CVEs-PoC/2021/CVE-2021-1590.md

### [CVE-2021-1590](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-1590)
![](https://img.shields.io/static/v1?label=Product&message=Cisco%20NX-OS%20Software%20&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-787&color=brighgreen)

### Description

A vulnerability in the implementation of the system login block-for command for Cisco NX-OS Software could allow an unauthenticated, remote attacker to cause a login process to unexpectedly restart, causing a denial of service (DoS) condition. This vulnerability is due to a logic error in the implementation of the system login block-for command when an attack is detected and acted upon. An attacker could exploit this vulnerability by performing a brute-force login attack on an affected device. A successful exploit could allow the attacker to cause a login process to reload, which could result in a delay during authentication to the affected device.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/p1ay8y3ar/cve_monitor