cve/2021/CVE-2021-36740.md

### [CVE-2021-36740](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-36740)
![](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

Varnish Cache, with HTTP/2 enabled, allows request smuggling and VCL authorization bypass via a large Content-Length header for a POST request. This affects Varnish Enterprise 6.0.x before 6.0.8r3, and Varnish Cache 5.x and 6.x before 6.5.2, 6.6.x before 6.6.1, and 6.0 LTS before 6.0.8.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/Casio-3/cn55spider
- https://github.com/aakindur/Awesome-Vulnerable-Apps
- https://github.com/detectify/Varnish-H2-Request-Smuggling
- https://github.com/edsimauricio/repo11
- https://github.com/mluzardo170464/DevSec
- https://github.com/nataliekenat/vulnerable
- https://github.com/pranay-TataCliq-infosec/test_repo
- https://github.com/vavkamil/awesome-vulnerable-apps