Stack-Based Buffer Overflow in Tenda i3 by Tenda
CVE-2026-3970

8.7HIGH

Key Information:

Vendor

Tenda
Status
I3
Vendor
CVE Published:
12 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3970?

A vulnerability was discovered in the Tenda i3 router, specifically within the formwrlSSIDget function of the /goform/wifiSSIDget file. This flaw allows for a stack-based buffer overflow that is exploitable by manipulating the argument index, potentially enabling remote attackers to execute arbitrary code on the device. The exploit has been publicly disclosed, putting users at risk if appropriate mitigations are not implemented.

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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-2026-3970 - Proof of Concept

References

https://vuldb.com/?id.350405
vdb-entrytechnical-description
https://vuldb.com/?ctiid.350405
signaturepermissions-required
https://vuldb.com/?submit.768995
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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