Compliance Impact

The provided information does not specify any direct impact of this vulnerability on compliance with common standards and regulations such as GDPR or HIPAA.

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Executive Summary

The CVE-2026-36813 vulnerability affects the Tenda W15E V15.11.0.10 router in the formCropAndSetWewifiPic function. It is caused by a buffer overflow in the picCropName parameter due to improper handling of this input.

An attacker can exploit this vulnerability by sending a crafted HTTP request with an excessively long picCropName value (for example, 888 or more 'a' characters) to the vulnerable CGI endpoint. This causes memory corruption when the parameter is processed using a sprintf command.

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Impact Analysis

Exploitation of this vulnerability can lead to a Denial of Service (DoS) condition. This means the affected device, such as the Tenda W15E router, could crash or become unstable, disrupting network connectivity and services.

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Detection Guidance

This vulnerability can be detected by sending a crafted HTTP request to the vulnerable CGI endpoint of the Tenda W15E router, specifically targeting the formCropAndSetWewifiPic function.

The detection involves using an HTTP request with an excessively long picCropName parameter value (for example, 888 or more 'a' characters) to trigger the buffer overflow.

A sample command to test this could be using curl as follows:

• curl -X POST "http://<router-ip>/cgi-bin/formCropAndSetWewifiPic" -d "picCropName=$(python3 -c 'print("a"*888)')"

If the device crashes, becomes unstable, or the service restarts after this request, it indicates the presence of the vulnerability.

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Mitigation Strategies

Immediate mitigation steps include avoiding exposure of the vulnerable CGI endpoint to untrusted networks and restricting access to the router's management interface.

Additionally, monitoring for unusual crashes or instability after receiving HTTP requests with long picCropName parameters can help detect exploitation attempts.

Applying any available firmware updates or patches from Shenzhen Tenda Technology Co., Ltd for the W15E router is recommended once released.

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