CVEs-PoC/2020/CVE-2020-6819.md

### [CVE-2020-6819](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-6819)
![](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%2068.6.1%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2068.7.0%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2074.0.1%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Use-after-free%20while%20running%20the%20nsDocShell%20destructor&color=brighgreen)

### Description

Under certain conditions, when running the nsDocShell destructor, a race condition can cause a use-after-free. We are aware of targeted attacks in the wild abusing this flaw. This vulnerability affects Thunderbird < 68.7.0, Firefox < 74.0.1, and Firefox ESR < 68.6.1.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cvemon
- https://github.com/Ostorlab/KEV
- https://github.com/Ostorlab/known_exploited_vulnerbilities_detectors