### [CVE-2021-38498](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-38498)
![](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%2091.2%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2093%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Use-after-free%20of%20nsLanguageAtomService%20object&color=brighgreen)

### Description

During process shutdown, a document could have caused a use-after-free of a languages service object, leading to memory corruption and a potentially exploitable crash. This vulnerability affects Firefox < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1729642

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