CVE-2026-71904
Received Received - Intake

Command Injection in DrayTek VigorAP

Publication date: 2026-08-24

Last updated on: 2026-08-24

Assigner: VulnCheck

Description
Multiple DrayTek VigorAP models contain a command injection vulnerability in the tr069TestInform function. The vulnerability is caused by insufficient filtering of dangerous characters before the event_code field is concatenated into a system command. 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-2026-71904
EUVD
EUVD-2026-64963

Affected Vendors & Products

Showing 7 associated CPEs
Vendor Product Version / Range
draytek vigorap *
draytek vigorap 918r
draytek vigorap 960c
draytek vigorap 1060c
draytek vigorap 906
draytek vigorap 912c
draytek vigorap 903

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

CVE-2026-71904 is an OS command injection vulnerability in multiple DrayTek VigorAP models. It exists in the tr069TestInform function due to insufficient filtering of dangerous characters in the event_code field. This allows arbitrary command execution with root privileges when an attacker provides crafted input.

Detection Guidance

Detection requires checking if affected DrayTek VigorAP models are running vulnerable firmware versions. Inspect device firmware versions via the web management interface or CLI. Use network scanning tools like Nmap to identify DrayTek VigorAP models on the network. Verify if the device's model matches affected versions (e.g., VigorAP 918R, 960C, 1060C, 906, 912C, 903).

Commands to check firmware: Login to the device's web interface or SSH and run 'show version' or 'system info'. For network scanning, use 'nmap -p 80,443,22 --script vuln <target_IP>' to identify potential vulnerable devices.

Impact Analysis

An attacker with valid administrative credentials for the device's web management interface can exploit this to execute arbitrary commands with root privileges. This could lead to full system compromise, unauthorized access, data theft, or disruption of network services.

Compliance Impact

This vulnerability could lead to unauthorized access or data breaches, potentially violating compliance requirements under GDPR, HIPAA, or other regulations. Organizations may face legal penalties, reputational damage, and increased scrutiny due to inadequate security controls.

Mitigation Strategies

Immediately update affected DrayTek VigorAP devices to the latest firmware version provided by DrayTek. Disable remote administration access if not required. Restrict access to the device's web management interface to trusted IP addresses only.

Change default administrative credentials to strong, unique passwords. Monitor network traffic for unusual activity from these devices. Consider isolating affected devices from critical network segments until patched.

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