Stack-Based Buffer Overflow in Tenda W3 Router
CVE-2026-3974

8.7HIGH

Key Information:

Vendor

Tenda
Status
W3
Vendor
CVE Published:
12 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3974?

A security vulnerability in the Tenda W3 router versions 1.0.0.3(2204) has been identified, specifically in the formexeCommand function within the HTTP Handler component. This flaw arises from improper handling of the cmdinput argument, leading to a stack-based buffer overflow. Attackers can exploit this vulnerability remotely, and the exploit code is available publicly, raising significant security concerns for users of this router model.

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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-2026-3974 - Proof of Concept

References

https://vuldb.com/?id.350409
vdb-entrytechnical-description
https://vuldb.com/?ctiid.350409
signaturepermissions-required
https://vuldb.com/?submit.769177
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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