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Findings

CVE-2020-8515

Multiple DrayTek Vigor Routers Web Management Page Vulnerability

Published Feb 1, 2020 · updated Jun 16, 2026 · draytek vigor2960 firmware

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.

Timeline

Detection, updates, and resolution for this record.

  1. Feb 1, 2020 · Catalog

    Detected

    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.

  2. Nov 3, 2021 · CISA KEV

    Known exploited

    Apply updates per vendor instructions.

  3. May 3, 2022 · CISA KEV

    Remediation due

    Apply updates per vendor instructions.

  4. Jun 16, 2026 · Catalog

    Updated

    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.

Required action

Apply updates per vendor instructions.

CISA due date May 3, 2022

Affected

  • cpe draytek/vigor2960 firmware1.3.1
  • cpe draytek/vigor300b firmware1.3.3
  • cpe draytek/vigor300b firmware1.4.2.1
  • cpe draytek/vigor300b firmware1.4.4
  • cpe draytek/vigor3900 firmware1.4.4
  • vendor DrayTek Multiple Vigor Routersversion unspecified

Sources

  • CISA KEVCVE-2020-8515

    DrayTek Vigor3900, Vigor2960, and Vigor300B routers contain an unspecified vulnerability that allows for remote code execution.

    cisa.gov
  • CVE.orgCVE-2020-8515

    Official CVE identifier

    cve.org
  • FIRST EPSSCVE-2020-8515

    30-day exploitation probability 100.0%

    first.org
  • Exploit Database48268

    Public archive entry. The exploit body is not stored here.

    exploit-db.com
  • NIST NVDCVE-2020-8515

    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 Vigor3900/296

    nvd.nist.gov
  • Packet Storm Securityhttp://packetstormsecurity.com/files/156979/DrayTek-Vigor2960-Vigor3900-Vigor300B-Remote-Command-Execution.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com

References