Stack-Based Buffer Overflow in Tenda W3 Router by Tenda
CVE-2026-3976

8.7HIGH

Key Information:

Vendor

Tenda
Status
W3
Vendor
CVE Published:
12 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3976?

A vulnerability in the Tenda W3 router allows attackers to exploit the function formWifiMacFilterSet in the POST Parameter Handler. By manipulating the argument index/GO via a specially crafted request, a stack-based buffer overflow can occur. This flaw could be exploited remotely, making it essential for users to apply security updates or consider mitigating measures to protect their devices from potential attacks. The exploit has been shared publicly, heightening the need for vigilance in securing network configurations.

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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-2026-3976 - Proof of Concept

References

https://vuldb.com/?id.350411
vdb-entrytechnical-description
https://vuldb.com/?ctiid.350411
signaturepermissions-required
https://vuldb.com/?submit.769179
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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