cve/2023/CVE-2023-6863.md

### [CVE-2023-6863](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6863)
![](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%20115.6%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=unspecified%3C%20121%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Undefined%20behavior%20in%20ShutdownObserver()&color=brighgreen)

### Description

The `ShutdownObserver()` was susceptible to potentially undefined behavior due to its reliance on a dynamic type that lacked a virtual destructor. This vulnerability affects Firefox ESR < 115.6, Thunderbird < 115.6, and Firefox < 121.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/fkie-cad/nvd-json-data-feeds