### [CVE-2017-7758](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7758)
![](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%2052.2%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2054%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Out-of-bounds%20read%20in%20Opus%20encoder&color=brighgreen)

### Description

An out-of-bounds read vulnerability with the Opus encoder when the number of channels in an audio stream changes while the encoder is in use. This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1368490

#### Github
No PoCs found on GitHub currently.