CVEs-PoC/2021/CVE-2021-23953.md

### [CVE-2021-23953](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-23953)
![](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%2078.7%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2085%20&color=brightgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Cross-origin%20information%20leakage%20via%20redirected%20PDF%20requests&color=brightgreen)

### Description

If a user clicked into a specifically crafted PDF, the PDF reader could be confused into leaking cross-origin information, when said information is served as chunked data. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1683940

#### Github
- https://github.com/0xCyberY/CVE-T4PDF
- https://github.com/ARPSyndicate/cvemon