CVE-2026-3802
Received Received - Intake
Stack-Based Buffer Overflow in Tenda i3 Remote Command Execution

Publication date: 2026-03-09

Last updated on: 2026-03-09

Assigner: VulDB

Description
A vulnerability was determined in Tenda i3 1.0.0.6(2204). Affected by this issue is the function formexeCommand of the file /goform/exeCommand. Executing a manipulation of the argument cmdinput can lead to stack-based buffer overflow. The attack may be performed from remote. The exploit has been publicly disclosed and may be utilized.
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Meta Information
Published
2026-03-09
Last Modified
2026-03-09
Generated
2026-06-16
AI Q&A
2026-03-09
EPSS Evaluated
2026-06-15
NVD
CVE-2026-3802
EUVD
EUVD-2026-10296
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
tenda i3_firmware 1.0.0.6(2204)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-119 The product performs operations on a memory buffer, but it reads from or writes to a memory location outside the buffer's intended boundary. This may result in read or write operations on unexpected memory locations that could be linked to other variables, data structures, or internal program data.
CWE-121 A stack-based buffer overflow condition is a condition where the buffer being overwritten is allocated on the stack (i.e., is a local variable or, rarely, a parameter to a function).
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Executive Summary

CVE-2026-3802 is a stack-based buffer overflow vulnerability found in the Tenda i3 router, version 1.0.0.6(2204). It exists in the function formexeCommand within the /goform/exeCommand endpoint. The vulnerability occurs because the cmdinput parameter is not properly validated for length, allowing an attacker to send a specially crafted HTTP POST request with an excessively long cmdinput value.

This buffer overflow can cause the device to behave unexpectedly, potentially allowing an attacker to execute arbitrary code or cause a denial of service on the affected router.

Impact Analysis

Exploitation of this vulnerability can lead to serious impacts including arbitrary code execution and denial of service on the affected Tenda i3 router.

  • Arbitrary code execution could allow an attacker to take control of the device remotely.
  • Denial of service could disrupt network connectivity by crashing or destabilizing the router.

Since the vulnerability can be exploited remotely without authentication, it poses a high risk to the confidentiality, integrity, and availability of the device and potentially the network it supports.

Compliance Impact

I don't know

Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by sending a crafted HTTP POST request to the /goform/exeCommand endpoint of the Tenda i3 router, specifically targeting the cmdinput parameter with an excessively long payload to trigger the buffer overflow.'}, {'type': 'paragraph', 'content': 'A detection command example involves using curl to send a POST request with a large cmdinput value to test for the vulnerability:'}, {'type': 'list_item', 'content': 'curl -X POST http://<router-ip>/goform/exeCommand -d "cmdinput=$(python3 -c \'print("A"*1000)\')"'}, {'type': 'paragraph', 'content': 'Replace <router-ip> with the IP address of the target device. If the device is vulnerable, this request may cause a crash or unexpected behavior indicating the buffer overflow.'}] [1, 2, 3]

Mitigation Strategies

Currently, no known countermeasures or mitigations have been identified for this vulnerability.

The recommended immediate step is to replace the affected Tenda i3 device with an alternative product to avoid exploitation.

Additionally, restricting remote access to the device and monitoring for suspicious POST requests to /goform/exeCommand may help reduce exposure until replacement.

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