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CriticalVulnerabilityCVE-2026-10133updated 25 Oct 2026, 15:22 UTC

TOTOLINK X2000R router: attacker can run code via firmware upgrade feature

A flaw in this TOTOLINK home router's firmware-upgrade feature could let someone take full control of the device. An attacker who can log in to the router can send a specially crafted web request to make it run their commands.

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 batchupg upgrade function
  3. 3Buffer overflowStack memory overwritten by oversized input
  4. 4Code executionAttacker commands run on the router
  5. ResultAttacker controls the router

What happened

A stack-based buffer overflow in the batchupg functionality of the TOTOLINK X2000R router lets a crafted HTTP request from an authenticated user overwrite memory and execute arbitrary code.

Why it is dangerous: Anyone who gets control of the router can intercept or redirect traffic, reach devices on the home or office network, and tamper with settings. Routers are a high-value target because they sit between users and the internet.

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 runs firmware version B20250421.1327 in its admin page.
  2. Check the TOTOLINK website or vendor support for a newer firmware release and install it if available.
  3. Change the router admin password to a strong unique one and restrict admin access to your local network.
  4. Disable remote management and replace the device if no fix is released.

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-2026-10133 · GHSA-grf6-vj3g-9fgv
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: attacker can run code via firmware upgrade feature · Zero Radar