DrayTek VigorAP CGI Interface upload_settings.cgi restorekey command injection

Summaryinfo

A vulnerability classified as very critical was found in DrayTek VigorAP. This impacts an unknown function of the file upload_settings.cgi of the component CGI Interface. Executing a manipulation of the argument restorekey can lead to command injection. The identification of this vulnerability is CVE-2026-71913. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability has been found in DrayTek VigorAP (version unknown) and classified as very critical. This vulnerability affects an unknown function of the file upload_settings.cgi of the component CGI Interface. The manipulation of the argument restorekey with an unknown input leads to a command injection vulnerability. The CWE definition for the vulnerability is CWE-77. The product constructs all or part of a command using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the intended command when it is sent to a downstream component. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

Multiple DrayTek VigorAP models contain a command injection vulnerability in the upload_settings.cgi interface. The vulnerability is caused by insufficient filtering before the restorekey field is concatenated into a shell 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.

The advisory is shared for download at draytek.com. This vulnerability was named CVE-2026-71913 since 08/08/2026. The exploitation appears to be easy. The attack can be initiated remotely. Additional levels of successful authentication are needed for exploitation. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 08/24/2026). The MITRE ATT&CK project declares the attack technique as T1202.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Type

• Router Operating System

Vendor

• DrayTek

Name

• VigorAP

License

• commercial

CPE 2.3info

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CPE 2.2info

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