### [CVE-2017-7763](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7763)
![](https://img.shields.io/static/v1?label=Product&message=Firefox%20ESR&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Product&message=Thunderbird&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=unspecified%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Mac%20fonts%20render%20some%20unicode%20characters%20as%20spaces&color=brightgreen)

### Description

Default fonts on OS X display some Tibetan characters as whitespace. When used in the addressbar as part of an IDN this can be used for domain name spoofing attacks. Note: This attack only affects OS X operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

### POC

#### Reference
- https://www.mozilla.org/security/advisories/mfsa2017-15/

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