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CVE-2021-20123: Draytek VigorConnect Path Traversal Vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2024-09-03
• EPSS: 89.7% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2021-10-13 · updated 2026-06-17
• Weakness: CWE-22

Description

A local file inclusion vulnerability exists in Draytek VigorConnect 1.6.0-B3 in the file download functionality of the DownloadFileServlet endpoint. An unauthenticated attacker could leverage this vulnerability to download arbitrary files from the underlying operating system with root privileges.

Affected products

• Draytek VigorConnect: 1.6.0-beta3

References

• https://www.tenable.com/security/research/tra-2021-42
• https://www.tenable.com/security/research/tra-2021-42
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2021-20123

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