### [CVE-2019-11745](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2019-11745)
![](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=n%2Fa&color=blue)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Out%20of%20bounds%20write%20in%20NSS%20when%20encrypting%20with%20a%20block%20cipher&color=brighgreen)

### Description

When encrypting with a block cipher, if a call to NSC_EncryptUpdate was made with data smaller than the block size, a small out of bounds write could occur. This could have caused heap corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 68.3, Firefox ESR < 68.3, and Firefox < 71.

### POC

#### Reference
- https://www.mozilla.org/security/advisories/mfsa2019-38/

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