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CriticalVulnerabilityCVE-2026-10136updated 25 Oct 2026, 15:22 UTC

TOTOLINK X2000R router: upload function can be abused to run attacker code

A flaw in the router's web upload feature lets someone who can log in send a specially crafted request that overwrites memory. That can let them take full control of the router.

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
  2. 2Crafted HTTP requestSent to the upload handler
  3. 3Buffer overflowHeap memory overwritten in formUpload()
  4. 4Code runs on routerAttacker code executes on the device
  5. ResultAttacker controls the router

What happened

A heap-based buffer overflow in the boa formUpload() function of the TOTOLINK X2000R (firmware TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327) allows arbitrary code execution via a crafted, authenticated HTTP request.

Why it is dangerous: An attacker who controls the device can run their own code on it, potentially spying on traffic, changing settings, or using it to reach other devices on the network. Anyone with a router of this model and firmware exposed to untrusted users is at risk.

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 someone who can authenticate.

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

What to do

  1. Check whether your router is a TOTOLINK X2000R on firmware B20250421.1327 and update to a newer firmware if the vendor has released one
  2. Restrict access to the router's web admin page to trusted devices only and do not expose it to the internet
  3. Change the admin password to a strong, unique one until a fix is installed

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-2026-10136 · GHSA-6p6v-m5v6-qvwr
CVSS
9.1 / 10
EPSS
0.6% 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: upload function can be abused to run attacker code · Zero Radar