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CriticalVulnerabilityCVE-2026-41222updated 25 Oct 2026, 15:22 UTC

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

A specially crafted web request sent to this router's admin interface can make it run attacker-supplied code. The attacker needs to be logged in to the router first.

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 boa web server's formParentControl URL
  3. 3Buffer overflowStack memory overwritten by oversized input
  4. 4Code executionAttacker code runs on the router
  5. ResultAttacker controls the router

What happened

A stack-based buffer overflow in the boa web server's formParentControl URL handling on TOTOLINK X2000R firmware allows arbitrary code execution via an authenticated HTTP request.

Why it is dangerous: An attacker who can log in to the router could gain full control of the device, which sits between your network and the internet, and could use it to spy on or redirect traffic on your network.

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 on this firmware version.
  2. Check the TOTOLINK website or your vendor for a firmware update that fixes this issue, and install it when available.
  3. Until a fix is available, change the router admin password to a strong unique one and restrict admin access to your local network only.
  4. Disable remote administration on the router if it is enabled.

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-2026-41222 · GHSA-h3h3-v9rc-9m3m
CVSS
9.1 / 10
EPSS
0.7% 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