Buffer Overflow Vulnerability in Wavlink Network Devices
CVE-2026-74843

10CRITICAL

Key Information:

Vendor

Wavlink

Status
Wn531p3
Wn535m1
Vendor
CVE Published:
17 August 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-74843?

A security vulnerability exists in Wavlink network devices WN531P3 and WN535M1 due to improper handling of the HTTP_COOKIE argument within the export_pingortrace.cgi script. This flaw can be exploited remotely, leading to a stack-based buffer overflow, thereby allowing an attacker to potentially execute arbitrary code. The issue was disclosed publicly, and effective mitigation strategies should be implemented to safeguard affected systems.

Affected Version(s)

WN531P3 V250922

WN535M1 V250922

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-2026-74843 - Proof of Concept

References

https://vuldb.com/vuln/391205
vdb-entrytechnical-description
https://vuldb.com/vuln/391205/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-74843
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

world5 (VulDB User)
VulDB CNA Team
.