OS Command Injection Vulnerability in WAVLINK Router Firmware
CVE-2026-120239

9.4CRITICAL

Key Information:

Vendor

Wavlink

Status
Wn553x1-b
Vendor
CVE Published:
1 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-120239?

A security flaw in the WAVLINK WN553X1-B router's firmware version V260403_2.0.0 allows remote attackers to execute arbitrary commands via manipulated arguments in the WireGuard CLI Handler. Specifically, the defect resides in the sub_419DA8 function of the /bin/ioos file, facilitating OS command injection. This vulnerability has been publicly identified, prompting the vendor to be notified of the issue prior to its disclosure.

Affected Version(s)

WN553X1-B V260403_2.0.0

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-2026-120239 - Proof of Concept

References

https://vuldb.com/vuln/429598
vdb-entrytechnical-description
https://vuldb.com/vuln/429598/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-120239
third-party-advisory

CVSS V4

Score:
9.4
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

shuyi (VulDB User)
VulDB CNA Team
.