CVE-2026-71920 — DrayTek VigorSwitch Multiple Models NULL Pointer Dereference via formlogout
Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the formlogout function. The vulnerability is caused by missing checks for an empty or ab…
Published: 2026-08-24 · CVSS: 6.9 · CVSS 4.0
Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the formlogout function. The vulnerability is caused by missing checks for an empty or absent Cookie header before string handling. A remote attacker can trigger this vulnerability via a crafted request to crash the service and cause a denial of service. Exploitation requires valid administrative credentials for the device's web management interface.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7