cve/2020/CVE-2020-12403.md

### [CVE-2020-12403](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2020-12403)
![](https://img.shields.io/static/v1?label=Product&message=nss&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=CWE-125&color=brighgreen)

### Description

A flaw was found in the way CHACHA20-POLY1305 was implemented in NSS in versions before 3.55. When using multi-part Chacha20, it could cause out-of-bounds reads. This issue was fixed by explicitly disabling multi-part ChaCha20 (which was not functioning correctly) and strictly enforcing tag length. The highest threat from this vulnerability is to confidentiality and system availability.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/MrE-Fog/cryptofuzz
- https://github.com/guidovranken/cryptofuzz