---
id: CVE-2026-71921
title: >-
  Multiple DrayTek VigorSwitch models contain a pre-authentication command
  injection vulnerability in the setget.cgi interface
summary: >-
  Multiple DrayTek VigorSwitch models contain a pre-authentication command
  injection vulnerability in the setget.cgi interface. The vulnerability is
  caused by insufficient filtering of the pass field before command execution. A
  remote atta…
severity: critical
cvss: 9.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-78
published: '2026-08-24'
updated: '2026-10-13'
sourceUpdated: '2026-10-13T09:10:00.323'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71921'
references:
  - url: >-
      https://www.draytek.com/about/security-advisory/multiple-vulnerabilities-in-vigorswitch-series-august-2026/
    label: disclosure@vulncheck.com
  - url: >-
      https://www.vulncheck.com/advisories/draytek-vigorswitch-multiple-models-pre-authentication-os-command-injection-via-setget-cgi
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.02787
epssPercentile: 0.86034
ingestedAt: '2026-10-13T09:20:23.183Z'
---

## Overview

Multiple DrayTek VigorSwitch models contain a pre-authentication command injection vulnerability in the setget.cgi interface. The vulnerability is caused by insufficient filtering of the pass field before command execution. A remote attacker can trigger this vulnerability via crafted input to execute arbitrary commands with root privileges.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.