Stack-based Buffer Overflow in Wavlink WL-NU516U1 Product
CVE-2026-2565

7.5HIGH

Key Information:

Vendor

Wavlink

Status
Wl-nu516u1
Vendor
CVE Published:
16 February 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-2565?

A stack-based buffer overflow vulnerability has been identified in the Wavlink WL-NU516U1 device specifically in the function sub_40785C located in /cgi-bin/adm.cgi. This flaw arises from improper handling of the time_zone argument, enabling remote attackers to potentially exploit the affected system. While the complexity of executing the attack is considered high, public exploits are available, increasing the risk to users. Despite prior notice to the vendor regarding this issue, there was no response, leaving the vulnerability unaddressed.

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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-2026-2565 - Proof of Concept

References

https://vuldb.com/?id.346172
vdb-entrytechnical-description
https://vuldb.com/?ctiid.346172
signaturepermissions-required
https://vuldb.com/?submit.751133
third-party-advisory

CVSS V4

Score:
7.5
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
High
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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