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CVE-2026-13539— Wavlink WL-NU516U1-A POST Parameter wireless.cgi sub_407504 stack-based overflow

Quick assessment

Affected
Wavlink WL-NU516U1-A
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

WAVLINK wl-nu516u1-a是中国WAVLINK公司的一款高性能无线路由器。 Wavlink WL-NU516U1-A M16U1_V240425版本存在缓冲区错误漏洞，该漏洞源于POST参数处理器组件中文件/cgi-bin/wireless.cgi的函数sub_407504对参数Guest_ssid的操作，导致栈缓冲区溢出。攻击者可远程执行攻击。

CVSS 8.8 · High EPSS 0.85% · P58

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
Wavlink WL-NU516U1-A M16U1_V240425 affected
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I. Basic Information for CVE-2026-13539

Vulnerability Information
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Vulnerability Title
Wavlink WL-NU516U1-A POST Parameter wireless.cgi sub_407504 stack-based overflow
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
栈缓冲区溢出
Source: CVE Program / CVE List V5
Vulnerability Title
WAVLINK wl-nu516u1-a 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
WAVLINK wl-nu516u1-a是中国WAVLINK公司的一款高性能无线路由器。 Wavlink WL-NU516U1-A M16U1_V240425版本存在缓冲区错误漏洞，该漏洞源于POST参数处理器组件中文件/cgi-bin/wireless.cgi的函数sub_407504对参数Guest_ssid的操作，导致栈缓冲区溢出。攻击者可远程执行攻击。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Wavlink WL-NU516U1-A M16U1_V240425 cpe:2.3:a:wavlink:wl-nu516u1-a:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-13539

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 5662 chars
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III. Intelligence Information for CVE-2026-13539

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Proof of Concept for CVE-2026-13539 (1)

Other References for CVE-2026-13539 (1)

IV. Related Vulnerabilities

Same product: WL-NU516U1-A
Same vendor: Wavlink
Same weakness: CWE-121

V. Comments for CVE-2026-13539

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