Stack-Based Buffer Overflow in Wavlink WL-NU516U1
CVE-2026-3613

8.6HIGH

Key Information:

Vendor

Wavlink

Status
Wl-nu516u1
Vendor
CVE Published:
6 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3613?

A stack-based buffer overflow vulnerability exists in the Wavlink WL-NU516U1 V240425 product. This issue is found within the sub_401A0C function of the /cgi-bin/login.cgi file. By manipulating the ipaddr argument, an attacker can exploit this vulnerability remotely, potentially leading to unauthorized access or control of the affected device. The exploit has been made publicly available, highlighting the urgency for users to implement necessary security measures. Early communication with the vendor regarding this vulnerability indicates awareness and the potential for future patches or mitigations.

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Affected Version(s)

WL-NU516U1 V240425

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-2026-3613 - Proof of Concept

References

https://vuldb.com/?id.349221
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349221
signaturepermissions-required
https://vuldb.com/?submit.755341
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)
VulDB
JSON
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