CVE-2021-20125: draytek vigorconnect Path Traversal

Vulnerability summary

CVE-2021-20125 is a high (CVSS 10.0) Path Traversal vulnerability in draytek vigorconnect. EPSS estimates a 3.95% chance of exploitation in the next 30 days, higher than 90.3% of scored vulnerabilities. 1 public exploit is recorded.

Timeline

1. 13-10-2021
   PublishedVulnerability first disclosed.
2. 03-08-2024
   Last modifiedVulnerability information updated.

Description

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.

• CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')The product uses external input to construct a pathname that is intended to identify a file or directory that is located underneath a restricted parent directory, but the product does not properly neutralize special elements within the pathname that can cause the pathname to resolve to a location that is outside of the restricted directory.
• CWE-434Unrestricted Upload of File with Dangerous TypeThe product allows the upload or transfer of dangerous file types that are automatically processed within its environment.