CVE-2026-71931: DrayTek VigorSwitch Multiple Models OS Command Injection via tftp_upgrade
Multiple DrayTek VigorSwitch models contain a command injection vulnerability in the tftpupgrade function. The vulnerability is caused by insufficient filtering before the filename field is concatenated into a 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.
Affected Software
Event History
Frequently Asked Questions
What access does an attacker need to exploit this issue?
An attacker needs valid administrative credentials for the device's web management interface. The vulnerable input is the filename field used by the tftp_upgrade function.
What is the impact of successful exploitation?
A remote authenticated attacker can execute arbitrary operating-system commands with root privileges on the affected switch. This can compromise confidentiality, integrity, and availability of the device.
Are devices exposed by default?
The provided information does not state whether the web management interface or the vulnerable tftp_upgrade functionality is enabled or reachable by default. Exposure depends on whether an attacker can access the web interface and has administrative credentials.