cve/2023/CVE-2023-6857.md

### [CVE-2023-6857](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-6857)
![](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=Symlinks%20may%20resolve%20to%20smaller%20than%20expected%20buffers&color=brighgreen)

### Description

When resolving a symlink, a race may occur where the buffer passed to `readlink` may actually be smaller than necessary. *This bug only affects Firefox on Unix-based operating systems (Android, Linux, MacOS). Windows is unaffected.* 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