Buffer Overflow Vulnerability in Tenda i3 Router by Tenda
CVE-2026-3799

8.7HIGH

Key Information:

Vendor

Tenda
Status
I3
Vendor
CVE Published:
9 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3799?

A vulnerability in the Tenda i3 router's firmware allows a stack-based buffer overflow due to inadequate input validation in the formSetCfm function. Exploiting this flaw via remote access could allow attackers to execute arbitrary code, leading to potential unauthorized access to the device. It is crucial for users to apply patches and follow security best practices to mitigate associated risks.

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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-2026-3799 - Proof of Concept

References

https://vuldb.com/?id.349766
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349766
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https://vuldb.com/?submit.768976
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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