CVE-2017-7825: Debian Linux

Medium severity, CVSS 5.3. EPSS: 1.6% chance of exploitation in the next 30 days.

Several fonts on OS X display some Tibetan and Arabic characters as whitespace. When used in the addressbar as part of an IDN this can be used for domain name spoofing attacks. Note: This attack only affects OS X operating systems. Other operating systems are unaffected. This vulnerability affects Firefox < 56, Firefox ESR < 52.4, and Thunderbird < 52.4.

Affected products

• Debian Debian Linux: version 7.0 only
• Mozilla Firefox: before 52.4.0 (fixed in 52.4.0); before 56.0 (fixed in 56.0)
• Mozilla Thunderbird: before 52.4.0 (fixed in 52.4.0)

Published 2018-06-11. Last modified 2026-06-17.