CVE-2013-1699: Mozilla Firefox

Medium severity, CVSS 5.0. EPSS: 2.1% chance of exploitation in the next 30 days.

The Internationalized Domain Name (IDN) display algorithm in Mozilla Firefox before 22.0 does not properly handle the .com, .name, and .net top-level domains, which allows remote attackers to spoof the address bar via unspecified homograph characters.

Affected products

• Mozilla Firefox: up to and including 21.0; version 19.0 only; version 19.0.1 only; version 19.0.2 only; version 20.0 only; version 20.0.1 only

Published 2013-06-26. Last modified 2026-06-16.