cve/2020/CVE-2020-27223.md

### [CVE-2020-27223](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-27223)
![](https://img.shields.io/static/v1?label=Product&message=Eclipse%20Jetty&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3E%3D%209.4.6.v20170531%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-407%3A%20Inefficient%20Algorithmic%20Complexity&color=brighgreen)

### Description

In Eclipse Jetty 9.4.6.v20170531 to 9.4.36.v20210114 (inclusive), 10.0.0, and 11.0.0 when Jetty handles a request containing multiple Accept headers with a large number of “quality” (i.e. q) parameters, the server may enter a denial of service (DoS) state due to high CPU usage processing those quality values, resulting in minutes of CPU time exhausted processing those quality values.

### POC

#### Reference
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.oracle.com/security-alerts/cpuApr2021.html

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/EdgeSecurityTeam/Vulnerability
- https://github.com/Live-Hack-CVE/CVE-2020-2722
- https://github.com/SexyBeast233/SecBooks
- https://github.com/hshivhare67/Jetty_v9.4.31_CVE-2020-27223
- https://github.com/hshivhare67/Jetty_v9.4.31_CVE-2020-27223_beforepatch
- https://github.com/motikan2010/CVE-2020-27223
- https://github.com/nomi-sec/PoC-in-GitHub
- https://github.com/ttestoo/Jetty-CVE-2020-27223
- https://github.com/tzwlhack/Vulnerability