Stack-based Buffer Overflow in Tenda W3 Router
CVE-2026-4008

8.7HIGH

Key Information:

Vendor

Tenda
Status
W3
Vendor
CVE Published:
12 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4008?

A security flaw has been identified in the Tenda W3 router, specifically in the POST Parameter Handler, located at /goform/wifiSSIDset. This vulnerability allows for a stack-based buffer overflow due to improper processing of input arguments, notably index and GO. An attacker with remote access can exploit this vulnerability, potentially leading to unauthorized code execution and system compromise. The exploit details are publicly available, emphasizing the need for users to secure their devices.

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Affected Version(s)

W3 1.0.0.3(2204)

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-2026-4008 - Proof of Concept

References

https://vuldb.com/?id.350531
vdb-entrytechnical-description
https://vuldb.com/?ctiid.350531
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https://vuldb.com/?submit.769182
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

Svigo_o (VulDB User)
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