026-08-24
AI Q&A
2026-08-24
EPSS Evaluated
N/A
NVD
CVE-2026-71929
EUVD
EUVD-2026-64988

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
draytek vigorswitch *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-78 The product constructs all or part of an OS command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended OS command when it is sent to a downstream component.

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Executive Summary

This is an OS command injection vulnerability in multiple DrayTek VigorSwitch models. It exists in the setDevProto function due to insufficient filtering of username and password fields. A remote attacker with valid admin credentials can exploit this to execute arbitrary commands with root privileges.

Detection Guidance

Detecting this vulnerability requires checking if your DrayTek VigorSwitch models are running vulnerable versions. Log in to the device's web management interface and check the firmware version. Compare it against the affected versions listed in the advisory, such as VigorSwitch G2540xs versions below 3.9.10 or VigorSwitch P2540xs versions below 3.9.10.

Impact Analysis

An attacker could take full control of affected devices, steal sensitive data, disrupt network operations, or use the device as a pivot point for further attacks. Since commands run with root privileges, the impact is severe.

Compliance Impact

This vulnerability could lead to unauthorized access and data breaches, violating GDPR and HIPAA requirements for data protection and access control. Organizations may face compliance penalties and reputational damage.

Mitigation Strategies

Immediately update the firmware of all affected DrayTek VigorSwitch models to versions 3.9.10 or higher. Ensure administrative credentials for the web management interface are strong and not shared. Monitor network traffic for unusual activity and restrict access to the device's management interface to trusted networks only.

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