### [CVE-2019-11727](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11727)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2068%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=PKCS%231%20v1.5%20signatures%20can%20be%20used%20for%20TLS%201.3&color=brighgreen)

### Description

A vulnerability exists where it possible to force Network Security Services (NSS) to sign CertificateVerify with PKCS#1 v1.5 signatures when those are the only ones advertised by server in CertificateRequest in TLS 1.3. PKCS#1 v1.5 signatures should not be used for TLS 1.3 messages. This vulnerability affects Firefox < 68.

### POC

#### Reference
No PoCs from references.

#### Github
- https://github.com/ARPSyndicate/cvemon