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CriticalVulnerabilityCVE-2026-9827updated 25 Oct 2026, 15:24 UTC

TOTOLINK X2000R router can be made to write files and run code

A router's web admin page has a flaw that lets someone who is logged in send a specially built request and plant files on the device. That can let them take 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 to the router
  2. 2Crafted HTTP requestSent to the formUploadFile function
  3. 3Arbitrary file writeRouter writes attacker-chosen files
  4. 4Code executionWritten files run on the device
  5. ResultAttacker controls the router

What happened

The boa formUploadFile function in TOTOLINK X2000R firmware does not properly restrict file writes, allowing arbitrary file write and code execution via a crafted authenticated HTTP request.

Why it is dangerous: An attacker who can log in to the router's web interface could take full control of the device, potentially intercepting or redirecting traffic for everyone on the 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 the TOTOLINK X2000R firmware version and compare it to TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327
  2. Check the vendor site for a firmware update that fixes this issue and install it when available
  3. Restrict access to the router's admin interface to trusted devices and disable remote management
  4. Change the router 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-2026-9827 · GHSA-p8wc-w2r7-2875
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, 15:24 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 can be made to write files and run code · Zero Radar