Affected: DrayTek Corporation VigorSwitch G2540xs, DrayTek Corporation VigorSwitch P2540xs, DrayTek Corporation VigorSwitch FX2120, DrayTek Corporation VigorSwitch G2282x, DrayTek Corporation VigorSwitch P2282x, DrayTek Corporation VigorSwitch Q2300x, DrayTek Corporation VigorSwitch PQ2300xb, DrayTek Corporation VigorSwitch G2542x, DrayTek Corporation VigorSwitch P2542x, DrayTek Corporation VigorSwitch P2542xh and 18 more

Multiple DrayTek VigorSwitch models contain a command injection vulnerability in the tftp_upgrade 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.