### [CVE-2017-5402](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-5402)
![](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=Use-after-free%20working%20with%20events%20in%20FontFace%20objects&color=brightgreen)

### Description

A use-after-free can occur when events are fired for a "FontFace" object after the object has been already been destroyed while working with fonts. This results in a potentially exploitable crash. This vulnerability affects Firefox < 52, Firefox ESR < 45.8, Thunderbird < 52, and Thunderbird < 45.8.

### POC

#### Reference
- https://www.mozilla.org/security/advisories/mfsa2017-05/

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