Stack-Based Buffer Overflow in WAVLINK WN536AX6-A OpenVPN Handler
CVE-2026-120281

10CRITICAL

Key Information:

Vendor

Wavlink

Status
Wn536ax6-a
Vendor
CVE Published:
2 November 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-120281?

A security weakness has been identified in the WAVLINK WN536AX6-A router affecting the OpenVPN Handler within the file /protocol.csp. Due to improper handling of the 'openvpn_ip' argument in the strcpy function, a stack-based buffer overflow can occur, leading to potential exploitation by remote attackers. This vulnerability has been made public, and users are advised to apply necessary mitigations as the vendor has been notified regarding this issue.

Affected Version(s)

WN536AX6-A V260507

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-2026-120281 - Proof of Concept

References

https://vuldb.com/vuln/429625
vdb-entrytechnical-description
https://vuldb.com/vuln/429625/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-120281
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

yyjy (VulDB User)
VulDB CNA Team
.