Buffer Overflow Vulnerability in Tenda i3 Router Software
CVE-2026-3801

8.7HIGH

Key Information:

Vendor

Tenda
Status
I3
Vendor
CVE Published:
9 March 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-3801?

A buffer overflow vulnerability exists in the Tenda i3 router within the formSetAutoPing function found in the /goform/setAutoPing file. By manipulating the ping1 or ping2 arguments, an attacker can trigger a stack-based buffer overflow. This vulnerability can be exploited remotely, allowing unauthorized access and control over the device. It is crucial for users to update their firmware to mitigate potential exploitation risks. Details of the vulnerability have been made public, increasing the urgency for security measures.

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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-2026-3801 - Proof of Concept

References

https://vuldb.com/?id.349768
vdb-entrytechnical-description
https://vuldb.com/?ctiid.349768
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https://vuldb.com/?submit.768980
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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