Stack-based Buffer Overflow in Tenda i12 Router
CVE-2026-5609

8.7HIGH

Key Information:

Vendor

Tenda
Status
I12
Vendor
CVE Published:
6 April 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-5609?

A security flaw has been identified in the Tenda i12 router, specifically affecting version 1.0.0.11(3862). The vulnerability arises from an improper handling of the formwrlSSIDset function within the /goform/wifiSSIDset component, which allows for a stack-based buffer overflow. An attacker can exploit this vulnerability remotely, potentially affecting the integrity of the device. Reports indicate that this exploit has been made public, emphasizing the necessity for users to implement the latest security patches and practices.

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Affected Version(s)

i12 1.0.0.11(3862)

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-2026-5609 - Proof of Concept

References

https://vuldb.com/vuln/355400
vdb-entrytechnical-description
https://vuldb.com/vuln/355400/cti
signaturepermissions-required
https://vuldb.com/submit/785337
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

LtzHust (VulDB User)
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