### [CVE-2017-7800](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7800)
![](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=%3C%2052.3%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2055%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Use-after-free%20in%20WebSockets%20during%20disconnection&color=brighgreen)

### Description

A use-after-free vulnerability can occur in WebSockets when the object holding the connection is freed before the disconnection operation is finished. This results in an exploitable crash. This vulnerability affects Thunderbird < 52.3, Firefox ESR < 52.3, and Firefox < 55.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1374047

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