The combined, single character, version of the letter 'i' with any of the potential accents in unicode, such as acute or grave, can be spoofed in the addressbar by the dotless version of 'i' followed by the same accent as a second character with most font sets. This allows for domain spoofing attacks because these combined domain names do not display as punycode. This vulnerability affects Firefox < 57.
CVSS Details
- CVSS 3.1 Base Score: 5.3
- CVSS 3.0 Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jun 11, 2018 |
| Freebsd | — | Upgrade palemoonUpgrade linux-thunderbirdUpgrade firefox-esrUpgrade linux-seamonkeyUpgrade linux-firefoxUpgrade thunderbirdUpgrade firefoxUpgrade seamonkeyUpgrade libxul | Nov 28, 2017 | Nov 28, 2017 |
| Mfsa2017 24 | — | Upgrade to Mozilla Firefox version 57.0Upgrade to the latest version of Mozilla Firefox | Nov 15, 2017 | Nov 14, 2017 |
| Suse | — | Upgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox | May 20, 2018 | Nov 14, 2017 |
| Ubuntu | — | Upgrade firefox | Nov 16, 2017 | Nov 14, 2017 |
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