How severe is CVE-2017-7764?

This vulnerability has a severity rating of MEDIUM with a CVSS score of 5.3 out of 10.

What type of vulnerability is CVE-2017-7764?

This is classified as CWE-20, which is a common weakness in software security.

CVE-2017-7764 - MEDIUM Severity | CVSS 5.3

Vulnerability Description

Characters from the "Canadian Syllabics" unicode block can be mixed with characters from other unicode blocks in the addressbar instead of being rendered as their raw "punycode" form, allowing for domain name spoofing attacks through character confusion. The current Unicode standard allows characters from "Aspirational Use Scripts" such as Canadian Syllabics to be mixed with Latin characters in the "moderately restrictive" IDN profile. We have changed Firefox behavior to match the upcoming Unicode version 10.0 which removes this category and treats them as "Limited Use Scripts.". This vulnerability affects Firefox < 54, Firefox ESR < 52.2, and Thunderbird < 52.2.

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