GHSA-648m-vmc5-h63xMediumCVSS 4.9
Multiple DrayTek VigorSwitch models contain a null pointer dereference vulnerability in the...
🔗 CVE IDs covered (1)
📋 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.
🔗 References (4)
- https://nvd.nist.gov/vuln/detail/CVE-2026-71920
- https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026
- https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-null-pointer-dereference-via-formlogout
- https://github.com/advisories/GHSA-648m-vmc5-h63x