Command Injection Vulnerability in Wavlink WL-NU516U1 Product
CVE-2026-3661

5.1MEDIUM

Key Information:

Vendor

Wavlink

Status
Wl-nu516u1
Vendor
CVE Published:
7 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3661?

A command injection vulnerability exists in the Wavlink WL-NU516U1 device, specifically within the ota_new_upgrade function located in the /cgi-bin/adm.cgi file. An attacker can manipulate the 'model' argument to execute arbitrary commands remotely, posing a significant risk of unauthorized access and control. This exploit has been publicly disclosed, highlighting the urgent need for users to apply the necessary security measures.

Affected Version(s)

WL-NU516U1 240425

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-2026-3661 - Proof of Concept

References

https://vuldb.com/?id.349550
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349550
signaturepermissions-required
https://vuldb.com/?submit.758227
third-party-advisory

CVSS V4

Score:
5.1
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

allanp0e (VulDB User)
VulDB
.