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.

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)
.