Stack-Based Buffer Overflow in Wavlink WL-WN579X3-C Router
CVE-2026-5004

8.7HIGH

Key Information:

Vendor

Wavlink

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

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5004?

A stack-based buffer overflow vulnerability exists in the Wavlink WL-WN579X3-C router, specifically in the function sub_4019FC located in the /cgi-bin/firewall.cgi component responsible for UPNP handling. Manipulation of the 'UpnpEnabled' argument can lead to a potentially exploitative overflow condition. This vulnerability can be triggered remotely, posing a significant security risk. Despite prior notification, the vendor has not responded to address this issue. Public disclosure of the exploit means it could be actively utilized by malicious actors.

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Affected Version(s)

WL-WN579X3-C 231124

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-2026-5004 - Proof of Concept

References

https://vuldb.com/vuln/353891
vdb-entrytechnical-description
https://vuldb.com/vuln/353891/cti
signaturepermissions-required
https://vuldb.com/submit/779149
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

LtzHuster2 (VulDB User)
VulDB
JSON
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