Buffer Overflow Vulnerability in Wavlink WL-NU516U1 Devices
CVE-2026-2567

8.6HIGH

Key Information:

Vendor

Wavlink

Status
Wl-nu516u1
Vendor
CVE Published:
16 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2567?

The Wavlink WL-NU516U1 device exhibits a stack-based buffer overflow vulnerability in the /cgi-bin/nas.cgi file's function sub_401218. An attacker can exploit this flaw by manipulating the User1Passwd argument, which may lead to unauthorized access or potential control over the affected system. The vulnerability is publicly known, making the device susceptible to remote attacks, emphasizing the necessity for immediate awareness and remediation measures.

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Affected Version(s)

WL-NU516U1 20251208

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-2026-2567 - Proof of Concept

References

https://vuldb.com/?id.346174
vdb-entrytechnical-description
https://vuldb.com/?ctiid.346174
signaturepermissions-required
https://vuldb.com/?submit.752016
third-party-advisory

CVSS V4

Score:
8.6
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

haimianbaobao (VulDB User)
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