### [CVE-2009-3563](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2009-3563)
![](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

ntp_request.c in ntpd in NTP before 4.2.4p8, and 4.2.5, allows remote attackers to cause a denial of service (CPU and bandwidth consumption) by using MODE_PRIVATE to send a spoofed (1) request or (2) response packet that triggers a continuous exchange of MODE_PRIVATE error responses between two NTP daemons.

### POC

#### Reference
- https://www.kb.cert.org/vuls/id/417980
- https://www.kb.cert.org/vuls/id/417980

#### Github
- https://github.com/NaInSec/CVE-LIST