CVE-2026-71906: Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection') in DrayTek Corporation VigorAP 918R
Description
CVE-2026-71906 is a high-severity OS command injection vulnerability in multiple DrayTek VigorAP models, including the VigorAP 918R. The flaw exists in the setLan function due to insufficient validation of the lanIp and lanNetmask fields before executing system commands. An attacker with valid administrative credentials on the device's web management interface can exploit this to execute arbitrary commands with root privileges.
CVSS v4.0
Score 8.6high
Affected software
DrayTek Corporation
VigorAP 918R
DrayTek Corporation
VigorAP 960C
DrayTek Corporation
VigorAP 1060C
DrayTek Corporation
VigorAP 906
DrayTek Corporation
VigorAP 912C
DrayTek Corporation
VigorAP 903
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
This vulnerability arises from improper neutralization of special elements in the setLan function of DrayTek VigorAP 918R and other models. Specifically, the lanIp and lanNetmask inputs are not sufficiently validated before being used in OS command execution, enabling command injection. Exploitation requires authenticated access with administrative privileges to the device's web interface, allowing remote attackers to run arbitrary commands as root.
Potential Impact
Successful exploitation allows an attacker with administrative credentials to execute arbitrary OS commands with root privileges on the affected device. This can lead to full system compromise, unauthorized control, and potential disruption of network services managed by the device.
Mitigation Recommendations
No official patch or remediation has been confirmed or published by the vendor as of the current information. Users should monitor DrayTek's official advisories for updates. Until a fix is available, restrict administrative access to trusted personnel only and consider additional network-level protections to limit exposure of the device's management interface.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- VulnCheck
- Date Reserved
- 2026-08-08T16:37:44.517Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6a8c7de7acd9273b49e1b324
Added to database: 08/24/2026, 17:22:47 UTC
Last enriched: 09/10/2026, 10:07:11 UTC
Last updated: 10/07/2026, 18:48:22 UTC
Views: 32
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