cve/2021/CVE-2021-42697.md

### [CVE-2021-42697](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-42697)
![](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

Akka HTTP 10.1.x before 10.1.15 and 10.2.x before 10.2.7 can encounter stack exhaustion while parsing HTTP headers, which allows a remote attacker to conduct a Denial of Service attack by sending a User-Agent header with deeply nested comments.

### POC

#### Reference
- http://packetstormsecurity.com/files/167018/Akka-HTTP-10.1.14-Denial-Of-Service.html

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/NaInSec/CVE-PoC-in-GitHub
- https://github.com/SYRTI/POC_to_review
- https://github.com/WhooAmii/POC_to_review
- https://github.com/cxosmo/CVE-2021-42697
- https://github.com/nomi-sec/PoC-in-GitHub
- https://github.com/trhacknon/Pocingit
- https://github.com/zecool/cve