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CriticalVulnerabilityCVE-2026-120345updated 2 Nov 2026, 06:21 UTC

WAVLINK router lets remote attackers run system commands

Attackers on the internet may be able to send a specially crafted request to this WAVLINK router and make it run commands of their choosing. That could give them control over the device.

NewOfficial source
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 sourceBacked by an official source

How the attack works simplified

  1. 1Attacker sends requestCrafted data sent to the router remotely
  2. 2DNS handler receives inputArgument passed without proper validation
  3. 3Command gets injectedInput is run as an OS command in /bin/ioos
  4. 4Router is controlledAttacker runs commands on the device
  5. ResultAttacker controls the router

What happened

A command injection flaw in the DNS Resolution Handler (function sub_41a430 in /bin/ioos) of WAVLINK WN551X3-A firmware M51X3_V251020-WO-182e965 lets remote attackers inject OS commands via the data argument.

Why it is dangerous: An attacker who controls the device can take over the router, intercept or redirect traffic, and reach other devices on the network. Anyone running this router with remote access exposed is at risk.

Are you affected?

You are affected if you run WAVLINK WN551X3-A with firmware M51X3_V251020-WO-182e965.

WAVLINK WN551X3-A, firmware M51X3_V251020-WO-182e965

What to do

  1. Check whether your router runs firmware M51X3_V251020-WO-182e965 and look for a vendor update
  2. Disable remote/internet management on the router until a fix is confirmed
  3. Restrict admin access to your local network and change default passwords

Timeline

  1. 2 Nov 2026, 06:17 UTC
    Publicly disclosed
  2. 2 Nov 2026, 06:17 UTC
    Reported by NVD · NVD
  3. 2 Nov 2026, 06:21 UTC
    Picked up by Zero Radar

Sources 1 report, oldest first

Official vendor, government CERT or advisory database

Technical details

ID
CVE-2026-120345
CVSS
9.3 / 10
Disclosed
2 Nov 2026, 06:17 UTC
On Zero Radar
2 Nov 2026, 06:21 UTC (3 min after disclosure)
Last change
2 Nov 2026, 06:21 UTC

The plain-language parts and the attack diagram were written by an AI model (claude-haiku-5-5) from the sources above. Facts like versions, exploitation and dates come from the sources themselves. How Zero Radar works

WAVLINK router lets remote attackers run system commands · Zero Radar