CVE-2006-4403: Apple Mac OS X

Medium severity, CVSS 4.0. EPSS: 3.6% chance of exploitation in the next 30 days.

The FTP server in Apple Mac OS X 10.4.8 and earlier, when FTP Access is enabled, will crash when a login failure occurs with a valid user name, which allows remote attackers to cause a denial of service (crash) and enumerate valid usernames.

Affected products

• Apple Mac OS X: up to and including 10.4.8

Published 2006-11-30. Last modified 2026-06-16.