---
id: CVE-2026-120345
title: WAVLINK WN551X3-A DNS Resolution ioos sub_41a430 os command injection
summary: >-
  A vulnerability was found in WAVLINK WN551X3-A M51X3_V251020-WO-182e965. This
  impacts the function sub_41a430 of the file /bin/ioos of the component DNS
  Resolution Handler. Performing a manipulation of the argument data results in
  os com…
severity: critical
cvss: 10
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H/E:P/RL:X/RC:R'
cvssSource: cna
cwe:
  - CWE-78
  - CWE-77
vendor: WAVLINK
product: WN551X3-A
affected:
  - WN551X3-A M51X3_V251020-WO-182e965
ssvc:
  exploitation: poc
  automatable: 'yes'
  technicalImpact: total
  timestamp: '2026-11-05T21:30:00.938829Z'
exploitAvailable: true
published: '2026-11-02'
updated: '2026-11-05'
sourceUpdated: '2026-11-05T21:30:24.203Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120345'
references:
  - url: 'https://vuldb.com/vuln/429670'
    label: >-
      VDB-429670 | WAVLINK WN551X3-A DNS Resolution ioos sub_41a430 os command
      injection
  - url: 'https://vuldb.com/vuln/429670/cti'
    label: 'VDB-429670 | CTI Indicators (IOB, IOC, TTP, IOA)'
  - url: 'https://vuldb.com/cve/CVE-2026-120345'
    label: CVE-2026-120345 | CVE Analysis and Report
  - url: 'https://vuldb.com/submit/919579'
    label: >-
      Submit #919579 | Wavlink Router Firmware WN551X3-A-M51X3_V251020-WO
      Command Injection
  - url: >-
      https://github.com/senxitoyshuyi-ui/HACKALL/blob/main/WAVLINK_WN551X3-A%20Router/WAVLINK_WN551X3-A_dns_resolution_command_injection.md
tags:
  - cve.org
  - exploit-available
epss: 0.01989
epssPercentile: 0.80709
ingestedAt: '2026-11-05T19:30:42.623Z'
---

## Overview

A vulnerability was found in WAVLINK WN551X3-A M51X3_V251020-WO-182e965. This impacts the function sub_41a430 of the file /bin/ioos of the component DNS Resolution Handler. Performing a manipulation of the argument data results in os command injection. It is possible to initiate the attack remotely. The exploit has been made public and could be used. The vendor was contacted early about this disclosure.

## Affected

- `WN551X3-A M51X3_V251020-WO-182e965`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.