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CriticalVulnerabilityCVE-2026-40615updated 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 can make it run attacker-supplied code. The attacker must first be logged in to the router's web interface.

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 web interface
  2. 2Crafted HTTP requestSent to the formParentControl handler
  3. 3Buffer overflowdeviceName input overruns the stack in boa
  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 formParentControl handler, in the deviceName parameter, of the TOTOLINK X2000R router allows arbitrary code execution via an authenticated HTTP request.

Why it is dangerous: An attacker who can authenticate to the router could gain full control of the device, potentially intercepting or redirecting traffic for everyone on the home or small-office network.

Are you affected?

You are affected if you run TOTOLINK X2000R with firmware TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 and its web management interface is reachable by untrusted users.

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

What to do

  1. Check whether your router runs TOTOLINK X2000R firmware B20250421.1327 and check the vendor's site for a newer firmware.
  2. Install the vendor's updated firmware as soon as it is available.
  3. Change the router admin password to a strong unique one and do not expose the admin interface to the internet.
  4. Restrict access to the router's management page to trusted devices on your local network.

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-2026-40615 · GHSA-97cf-wp6g-w5h6
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