DrayTek VigorAP 903 Auto Test Command apautotest CMD0/CMD3/CMD6 command injection

Summaryinfo

A vulnerability classified as very critical has been found in DrayTek VigorAP 918R, VigorAP 960C, VigorAP 1060C, VigorAP 906, VigorAP 912C and VigorAP 903. This affects the function apautotest of the component Auto Test Command Handler. Performing a manipulation of the argument CMD0/CMD3/CMD6 results in command injection. This vulnerability was named CVE-2026-71910. The attack may be initiated remotely. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as very critical, was found in DrayTek VigorAP 918R, VigorAP 960C, VigorAP 1060C, VigorAP 906, VigorAP 912C and VigorAP 903. This affects the function apautotest of the component Auto Test Command Handler. The manipulation of the argument CMD0/CMD3/CMD6 with an unknown input leads to a command injection vulnerability. CWE is classifying the issue as 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. This is going to have an impact on confidentiality, integrity, and availability. The summary by CVE is:

Multiple DrayTek VigorAP models contain a command injection vulnerability in the apautotest function. The vulnerability is caused by insufficient validation of the CMD0, CMD3, and CMD6 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.

It is possible to read the advisory at draytek.com. This vulnerability is uniquely identified as CVE-2026-71910 since 08/08/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. Additional levels of successful authentication are necessary for exploitation. Technical details of the vulnerability are known, but there is no available exploit. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 08/24/2026). The attack technique deployed by this issue is T1202 according to MITRE ATT&CK.

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 903
• VigorAP 906
• VigorAP 912C
• VigorAP 918R
• VigorAP 960C
• VigorAP 1060C

License

• commercial

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