---
id: CVE-2026-71933
title: >-
  Multiple DrayTek VigorSwitch models contain unauthorized operation
  vulnerabilities in multiple syslog functions
summary: >-
  Multiple DrayTek VigorSwitch models contain unauthorized operation
  vulnerabilities in multiple syslog functions. The vulnerability is caused by
  missing authorization checks. A remote attacker can trigger these
  vulnerabilities via crafted…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H'
cwe:
  - CWE-862
published: '2026-08-24'
updated: '2026-10-12'
sourceUpdated: '2026-10-12T22:10:00.247'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-71933'
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-missing-authorization-in-syslog-functions
    label: disclosure@vulncheck.com
tags:
  - nvd
epss: 0.00553
epssPercentile: 0.44561
ingestedAt: '2026-10-12T23:07:25.624Z'
---

## Overview

Multiple DrayTek VigorSwitch models contain unauthorized operation vulnerabilities in multiple syslog functions. The vulnerability is caused by missing authorization checks. A remote attacker can trigger these vulnerabilities via crafted requests to modify configuration, restart services, save startup configuration, or clear logs.

## Remediation

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