VULNERABILITY INTELLIGENCE

CVE-2026-71920

CVSS score6.9 MEDIUM
EPSS probability0.56%
CISA KEVNot currently listed
Published2026-08-24
Last modified2026-10-13
CVSS vectorCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

Description

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.

Weakness classification

  • CWE-476: NULL Pointer Dereference

Primary references