cve/2020/CVE-2020-13391.md

### [CVE-2020-13391](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-13391)
![](https://img.shields.io/static/v1?label=Product&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=n%2Fa&color=brighgreen)

### Description

An issue was discovered on Tenda AC6 V1.0 V15.03.05.19_multi_TD01, AC9 V1.0 V15.03.05.19(6318)_CN, AC9 V3.0 V15.03.06.42_multi, AC15 V1.0 V15.03.05.19_multi_TD01, and AC18 V15.03.05.19(6318_)_CN devices. There is a buffer overflow vulnerability in the router's web server -- httpd. While processing the /goform/SetSpeedWan speed_dir parameter for a POST request, a value is directly used in a sprintf to a local variable placed on the stack, which overwrites the return address of a function. An attacker can construct a payload to carry out arbitrary code execution attacks.

### POC

#### Reference
- https://joel-malwarebenchmark.github.io
- https://joel-malwarebenchmark.github.io
- https://joel-malwarebenchmark.github.io/blog/2020/04/28/cve-2020-13391-Tenda-vulnerability/
- https://joel-malwarebenchmark.github.io/blog/2020/04/28/cve-2020-13391-Tenda-vulnerability/

#### Github
No PoCs found on GitHub currently.