### [CVE-2021-22883](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-22883)
![](https://img.shields.io/static/v1?label=Product&message=Node&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=10.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=11.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=12.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=13.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=14.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=15.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=4.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=5.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=6.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=7.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=8.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=9.0%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Denial%20of%20Service%20(CWE-400)&color=brightgreen)

### Description

Node.js before 10.24.0, 12.21.0, 14.16.0, and 15.10.0 is vulnerable to a denial of service attack when too many connection attempts with an 'unknownProtocol' are established. This leads to a leak of file descriptors. If a file descriptor limit is configured on the system, then the server is unable to accept new connections and prevent the process also from opening, e.g. a file. If no file descriptor limit is configured, then this lead to an excessive memory usage and cause the system to run out of memory.

### POC

#### Reference
- https://www.oracle.com//security-alerts/cpujul2021.html
- https://www.oracle.com/security-alerts/cpuApr2021.html
- https://www.oracle.com/security-alerts/cpuoct2021.html

#### Github
- https://github.com/n0-traces/cve_monitor