cve/2021/CVE-2021-23997.md

### [CVE-2021-23997](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23997)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2088%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Use-after-free%20when%20freeing%20fonts%20from%20cache&color=brighgreen)

### Description

Due to unexpected data type conversions, a use-after-free could have occurred when interacting with the font cache. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox < 88.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1701942

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