Stack-Based Buffer Overflow in Wavlink WL-WN579X3-C Network Device
CVE-2026-3715

8.7HIGH

Key Information:

Vendor

Wavlink

Status
Wl-wn579x3-c
Vendor
CVE Published:
8 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3715?

A vulnerability in the Wavlink WL-WN579X3-C network device has been identified, which allows for a stack-based buffer overflow via manipulation of the 'del_flag' argument in the 'sub_40139C' function of the 'firewall.cgi' file. This flaw can be exploited remotely, posing significant risks to network security. The vendor has proactively addressed this issue, and users are urged to upgrade to version 20260226 to mitigate potential risks.

Affected Version(s)

WL-WN579X3-C 231124

WL-WN579X3-C 20260226

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-2026-3715 - Proof of Concept

References

https://vuldb.com/?id.349660
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349660
signaturepermissions-required
https://vuldb.com/?submit.765325
third-party-advisory

CVSS V4

Score:
8.7
Severity:
HIGH
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

LtzHuster (VulDB User)
VulDB
.