CVE-2026-71943
Received Received - Intake

Command Injection in DrayTek VigorSwitch

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 setDevNet 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-2026-71943
EUVD
EUVD-2026-65002

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
draytek vigorswitch From patched_versions (exc)

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 setDevNet 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

To detect this vulnerability, check if your DrayTek VigorSwitch models are running affected versions by reviewing the device's firmware version against DrayTek's security advisory. Inspect web interface logs for unusual command execution attempts or unauthorized administrative access.

Impact Analysis

An attacker could gain full control of the affected device, allowing them to manipulate network traffic, steal sensitive data, or use the device as a pivot point to attack other systems on the network. This could lead to data breaches or network disruption.

Compliance Impact

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

Mitigation Strategies

Immediately update the firmware of all affected DrayTek VigorSwitch models to the latest patched version provided by DrayTek. Ensure administrative credentials for the web management interface are strong and not shared. Monitor network traffic for suspicious activity targeting the device.

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