OS Command Injection Vulnerability in WAVLINK DNS Resolution Handler
CVE-2026-120345

10CRITICAL

Key Information:

Vendor

Wavlink

Status
Wn551x3-a
Vendor
CVE Published:
2 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-120345?

A vulnerability has been identified in WAVLINK's WN551X3-A, affecting its DNS Resolution Handler component. This security flaw allows remote attackers to inject arbitrary OS commands by manipulating argument data in the function sub_41a430 located in the /bin/ioos file. The issue has been made public, and the exploitation of this vulnerability could compromise the integrity of the system. Early disclosure was communicated to the vendor for prompt action.

Affected Version(s)

WN551X3-A M51X3_V251020-WO-182e965

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-120345 - Proof of Concept

References

https://vuldb.com/vuln/429670
vdb-entrytechnical-description
https://vuldb.com/vuln/429670/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-120345
third-party-advisory

CVSS V4

Score:
10
Severity:
CRITICAL
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

llsss (VulDB User)
VulDB CNA Team
.