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CriticalVulnerabilityCVE-2026-42026updated 25 Oct 2026, 15:22 UTC

TOTOLINK X2000R router can be taken over through a crafted web request

A flaw in the router's web setup page lets someone with a login send a specially made request that makes the router run their code. That means they could control your home or office network device.

Official, 2 sources
SeverityCriticalCVSS 9.1 of 10
Being exploited?UnclearNo reports either way yet
Fix available?UnclearNo fixed version published in the sources yet
How sure is this?Official, 2 sourcesBacked by an official source

How the attack works simplified

  1. 1Attacker with loginNeeds valid admin credentials to send request
  2. 2Crafted HTTP requestOversized dhcp_dns2 value sent to setup page
  3. 3Buffer overflowStack memory overwritten in boa formIpv6Setup handler
  4. 4Code executionAttacker code runs on the router
  5. ResultAttacker controls the router

What happened

A stack-based buffer overflow in the boa formIpv6Setup handler, in the dhcp_dns2 parameter, of TOTOLINK X2000R firmware allows arbitrary code execution via an authenticated crafted HTTP request.

Why it is dangerous: Successful exploitation gives an attacker control of the router, so they could intercept or redirect traffic and reach other devices on the network. Anyone running this TOTOLINK X2000R firmware is at risk.

Are you affected?

You are affected if you run TOTOLINK X2000R with firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327.

TOTOLINK X2000R, firmware TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327

What to do

  1. Check the router's firmware version in its admin page and see whether it matches the affected build
  2. Check TOTOLINK's website or support channels for a firmware update that fixes this issue and install it
  3. Restrict access to the router's web admin interface and use a strong, unique admin password until a fix is applied

Timeline

  1. 20 Oct 2026, 21:17 UTC
    Publicly disclosed
  2. 20 Oct 2026, 21:17 UTC
    Reported by NVD · NVD
  3. 25 Oct 2026, 15:22 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-42026 · GHSA-6667-35q5-27x8
CVSS
9.1 / 10
EPSS
0.5% chance of exploitation within 30 days
Disclosed
20 Oct 2026, 21:17 UTC
On Zero Radar
before the radar started
Last change
25 Oct 2026, 15:22 UTC

The plain-language parts and the attack diagram were written by an AI model (anthropic/claude-haiku-5.5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

TOTOLINK X2000R router can be taken over through a crafted web request · Zero Radar