### [CVE-2017-7838](https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2017-7838)
![](https://img.shields.io/static/v1?label=Product&message=Firefox&color=blue)
![](https://img.shields.io/static/v1?label=Version&message=%3C%2057%20&color=brighgreen)
![](https://img.shields.io/static/v1?label=Vulnerability&message=Failure%20of%20individual%20decoding%20of%20labels%20in%20international%20domain%20names%20triggers%20punycode%20display%20of%20entire%20IDN&color=brighgreen)

### Description

Punycode format text will be displayed for entire qualified international domain names in some instances when a sub-domain triggers the punycode display instead of the primary domain being displayed in native script and the sub-domain only displaying as punycode. This could be used for limited spoofing attacks due to user confusion. This vulnerability affects Firefox < 57.

### POC

#### Reference
- https://bugzilla.mozilla.org/show_bug.cgi?id=1399540

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