### [CVE-2016-2517](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-2517)
![](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 before 4.2.8p7 and 4.3.x before 4.3.92 allows remote attackers to cause a denial of service (prevent subsequent authentication) by leveraging knowledge of the controlkey or requestkey and sending a crafted packet to ntpd, which changes the value of trustedkey, controlkey, or requestkey.  NOTE: this vulnerability exists because of a CVE-2016-2516 regression.

### POC

#### Reference
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- https://www.kb.cert.org/vuls/id/718152

#### Github
No PoCs found on GitHub currently.