---
id: CVE-2026-13539
title: A vulnerability was identified in Wavlink WL-NU516U1-A M16U1_V240425
summary: >-
  A vulnerability was identified in Wavlink WL-NU516U1-A M16U1_V240425. The
  impacted element is the function sub_407504 of the file /cgi-bin/wireless.cgi
  of the component POST Parameter Handler. Such manipulation of the argument
  Guest_ssid…
severity: high
cvss: 8.8
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H'
cwe:
  - CWE-119
  - CWE-121
published: '2026-06-29'
updated: '2026-06-29'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-13539'
references:
  - url: >-
      https://dl.wavlink.com/firmware/RD/WINSTAR_NU516U1-WO-A-2026-06-22-5ccde97-mt7628-squashfs-sysupgrade.bin
    label: cna@vuldb.com
  - url: >-
      https://github.com/Svigo-o/Wavlink_vul/tree/main/wavlink-wl-nu516u1-wireless-guestwifi-guestssid-buffer-overflow
    label: cna@vuldb.com
  - url: 'https://vuldb.com/cve/CVE-2026-13539'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/submit/834024'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/374547'
    label: cna@vuldb.com
  - url: 'https://vuldb.com/vuln/374547/cti'
    label: cna@vuldb.com
tags:
  - nvd
ingestedAt: '2026-06-29T13:42:12.361Z'
epss: 0.00854
epssPercentile: 0.56549
---

## Overview

A vulnerability was identified in Wavlink WL-NU516U1-A M16U1_V240425. The impacted element is the function sub_407504 of the file /cgi-bin/wireless.cgi of the component POST Parameter Handler. Such manipulation of the argument Guest_ssid leads to stack-based buffer overflow. The attack can be executed remotely. The exploit is publicly available and might be used. It is suggested to upgrade the affected component. The vendor was contacted early, responded in a very professional manner and quickly released a fixed version of the affected product.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.