CVE-2021-20125: DrayTek VigorConnect

Critical severity, CVSS 9.8. EPSS: 3.9% chance of exploitation in the next 30 days.

An arbitrary file upload and directory traversal vulnerability exists in the file upload functionality of DownloadFileServlet in Draytek VigorConnect 1.6.0-B3. An unauthenticated attacker could leverage this vulnerability to upload files to any location on the target operating system with root privileges.

Affected products

• DrayTek VigorConnect: version 1.6.0 only

Published 2021-10-13. Last modified 2026-06-17.