Stack-Based Buffer Overflow in Tenda i3 Wi-Fi Router
CVE-2026-3971

8.7HIGH

Key Information:

Vendor

Tenda
Status
I3
Vendor
CVE Published:
12 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3971?

A stack-based buffer overflow vulnerability has been identified in the Tenda i3 router, specifically within the formwrlSSIDset function of the /goform/wifiSSIDset file. This vulnerability arises from improper handling of the index/GO argument, which may allow attackers to execute remote exploits. Given that the exploit has been publicly disclosed, it poses a significant risk to users of the affected version.

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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-2026-3971 - Proof of Concept

References

https://vuldb.com/?id.350406
vdb-entrytechnical-description
https://vuldb.com/?ctiid.350406
signaturepermissions-required
https://vuldb.com/?submit.768996
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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