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CriticalVulnerabilityCVE-2026-9660updated 25 Oct 2026, 15:24 UTC

TOTOLINK X2000R router: remote code execution via crafted web request

A logged-in user of the router's web admin page can send a specially crafted request that overwrites memory and lets them run their own commands on the router. Anyone who controls the router could then spy on traffic or take it over.

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 sends requestCrafted HTTP request to admin page
  2. 2Web server parses inputvpnPassword value overflows a stack buffer
  3. 3Code injectedAttacker payload runs on the router
  4. 4Router taken overAttacker controls traffic and settings
  5. ResultAttacker controls the router

What happened

Stack-based buffer overflows in the boa web server's formFilter handler on TOTOLINK X2000R firmware V1.0.0-B20250421.1327, triggered through the vpnPassword parameter, allow arbitrary code execution.

Why it is dangerous: Successful exploitation gives full control of the router, which can expose all network traffic and connected devices, especially on home or small office networks.

Are you affected?

You are affected if you run TOTOLINK X2000R with firmware TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 and the router's web management interface is reachable by an attacker.

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

What to do

  1. Check whether your router runs TOTOLINK X2000R firmware V1.0.0-B20250421.1327 and look for a newer firmware from TOTOLINK.
  2. Install any updated firmware from the vendor as soon as it is available.
  3. Turn off remote access to the router's web admin page and do not expose it to the internet.
  4. Change the admin password to a strong, unique one.

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-2026-9660 · GHSA-5v52-r4w9-96c8
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: remote code execution via crafted web request · Zero Radar