{"id":"UBUNTU-CVE-2016-6210","details":"sshd in OpenSSH before 7.3, when SHA256 or SHA512 are used for user password hashing, uses BLOWFISH hashing on a static password when the username does not exist, which allows remote attackers to enumerate users by leveraging the timing difference between responses when a large password is provided.","modified":"2026-01-30T02:06:16.499362Z","published":"2016-07-18T00:00:00Z","related":["USN-3061-1"],"upstream":["CVE-2016-6210"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2016-6210"},{"type":"REPORT","url":"http://seclists.org/fulldisclosure/2016/Jul/51"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3061-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2016-6210"}],"affected":[{"package":{"name":"openssh","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:6.6p1-2ubuntu2.8?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:6.6p1-2ubuntu2.8"}]}],"versions":["1:6.2p2-6","1:6.2p2-6ubuntu1","1:6.4p1-1","1:6.4p1-2","1:6.5p1-1","1:6.5p1-2","1:6.5p1-3","1:6.5p1-4","1:6.5p1-6","1:6.6p1-1","1:6.6p1-2","1:6.6p1-2ubuntu1","1:6.6p1-2ubuntu2","1:6.6p1-2ubuntu2.2","1:6.6p1-2ubuntu2.3","1:6.6p1-2ubuntu2.4","1:6.6p1-2ubuntu2.6","1:6.6p1-2ubuntu2.7"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client","binary_version":"1:6.6p1-2ubuntu2.8"},{"binary_name":"openssh-server","binary_version":"1:6.6p1-2ubuntu2.8"},{"binary_name":"openssh-sftp-server","binary_version":"1:6.6p1-2ubuntu2.8"},{"binary_name":"ssh","binary_version":"1:6.6p1-2ubuntu2.8"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:6.6p1-2ubuntu2.8"},{"binary_name":"ssh-krb5","binary_version":"1:6.6p1-2ubuntu2.8"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-6210.json"}},{"package":{"name":"openssh","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/openssh@1:7.2p2-4ubuntu2.1?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:7.2p2-4ubuntu2.1"}]}],"versions":["1:6.9p1-2","1:6.9p1-3","1:7.1p1-1","1:7.1p1-3","1:7.1p1-4","1:7.1p1-6","1:7.1p2-1","1:7.1p2-2","1:7.2p1-1","1:7.2p2-1","1:7.2p2-2","1:7.2p2-3","1:7.2p2-4","1:7.2p2-4ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"openssh-client","binary_version":"1:7.2p2-4ubuntu2.1"},{"binary_name":"openssh-client-ssh1","binary_version":"1:7.2p2-4ubuntu2.1"},{"binary_name":"openssh-server","binary_version":"1:7.2p2-4ubuntu2.1"},{"binary_name":"openssh-sftp-server","binary_version":"1:7.2p2-4ubuntu2.1"},{"binary_name":"ssh","binary_version":"1:7.2p2-4ubuntu2.1"},{"binary_name":"ssh-askpass-gnome","binary_version":"1:7.2p2-4ubuntu2.1"},{"binary_name":"ssh-krb5","binary_version":"1:7.2p2-4ubuntu2.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2016/UBUNTU-CVE-2016-6210.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N"},{"type":"Ubuntu","score":"low"}]}