cve/2021/CVE-2021-42756.md

### [CVE-2021-42756](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42756)
![](https://img.shields.io/static/v1?label=Product&message=FortiWeb&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=5.6.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=5.7.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=5.8.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=5.8.5%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=5.9.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=6.0.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=6.1.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=6.2.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=6.3.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=6.4.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Execute%20unauthorized%20code%20or%20commands&color=brightgreen)

### Description

Multiple stack-based buffer overflow vulnerabilities [CWE-121] in the proxy daemon of FortiWeb 5.x all versions, 6.0.7 and below, 6.1.2 and below, 6.2.6 and below, 6.3.16 and below, 6.4 all versions may allow an unauthenticated remote attacker to achieve arbitrary code execution via specifically crafted HTTP requests.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/20142995/nuclei-templates
- https://github.com/3ndorph1n/CVE-2021-42756
- https://github.com/ARPSyndicate/cvemon
- https://github.com/Threekiii/CVE
- https://github.com/cyb3r-w0lf/nuclei-template-collection