---
id: CVE-2026-71922
title: >-
  Multiple DrayTek VigorSwitch models contain a pre-authentication null pointer
  dereference vulnerability in the setget.cgi interface
summary: >-
  Multiple DrayTek VigorSwitch models contain a pre-authentication null pointer
  dereference vulnerability in the setget.cgi interface. The vulnerability is
  caused by missing validation when the pass field is absent. A remote attacker
  can t…
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-476
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-2026-71922'
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-null-pointer-dereference-via-setget-cgi
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00685
epssPercentile: 0.51272
ingestedAt: '2026-10-13T09:20:23.183Z'
---

## Overview

Multiple DrayTek VigorSwitch models contain a pre-authentication null pointer dereference vulnerability in the setget.cgi interface. The vulnerability is caused by missing validation when the pass field is absent. A remote attacker can trigger this vulnerability via a crafted request to crash the service and cause a denial of service.

## Remediation

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