CVEs-PoC/2021/CVE-2021-22904.md

### [CVE-2021-22904](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22904)
![](https://img.shields.io/static/v1?label=Product&message=https%3A%2F%2Fgithub.com%2Frails%2Frails&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=Fixed%20in%206.1.3.2%2C%206.0.3.7%2C%205.2.4.6%2C%205.2.6%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Denial%20of%20Service%20(CWE-400)&color=brightgreen)

### Description

The actionpack ruby gem before 6.1.3.2, 6.0.3.7, 5.2.4.6, 5.2.6 suffers from a possible denial of service vulnerability in the Token Authentication logic in Action Controller due to a too permissive regular expression. Impacted code uses `authenticate_or_request_with_http_token` or `authenticate_with_http_token` for request authentication.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/20142995/nuclei-templates
- https://github.com/amakhu/cdp
- https://github.com/cyb3r-w0lf/nuclei-template-collection