Stack-based Buffer Overflow in Wavlink Routers
CVE-2026-18607

8.7HIGH

Key Information:

Vendor

Wavlink

Status
Wn572
Wn570h
Wn573
Wn529
Vendor
CVE Published:
3 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-18607?

A security vulnerability has been identified in several Wavlink routers where a stack-based buffer overflow occurs in the upload.cgi file due to improper handling of the HTTP_COOKIE argument in the strcpy function. This flaw allows an attacker to remotely execute an exploit, which could lead to unauthorized access or control of the affected devices. The implicated routers include models WN572, WN570H, WN573, WN529, WN530, WN531, WN535, and more, up to the firmware version released on June 9, 2026. As this vulnerability has been publicly disclosed, users are advised to take immediate actions to secure their devices.

Affected Version(s)

etc. WN529 20260609

NU516 20260609

WN529 20260609

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-2026-18607 - Proof of Concept

References

https://vuldb.com/vuln/385530
vdb-entrytechnical-description
https://vuldb.com/vuln/385530/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-18607
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
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

0xcc12138 (VulDB User)
.