Stack-based Buffer Overflow in Tenda i12 by Tenda
CVE-2026-4043

8.7HIGH

Key Information:

Vendor

Tenda
Status
I12
Vendor
CVE Published:
12 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-4043?

A security vulnerability has been identified in Tenda i12 firmware version 1.0.0.6(2204). This vulnerability arises from improper handling of the index parameter in the 'formwrlSSIDget' function within the '/goform/wifiSSIDget' file. An attacker can exploit this weakness to achieve a stack-based buffer overflow, which may lead to unauthorized access or control over the device. The vulnerability can be triggered remotely, posing significant security risks if left unaddressed. Publicly disclosed, this exploit highlights the urgent need for users to update their devices and monitor for potential attacks.

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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-2026-4043 - Proof of Concept

References

https://vuldb.com/?id.350655
vdb-entrytechnical-description
https://vuldb.com/?ctiid.350655
signaturepermissions-required
https://vuldb.com/?submit.769464
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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