cve/2019/CVE-2019-10072.md

### [CVE-2019-10072](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-10072)
![](https://img.shields.io/static/v1?label=Product&message=Apache%20Tomcat&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Denial%20of%20Service&color=brighgreen)

### Description

The fix for CVE-2019-0199 was incomplete and did not address HTTP/2 connection window exhaustion on write in Apache Tomcat versions 9.0.0.M1 to 9.0.19 and 8.5.0 to 8.5.40 . By not sending WINDOW_UPDATE messages for the connection window (stream 0) clients were able to cause server-side threads to block eventually leading to thread exhaustion and a DoS.

### POC

#### Reference
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.oracle.com/security-alerts/cpuapr2020.html
- https://www.oracle.com/security-alerts/cpujan2020.html
- https://www.oracle.com/security-alerts/cpuoct2020.html
- https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/ilmari666/cybsec
- https://github.com/vshaliii/Basic-Pentesting-2-Vulnhub-Walkthrough