What’s Vulnerable › Vulnerabilities

CVE-2020-15415: DrayTek Multiple Vigor Routers OS Command Injection Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2024-09-30
• EPSS: 84.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-06-30 · updated 2026-06-17
• Weakness: CWE-78

Description

On DrayTek Vigor3900, Vigor2960, and Vigor300B devices before 1.5.1, cgi-bin/mainfunction.cgi/cvmcfgupload allows remote command execution via shell metacharacters in a filename when the text/x-python-script content type is used, a different issue than CVE-2020-14472.

Affected products

• DrayTek Vigor2960: before 1.5.1 — fixed in 1.5.1
• DrayTek Vigor 300B: before 1.5.1 — fixed in 1.5.1
• DrayTek Vigor3900 Firmware: before 1.5.1 — fixed in 1.5.1

How to fix

Upgrade to a fixed version: DrayTek Vigor2960 1.5.1; DrayTek Vigor 300B 1.5.1; DrayTek Vigor3900 Firmware 1.5.1. Check the vendor advisory for mitigations.

References

• https://github.com/CLP-team/Vigor-Commond-Injection
• https://www.draytek.com/about/security-advisory
• https://github.com/CLP-team/Vigor-Commond-Injection
• https://www.draytek.com/about/security-advisory
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-15415

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