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CriticalVulnerabilityCVE-2026-42022updated 25 Oct 2026, 15:22 UTC

TOTOLINK X2000R router can be taken over through its IPv6 setup page

Someone who can log in to this router's web admin page can send a specially crafted request that overflows memory and lets them run their own code on the device. That can mean full control of your home or office network.

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 admin access to the router
  2. 2Sends crafted requestOversized static_dns2 value to IPv6 setup
  3. 3Buffer overflowsStack memory overwritten in boa handler
  4. 4Code runs on routerAttacker gains control of the device
  5. ResultAttacker controls the router

What happened

Stack-based buffer overflows in the boa formIpv6Setup static network configuration handler of the TOTOLINK X2000R firmware (TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327), triggered via the static_dns2 parameter, allow arbitrary code execution with an authenticated HTTP request.

Why it is dangerous: An attacker who gets past the login can run code on the router, which can expose traffic, change DNS and settings, and reach other devices on the network. Anyone with this router model on this firmware is at risk.

Are you affected?

You are affected if you run TOTOLINK X2000R router firmware TOTOLINK-X2000R-Gh-V1.0.0-B20250421.1327 with the web admin interface reachable.

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

What to do

  1. Check whether your router is a TOTOLINK X2000R on the affected firmware version and look for a vendor firmware update.
  2. Install the vendor's fixed firmware as soon as it is available.
  3. Until then, restrict access to the router's admin page to trusted devices and do not expose it to the internet.

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-2026-42022 · GHSA-hv4f-3pwg-585p
CVSS
9.1 / 10
EPSS
0.5% 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 its IPv6 setup page · Zero Radar