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CriticalVulnerabilityCVE-2026-9869updated 25 Oct 2026, 15:24 UTC

TOTOLINK X2000R router can be taken over via crafted web request

A flaw in the web management page of this TOTOLINK router lets someone who can log in send a specially crafted request that can make the router run their code. A router taken over this way can be used to spy on or disrupt your network.

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 logs inNeeds valid authenticated access to the router
  2. 2Crafted HTTP requestSent to the router's web management page
  3. 3Buffer overflowformTR069Config overflows the stack
  4. 4Code executionAttacker runs commands on the router
  5. ResultAttacker controls the router

What happened

A stack-based buffer overflow in the boa web server's formTR069Config handler on TOTOLINK X2000R firmware allows arbitrary code execution through a crafted authenticated HTTP request.

Why it is dangerous: An attacker who gets through the router's login can run code on the device, which can expose traffic and other devices on the home or office network. Anyone using this router model with the affected firmware is at risk.

Are you affected?

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

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

What to do

  1. Check whether your router is a TOTOLINK X2000R running firmware B20250421.1327.
  2. Check the TOTOLINK website or support for a fixed firmware version and install it when available.
  3. Until a fix is installed, restrict access to the router's web management page and change its admin password.

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, 15:24 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-9869 · GHSA-vh8v-g37q-6mg8
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, 15:24 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 via crafted web request · Zero Radar