Out-of-Bounds Write Vulnerability in Wavlink NU516U1 Router
CVE-2026-3703

9.3CRITICAL

Key Information:

Vendor

Wavlink

Status
Nu516u1
Vendor
CVE Published:
8 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3703?

A vulnerability has been identified in the Wavlink NU516U1 router that stems from a flaw in the 'sub_401A10' function within the '/cgi-bin/login.cgi' file. This vulnerability allows remote attackers to manipulate the 'ipaddr' argument, potentially leading to an out-of-bounds write condition. Such an exploit could allow unauthorized access or further compromise the device's integrity. It is highly recommended for users to upgrade to the latest firmware version released by Wavlink, which addresses the flaw effectively.

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Affected Version(s)

NU516U1 251208

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-2026-3703 - Proof of Concept

References

https://vuldb.com/?id.349649
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349649
signaturepermissions-required
https://vuldb.com/?submit.759226
third-party-advisory

CVSS V4

Score:
9.3
Severity:
CRITICAL
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

haimianbaobao (VulDB User)
VulDB
JSON
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