Stack-based Buffer Overflow in Tenda i12 Wireless Router
CVE-2026-4042

8.7HIGH

Key Information:

Vendor

Tenda
Status
I12
Vendor
CVE Published:
12 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4042?

A vulnerability in the Tenda i12 wireless router allows for a stack-based buffer overflow through the formWifiMacFilterGet function located in the /goform/WifiMacFilterGet file. This weakness could be exploited remotely, enabling potential attackers to manipulate index arguments. The exploit has been publicly documented, increasing the risk of unauthorized access and control over the affected device. Users are advised to take immediate steps to secure their devices.

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Affected Version(s)

i12 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-2026-4042 - Proof of Concept

References

https://vuldb.com/?id.350654
vdb-entrytechnical-description
https://vuldb.com/?ctiid.350654
signaturepermissions-required
https://vuldb.com/?submit.769463
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

Jimi (VulDB User)
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