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Vulnerabilities

Vulnerability · CVE-2020-8515

Multiple DrayTek Vigor Routers Web Management Page Vulnerability

Published Feb 1, 2020 · catalog updated Jun 16, 2026 · DrayTek Vigor Routers

Patch now

CVE-2020-8515 is in the CISA known-exploited catalog, due May 3, 2022. Confirm DrayTek Vigor Routers against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Severity
Critical9.8
Known exploitation
CISA KEV and VulnCheck KEV
EPSS
99.99%
Remediation
Remediation guidance
Affected products
cpe draytek/vigor2960 firmware · cpe draytek/vigor300b firmware · cpe draytek/vigor3900 firmware · vendor DrayTek Multiple Vigor Routers · vendor DrayTek Vigor Routers

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.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • 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
  • vendor DrayTek Vigor Routersversion unspecified

How to fix CVE-2020-8515

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

CVE-2020-8515 is in the CISA known-exploited catalog, due May 3, 2022. Confirm DrayTek Vigor Routers against the vendor advisory and apply that fix. The CVSS score does not change the priority.

Which versions are affected?

Compare what you have installed with draytek/vigor2960 firmware 1.3.1; draytek/vigor300b firmware 1.3.3; draytek/vigor300b firmware 1.4.2.1; draytek/vigor300b firmware 1.4.4. Apply updates per vendor instructions.

What should an analyst verify?

CWE-78: OS Command Injection. EPSS 99.99%. The CISA KEV listing is the exploitation evidence. A public exploit reference is linked in Sources. That is not the same as confirmed exploitation. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

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.

Sources

  • CISA KEVConfirmed exploitationCVE-2020-8515

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

    cisa.gov
  • CVE.orgVulnerability recordCVE-2020-8515

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2020-8515

    30-day exploitation probability 100.0%

    first.org
  • Exploit DatabasePublic exploit reference48268

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

    exploit-db.com
  • NIST NVDVulnerability recordCVE-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 SecurityCited referencehttp://packetstormsecurity.com/files/156979/DrayTek-Vigor2960-Vigor3900-Vigor300B-Remote-Command-Execution.html

    Packet Storm link already published on the finding.

    packetstormsecurity.com
  • VulnCheck KEVConfirmed exploitationCVE-2020-8515

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

    vulncheck.com

References

Freshness

Last verified in this catalog Oct 17, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.