CVE-2026-71919
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 sysreboot function. The vulnerability is caused by insufficient filtering of the config, act, pathN, and valueN 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-2026-71919
EUVD
EUVD-2026-64978

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
draytek vigorswitch *
draytek vigorswitch to (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.

Attack-Flow Graph

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Executive Summary

This is an OS command injection vulnerability in multiple DrayTek VigorSwitch models. It exists in the sysreboot function due to insufficient input validation of fields like config, act, pathN, and valueN. Attackers with admin credentials can exploit this to run arbitrary commands with root privileges.

Detection Guidance

Detecting this vulnerability requires checking if affected DrayTek VigorSwitch models are running vulnerable firmware versions. Log in to the device's web management interface and inspect the firmware version. Compare it against the thresholds specified in the vendor advisory. Network scanning tools like Nmap may identify the device model and firmware version if exposed.

Impact Analysis

An attacker could take full control of the affected device, disrupt network operations, or use it as a pivot point to attack other systems. Since commands run with root privileges, the impact includes complete device compromise and potential lateral movement in the network.

Compliance Impact

This vulnerability could lead to unauthorized access and control of network devices, violating data protection and security requirements in GDPR, HIPAA, and other regulations. It may result in data breaches, loss of confidentiality, and non-compliance with security controls.

Mitigation Strategies

Immediately update the firmware of all affected DrayTek VigorSwitch devices to the latest patched version provided by DrayTek. Ensure administrative credentials are strong and not shared. Restrict access to the web management interface via IP whitelisting or VPN. Monitor for unusual activity or unauthorized commands.

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