Multiple DrayTek Vigor Routers Web Management Page Vulnerability
n/a — n/a
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.
9.8
100.0%
Vector breakdown
- Attack vector
- Network
- Attack complexity
- Low
- Privileges required
- None
- User interaction
- None
- Scope
- Unchanged
- Confidentiality
- High
- Integrity
- High
- Availability
- High
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Published
- Feb 1, 2020
- Modified
- Jun 17, 2026
- Added to KEV
- Nov 3, 2021
- Federal patch due
- May 3, 2022
CISA required action
Apply updates per vendor instructions.
Weakness classification
Affected packages
Proof-of-concept & exploitation references
3 foundWeaponization
Public repositories whose name or description references CVE-2020-8515, found via a live GitHub search at request time. These are community-sourced signals, not a verified working exploit — cross-check each one before relying on it, and treat higher star counts and recent activity as (weak) corroboration, not proof.
References
How this class of flaw gets exploited
Frequently asked questions
What is CVE-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 Vigor3900/2960/300B v1.5.1.
How severe is CVE-2020-8515?
CVE-2020-8515 has a CVSS base score of 9.8 out of 10 (CVSS 3.1).
Is CVE-2020-8515 actively exploited in the wild?
Yes. CVE-2020-8515 is listed in the CISA Known Exploited Vulnerabilities (KEV) catalog, added Nov 3, 2021, meaning CISA has confirmed evidence of active exploitation.
What is the EPSS score for CVE-2020-8515?
100.0% - meaning FIRST.org's EPSS model estimates a 100.0% probability this vulnerability will be exploited in the wild within 30 days (100% percentile among all scored CVEs).
Is there exploit tooling available for CVE-2020-8515?
Yes - a public Nuclei template referencing CVE-2020-8515 exist in public repositories we checked. We also found 3 public GitHub repositories referencing this CVE.
What type of vulnerability is CVE-2020-8515?
CVE-2020-8515 is classified under CWE-78 (CWE-78 Improper Neutralization of Special Elements used in an OS Command ('OS Command Injection')).
Cross-checked against
Impactr finds and proves whether CVE-2020-8515 — or flaws like it — are actually reachable in your own web apps and APIs, with a reproducible exploit as evidence.