Openbsd : Security Vulnerabilities, CVEs, Published In 2007 (Gain Privilege) CVSS score >= 5

OpenSSH 4.6 and earlier, when ChallengeResponseAuthentication is enabled, allows remote attackers to determine the existence of user accounts by attempting to authenticate via S/KEY, which displays a different response if the user account exists, a similar issue to CVE-2001-1483.