{"id":"UBUNTU-CVE-2013-4434","details":"Dropbear SSH Server before 2013.59 generates error messages for a failed logon attempt with different time delays depending on whether the user account exists, which allows remote attackers to discover valid usernames.","modified":"2025-07-16T08:10:46.398097Z","published":"2013-10-25T23:55:00Z","withdrawn":"2025-07-18T16:42:55Z","upstream":["CVE-2013-4434"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2013-4434"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2013-4434"}],"affected":[{"package":{"name":"dropbear","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/dropbear@2013.60-1ubuntu2?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2013.60-1ubuntu2"}]}],"versions":["2012.55-1.3ubuntu1","2012.55-1.4ubuntu1","2013.60-1ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"dropbear","binary_version":"2013.60-1ubuntu2"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2013/UBUNTU-CVE-2013-4434.json"}}],"schema_version":"1.7.3","severity":[{"type":"Ubuntu","score":"medium"}]}