CVEs-PoC/2021/CVE-2021-27292.md

### [CVE-2021-27292](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27292)
![](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

ua-parser-js >= 0.7.14, fixed in 0.7.24, uses a regular expression which is vulnerable to denial of service. If an attacker sends a malicious User-Agent header, ua-parser-js will get stuck processing it for an extended period of time.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/doyensec/regexploit
- https://github.com/engn33r/awesome-redos-security
- https://github.com/retr0-13/regexploit