---
id: CVE-2026-42021
title: >-
  Multiple stack-based buffer overflow vulnerabilities exist in the boa
  formIpv6Setup static network configuration functionality of Totolink X2000R
  TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327
summary: >-
  Multiple stack-based buffer overflow vulnerabilities exist in the boa
  formIpv6Setup static network configuration functionality of Totolink X2000R
  TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. A specially crafted HTTP request can
  lead to arbi…
severity: critical
cvss: 9.1
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H'
cvssSource: cna
cwe:
  - CWE-121
vendor: totolink
product: Totolink
affected:
  - Totolink TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T20:25:23.513Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-42021'
references:
  - url: 'https://talosintelligence.com/vulnerability_reports/TALOS-2026-2395'
    label: 'https://talosintelligence.com/vulnerability_reports/TALOS-2026-2395'
tags:
  - cve.org
ingestedAt: '2026-10-20T21:19:21.275Z'
---

## Overview

Multiple stack-based buffer overflow vulnerabilities exist in the boa formIpv6Setup static network configuration functionality of Totolink X2000R TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327. A specially crafted HTTP request can lead to arbitrary code execution. An attacker can make an authenticated HTTP request to trigger these vulnerabilities. This vulnerability concerns the static_dns1 parameter.

## Affected

- `Totolink TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327`

## Remediation

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