### [CVE-2016-7431](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-7431)
![](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 4.2.8p9 allows remote attackers to bypass the origin timestamp protection mechanism via an origin timestamp of zero.  NOTE: this vulnerability exists because of a CVE-2015-8138 regression.

### POC

#### Reference
- http://packetstormsecurity.com/files/140240/FreeBSD-Security-Advisory-FreeBSD-SA-16.39.ntp.html
- http://www.oracle.com/technetwork/security-advisory/cpuoct2017-3236626.html
- http://www.ubuntu.com/usn/USN-3349-1
- https://www.kb.cert.org/vuls/id/633847

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