### [CVE-2021-3733](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-3733)
![](https://img.shields.io/static/v1?label=Product&message=python&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-400%20-%20Uncontrolled%20Resource%20Consumption&color=brighgreen)

### Description

There's a flaw in urllib's AbstractBasicAuthHandler class. An attacker who controls a malicious HTTP server that an HTTP client (such as web browser) connects to, could trigger a Regular Expression Denial of Service (ReDOS) during an authentication request with a specially crafted payload that is sent by the server to the client. The greatest threat that this flaw poses is to application availability.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/engn33r/awesome-redos-security