CVE-2026-71922 [HIGH] – Multiple DrayTek VigorSwitch models contain a pre-authentication null pointer dereference

Multiple DrayTek VigorSwitch models contain a pre-authentication null pointer dereference vulnerability in the setget.cgi interface. The vulnerability is caused by missing validation when the pass field is absent. A remote attacker can trigger this vulnerability via a crafted request to crash the service and cause a denial of service.