CVE-2026-5609
Received Received - Intake
Remote Stack-Based Buffer Overflow in Tenda i12 Parameter Handler

Publication date: 2026-04-06

Last updated on: 2026-04-30

Assigner: VulDB

Description
A flaw has been found in Tenda i12 1.0.0.11(3862). Affected by this vulnerability is the function formwrlSSIDset of the file /goform/wifiSSIDset of the component Parameter Handler. This manipulation of the argument index/wl_radio causes stack-based buffer overflow. It is possible to initiate the attack remotely. The exploit has been published and may be used.
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Meta Information
Published
2026-04-06
Last Modified
2026-04-30
Generated
2026-06-16
AI Q&A
2026-04-06
EPSS Evaluated
2026-06-14
NVD
CVE-2026-5609
EUVD
EUVD-2026-19148
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
tenda i12_firmware 1.0.0.11(3862)
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-2026-5609 is a stack-based buffer overflow vulnerability found in the Tenda i12 device firmware version 1.0.0.11(3862). It occurs in the function formwrlSSIDset within the HTTP daemon when processing user-supplied parameters "index" and "wl_radio". Specifically, if the "wl_radio" parameter is set to 0, a variable is passed to the sprintf function without length validation, causing an overflow of a stack buffer named s__2.

An attacker can exploit this vulnerability remotely by sending a crafted HTTP POST request to the /goform/wifiSSIDset endpoint with "wl_radio=0" and an excessively long "index" parameter. This can lead to denial of service or remote code execution.

Impact Analysis

This vulnerability can have serious impacts including denial of service (DoS) and remote code execution (RCE). An attacker exploiting this flaw can crash the device or execute arbitrary code remotely, potentially taking control of the affected Tenda i12 device.

Detection Guidance

This vulnerability can be detected by monitoring for suspicious HTTP POST requests targeting the /goform/wifiSSIDset endpoint on Tenda i12 devices running firmware version V1.0.0.11(3862). Specifically, look for POST requests where the parameter "wl_radio" is set to 0 and the "index" parameter contains an unusually long string, which may trigger the stack-based buffer overflow.

A practical detection method is to capture and analyze HTTP traffic to identify such crafted requests.

Example command using curl to test if the device is vulnerable by sending a crafted POST request:

  • curl -X POST http://[device_ip]/goform/wifiSSIDset -d "wl_radio=0&index=$(python3 -c 'print("A"*1000)')"

Network intrusion detection systems (NIDS) can be configured to alert on HTTP POST requests to /goform/wifiSSIDset with the parameter wl_radio=0 and unusually long index values.

Mitigation Strategies

Immediate mitigation steps include:

  • Restrict access to the affected device's management interface, especially blocking external HTTP POST requests to the /goform/wifiSSIDset endpoint.
  • Apply any available firmware updates from Tenda that address this vulnerability.
  • If firmware updates are not available, consider disabling remote management or isolating the device from untrusted networks.
  • Monitor network traffic for suspicious POST requests targeting /goform/wifiSSIDset with parameters that could exploit the vulnerability.
Compliance Impact

The provided information does not specify how the vulnerability CVE-2026-5609 affects compliance with common standards and regulations such as GDPR or HIPAA.

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