CVE-2026-4042
Received Received - Intake
Stack-Based Buffer Overflow in Tenda i12 WifiMacFilterGet

Publication date: 2026-03-12

Last updated on: 2026-04-02

Assigner: VulDB

Description
A weakness has been identified in Tenda i12 1.0.0.6(2204). The affected element is the function formWifiMacFilterGet of the file /goform/WifiMacFilterGet. This manipulation of the argument index causes stack-based buffer overflow. The attack may be initiated remotely. The exploit has been made available to the public and could be used for attacks.
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Meta Information
Published
2026-03-12
Last Modified
2026-04-02
Generated
2026-06-16
AI Q&A
2026-03-12
EPSS Evaluated
2026-06-15
NVD
CVE-2026-4042
EUVD
EUVD-2026-11589
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
tenda i12_firmware 1.0.0.6(2204)
Helpful Resources
Exploitability
CWE
CWE Icon
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).
CWE-787 The product writes data past the end, or before the beginning, of the intended buffer.
Attack-Flow Graph
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Executive Summary

[{'type': 'paragraph', 'content': 'CVE-2026-4042 is a stack-based buffer overflow vulnerability found in the Tenda i12 router firmware version 1.0.0.6(2204). It exists in the function formWifiMacFilterGet within the file /goform/WifiMacFilterGet. The vulnerability occurs because the function processes user-supplied parameters, specifically "wl_radio" and "index", without proper bounds checking. When "wl_radio" is set to a value other than 0, a variable is passed to the sprintf function without validating its length, causing the stack buffer to overflow.'}, {'type': 'paragraph', 'content': 'This flaw allows an attacker to remotely send crafted requests to the device, potentially causing a denial of service (DoS) or enabling remote code execution by exploiting the memory corruption.'}] [1, 2, 3]

Impact Analysis

This vulnerability can have severe impacts including denial of service (DoS), where the device may crash or become unresponsive, and remote code execution, where an attacker could run arbitrary code on the affected router remotely.

Because the exploit can be triggered remotely without requiring physical or local access, it poses a significant security risk to the confidentiality, integrity, and availability of the device and the network it supports.

There are currently no known mitigations or patches, making affected devices vulnerable until replaced or otherwise protected.

Compliance Impact

I don't know

Detection Guidance

[{'type': 'paragraph', 'content': 'This vulnerability can be detected by sending crafted HTTP POST requests to the /goform/WifiMacFilterGet endpoint of the Tenda i12 router firmware version 1.0.0.6(2204). Specifically, a POST request with the parameter wl_radio set to a value other than 0 and a large or malformed value in the index parameter can trigger the stack-based buffer overflow.'}, {'type': 'paragraph', 'content': 'A detection command example using curl could be:'}, {'type': 'list_item', 'content': 'curl -X POST http://<target-ip>/goform/WifiMacFilterGet -d "wl_radio=1&index=AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA"'}, {'type': 'paragraph', 'content': 'If the device crashes, becomes unresponsive, or behaves abnormally after this request, it indicates the presence of the vulnerability.'}] [3]

Mitigation Strategies

Currently, there are no known vendor-provided patches or mitigations for this vulnerability.

Immediate mitigation steps include:

  • Restrict remote access to the affected device to trusted networks only, to reduce exposure.
  • Monitor network traffic for suspicious POST requests targeting /goform/WifiMacFilterGet with unusual parameters.
  • Consider replacing the affected Tenda i12 router with an alternative device that is not vulnerable.
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