CVEs-PoC/2020/CVE-2020-12405.md

### [CVE-2020-12405](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12405)
![](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%2068.9%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2068.9.0%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2077%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Use-after-free%20in%20SharedWorkerService&color=brighgreen)

### Description

When browsing a malicious page, a race condition in our SharedWorkerService could occur and lead to a potentially exploitable crash. This vulnerability affects Thunderbird < 68.9.0, Firefox < 77, and Firefox ESR < 68.9.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1631618

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