cve/2019/CVE-2019-9516.md

### [CVE-2019-9516](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-9516)
![](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=CWE-400%20Uncontrolled%20Resource%20Consumption&color=brighgreen)

### Description

Some HTTP/2 implementations are vulnerable to a header leak, potentially leading to a denial of service. The attacker sends a stream of headers with a 0-length header name and 0-length header value, optionally Huffman encoded into 1-byte or greater headers. Some implementations allocate memory for these headers and keep the allocation alive until the session dies. This can consume excess memory.

### POC

#### Reference
- https://kb.cert.org/vuls/id/605641/

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/flyniu666/ingress-nginx-0.21-1.19.5
- https://github.com/rmtec/modeswitcher
- https://github.com/vshaliii/DC-4-Vulnhub-Walkthrough