From the screenshot, the following key information about the vulnerability can be obtained: 1. Vulnerability Overview Description: TOTOLINK A3700R V9.1.2u.6165_202111012 contains a stack overflow vulnerability. Firmware Download Link: Download Link Manufacturer Information: Official Website 2. Product Information Device Model: TOTOLINK A3700R V9.1.2u.6165_202111012 Router. Latest Firmware Version: Released on November 12, 2021. 3. Vulnerability Details Function Name: Relevant Code: Issue: is a stack-based variable, and is user-controllable. The function causes a stack overflow. 4. Vulnerability Reproduction and POC To reproduce the vulnerability, follow these steps: Boot Firmware: Use qemu-system or another method (or real hardware) to boot the firmware. Use the following POC attack: 5. POC Attack Effect The attached image shows the effect of the POC attack, where the PC register is hijacked. 6. Additional Information