Stack-Based Buffer Overflow in Wavlink WL-NU516U1-A Vulnerable Component
CVE-2026-13539

8.7HIGH

Key Information:

Vendor

Wavlink

Status
Wl-nu516u1-a
Vendor
CVE Published:
29 June 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-13539?

A stack-based buffer overflow vulnerability was discovered in the Wavlink WL-NU516U1-A device's POST parameter handler, specifically within the function sub_407504 of the /cgi-bin/wireless.cgi file. Attackers can exploit this vulnerability remotely by manipulating the Guest_ssid argument, leading to potential unauthorized access and system instability. Affected users are urged to update to the patched version released by Wavlink to mitigate risks and enhance security.

Affected Version(s)

WL-NU516U1-A M16U1_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-2026-13539 - Proof of Concept

References

https://vuldb.com/vuln/374547
vdb-entrytechnical-description
https://vuldb.com/vuln/374547/cti
signaturepermissions-required
https://vuldb.com/cve/CVE-2026-13539
third-party-advisory

CVSS V4

Score:
8.7
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

JuneGu (VulDB User)
VulDB CNA Team
.