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CriticalVulnerabilityCVE-2026-10139updated 25 Oct 2026, 15:22 UTC

TOTOLINK X2000R router can be taken over via crafted web requests

A specially crafted web request sent to this TOTOLINK router can make it run an attacker's 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 credentials to the router
  2. 2Crafted HTTP requestRequest sent to the Mcli functionality
  3. 3Buffer overflowStack memory overwritten by oversized input
  4. 4Code runs on routerAttacker gains arbitrary code execution
  5. ResultAttacker controls the router

What happened

A stack-based buffer overflow in the Mcli functionality of the TOTOLINK X2000R router lets a crafted HTTP request trigger arbitrary code execution after authentication.

Why it is dangerous: An attacker who gains control of the router can intercept or redirect traffic and reach devices on the home or office network. Anyone running this router firmware is at risk.

Are you affected?

You are affected if you run TOTOLINK X2000R with firmware version TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327.

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

What to do

  1. Check the router's firmware version in its admin interface and confirm whether it matches the affected version.
  2. Check the vendor's website or support channel for a newer firmware release that fixes this issue, and install it when available.
  3. Restrict access to the router's web admin interface to trusted devices and disable remote management from the internet.
  4. Use a strong, unique admin password to reduce the chance an attacker can log in in the first place.

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-2026-10139 · GHSA-r78c-9frx-8x59
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 can be taken over via crafted web requests · Zero Radar