Stack-Based Buffer Overflow in Tenda i3 Router
CVE-2026-3804

8.7HIGH

Key Information:

Vendor

Tenda
Status
I3
Vendor
CVE Published:
9 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3804?

A security flaw has been identified in the Tenda i3 router version 1.0.0.6(2204), specifically within the function formWifiMacFilterSet located in the /goform/WifiMacFilterSet file. This vulnerability allows for manipulation of the argument index, leading to a stack-based buffer overflow condition. Attackers can potentially exploit this flaw to execute remote attacks, making it a significant concern for users aiming to secure their network. The details and exploit for this vulnerability have been publicly released, highlighting the urgency of addressing this issue.

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Affected Version(s)

i3 1.0.0.6(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-2026-3804 - Proof of Concept

References

https://vuldb.com/?id.349771
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349771
signaturepermissions-required
https://vuldb.com/?submit.768985
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 (VulDB User)
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