Stack-Based Buffer Overflow in Tenda i3 Router
CVE-2026-3803

8.7HIGH

Key Information:

Vendor

Tenda
Status
I3
Vendor
CVE Published:
9 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3803?

A vulnerability exists in the Tenda i3 router version 1.0.0.6 (2204) related to the function formWifiMacFilterGet. An attacker can manipulate an argument index to trigger a stack-based buffer overflow. This exploit can be executed remotely, exposing the router to potential attacks. As details of the exploit are publicly available, users of affected versions should take immediate action to mitigate 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-2026-3803 - Proof of Concept

References

https://vuldb.com/?id.349770
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349770
signaturepermissions-required
https://vuldb.com/?submit.768984
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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