cve/2023/CVE-2023-5171.md

### [CVE-2023-5171](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-5171)
![](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=unspecified%3C%20115.3%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=unspecified%3C%20118%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Use-after-free%20in%20Ion%20Compiler&color=brighgreen)

### Description

During Ion compilation, a Garbage Collection could have resulted in a use-after-free condition, allowing an attacker to write two NUL bytes, and cause a potentially exploitable crash. This vulnerability affects Firefox < 118, Firefox ESR < 115.3, and Thunderbird < 115.3.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/googleprojectzero/fuzzilli
- https://github.com/zhangjiahui-buaa/MasterThesis