cve/2016/CVE-2016-4540.md

### [CVE-2016-4540](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2016-4540)
![](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

The grapheme_stripos function in ext/intl/grapheme/grapheme_string.c in PHP before 5.5.35, 5.6.x before 5.6.21, and 7.x before 7.0.6 allows remote attackers to cause a denial of service (out-of-bounds read) or possibly have unspecified other impact via a negative offset.

### POC

#### Reference
- https://h20566.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c05390722

#### Github
- https://github.com/bralbral/ipinfo.sh
- https://github.com/tchivert/ipinfo.sh