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CriticalVulnerabilityCVE-2026-114382updated 25 Oct 2026, 16:35 UTC

TOTOLINK EX200 router can be crashed or taken over remotely

Attackers on the network can send a specially crafted request to this Wi-Fi range extender that overflows its memory, which can crash it or let them run their own commands. Public exploit code exists.

Official, 2 sources
SeverityCriticalCVSS 9.3 of 10
Being exploited?Not knownNo attacks reported so far
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. 1AttackerSends a crafted request to the device
  2. 2Web interfacecstecgi.cgi handles setStaticDhcpConfig
  3. 3OverflowOversized Comment overwrites stack memory
  4. 4RouterAttacker code runs on the device
  5. ResultAttacker controls the extender

What happened

A stack-based buffer overflow in the setStaticDhcpConfig function of /cgi-bin/cstecgi.cgi (component lan.so) is triggered by an overly long Comment argument, and can be exploited remotely.

Why it is dangerous: An attacker who can reach the device, including over the internet if it is exposed, could take control of the extender and the home or office network behind it. Anyone running this TOTOLINK EX200 firmware is at risk.

Are you affected?

You are affected if you run TOTOLINK EX200 with firmware 5.2.3c.7200 and the device's web management interface is reachable by an attacker.

TOTOLINK EX200, firmware 5.2.3c.7200

What to do

  1. Check whether your TOTOLINK EX200 runs firmware 5.2.3c.7200 and look for a newer firmware from TOTOLINK
  2. Install the vendor's updated firmware as soon as it is available
  3. Block access to the device's web admin interface from the internet and disable remote management
  4. Replace the device if no fix is released and you cannot isolate it

Timeline

  1. 21 Oct 2026, 22:16 UTC
    Publicly disclosed
  2. 21 Oct 2026, 22:16 UTC
    Reported by NVD · NVD
  3. 25 Oct 2026, 16:35 UTC
    GitHub Advisory reported on it · GitHub Advisory

Sources 2 reports, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-114382 · GHSA-q7j2-7qg9-m53h
CVSS
9.3 / 10
EPSS
0.7% chance of exploitation within 30 days
Disclosed
21 Oct 2026, 22:16 UTC
On Zero Radar
before the radar started
Last change
25 Oct 2026, 16:35 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 EX200 router can be crashed or taken over remotely · Zero Radar