CVE-2009-2818: Apple Mac OS X Server

Medium severity, CVSS 5.0. EPSS: 1.9% chance of exploitation in the next 30 days.

Adaptive Firewall in Apple Mac OS X before 10.6.2 does not properly handle invalid usernames in SSH login attempts, which makes it easier for remote attackers to obtain login access via a brute-force attack (aka dictionary attack).

Affected products

• Apple Mac OS X Server: up to and including 10.6.1; version 10.0 only; version 10.0.0 only; version 10.0.1 only; version 10.0.2 only; version 10.0.3 only; …

Published 2009-11-10. Last modified 2026-06-16.