Buffer Overflow Vulnerability in Wavlink WL-NU516U1 Device
CVE-2026-2566

8.6HIGH

Key Information:

Vendor

Wavlink

Status
Wl-nu516u1
Vendor
CVE Published:
16 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2566?

A stack-based buffer overflow vulnerability has been identified in the Wavlink WL-NU516U1 device, specifically within the handling of the firmware_url argument in the /cgi-bin/adm.cgi file. This flaw potentially allows remote attackers to execute arbitrary code by manipulating the input parameters. The public disclosure of this exploit presents severe risks, highlighting the need for immediate attention and remediation measures by users of the affected device. Despite early notification, the vendor has not provided any response to address this serious issue.

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Affected Version(s)

WL-NU516U1 130

WL-NU516U1 260

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-2026-2566 - Proof of Concept

References

https://vuldb.com/?id.346173
vdb-entrytechnical-description
https://vuldb.com/?ctiid.346173
signaturepermissions-required
https://vuldb.com/?submit.751908
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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