OS Command Injection Vulnerability in Wavlink NU516U1 Router
CVE-2026-8189

5.3MEDIUM

Key Information:

Vendor

Wavlink

Status
Nu516u1
Vendor
CVE Published:
9 May 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-8189?

A vulnerability exists in the Wavlink NU516U1 router related to the wzdrepeater function in /cgi-bin/adm.cgi. The flaw arises from improper handling of input parameters, specifically wlan_bssid, sel_Automode, and sel_EncrypTyp, allowing remote attackers to execute arbitrary OS commands. This security issue poses a significant risk as it can be exploited without authentication. Immediate action is advised to prevent unauthorized access and potential exploitation.

Affected Version(s)

NU516U1 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-2026-8189 - Proof of Concept

References

https://vuldb.com/vuln/362341
vdb-entrytechnical-description
https://vuldb.com/vuln/362341/cti
signaturepermissions-required
https://vuldb.com/submit/800728
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
Low
Integrity:
Low
Availability:
Low
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

Ziyue Xie (VulDB User)
VulDB CNA Team
.