What’s Vulnerable › Vulnerabilities

CVE-2020-8515: Multiple DrayTek Vigor Routers Web Management Page Vulnerability

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: yes — in CISA KEV since 2021-11-03
• EPSS: 100.0% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-02-01 · updated 2026-06-17
• Weakness: CWE-78

Description

DrayTek Vigor2960 1.3.1_Beta, Vigor3900 1.4.4_Beta, and Vigor300B 1.3.3_Beta, 1.4.2.1_Beta, and 1.4.4_Beta devices allow remote code execution as root (without authentication) via shell metacharacters to the cgi-bin/mainfunction.cgi URI. This issue has been fixed in Vigor3900/2960/300B v1.5.1.

Affected products

• DrayTek Vigor2960: 1.3.1-beta
• DrayTek Vigor 300B: 1.3.3-beta, 1.4.2.1-beta, 1.4.4-beta
• DrayTek Vigor3900 Firmware: 1.4.4-beta

References

• http://packetstormsecurity.com/files/156979/DrayTek-Vigor2960-Vigor3900-Vigor300B-Remote-Command-Execution.html
• https://sku11army.blogspot.com/2020/01/draytek-unauthenticated-rce-in-draytek.html
• https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-router-web-management-page-vulnerability-%28cve-2020-8515%29/
• http://packetstormsecurity.com/files/156979/DrayTek-Vigor2960-Vigor3900-Vigor300B-Remote-Command-Execution.html
• https://sku11army.blogspot.com/2020/01/draytek-unauthenticated-rce-in-draytek.html
• https://www.draytek.com/about/security-advisory/vigor3900-/-vigor2960-/-vigor300b-router-web-management-page-vulnerability-%28cve-2020-8515%29/
• https://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2020-8515

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