{"id":"DEBIAN-CVE-2016-20012","details":"OpenSSH through 8.7 allows remote attackers, who have a suspicion that a certain combination of username and public key is known to an SSH server, to test whether this suspicion is correct. This occurs because a challenge is sent only when that combination could be valid for a login session. NOTE: the vendor does not recognize user enumeration as a vulnerability for this product","modified":"2026-09-22T07:01:26.763678346Z","published":"2021-09-15T20:15:07.310Z","upstream":["CVE-2016-20012"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2016-20012"}],"affected":[{"package":{"name":"openssh","ecosystem":"Debian:12","purl":"pkg:deb/debian/openssh?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:10.0p1-1","1:10.0p1-2","1:10.0p1-3","1:10.0p1-4","1:10.0p1-5","1:10.0p1-5~bpo12+2","1:10.0p1-6","1:10.0p1-7","1:10.0p1-7~bpo12+1","1:10.0p1-8","1:10.1p1-1","1:10.1p1-2","1:10.2p1-1","1:10.2p1-2","1:10.2p1-2~bpo13+1","1:10.2p1-3","1:10.2p1-4","1:10.2p1-5","1:10.2p1-6","1:10.2p1-6~bpo13+1","1:10.3p1-1","1:10.3p1-1~bpo13+1","1:10.3p1-2","1:10.3p1-3","1:10.3p1-4","1:10.3p1-5","1:10.3p1-7","1:10.3p1-8","1:10.3p1-9","1:10.4p1-1","1:10.4p1-2","1:10.4p1-3","1:10.4p1-4","1:10.4p1-5","1:10.5p1-1","1:9.2p1-2","1:9.2p1-2+deb12u1","1:9.2p1-2+deb12u10","1:9.2p1-2+deb12u2","1:9.2p1-2+deb12u3","1:9.2p1-2+deb12u4","1:9.2p1-2+deb12u5","1:9.2p1-2+deb12u6","1:9.2p1-2+deb12u7","1:9.2p1-2+deb12u8","1:9.2p1-2+deb12u9","1:9.3p1-1","1:9.3p1-1+loong64","1:9.3p2-1","1:9.4p1-1","1:9.5p1-1","1:9.5p1-2","1:9.6p1-1","1:9.6p1-2","1:9.6p1-3","1:9.6p1-4","1:9.6p1-5","1:9.7p1-1","1:9.7p1-2","1:9.7p1-3","1:9.7p1-3+hurd.1","1:9.7p1-4","1:9.7p1-5","1:9.7p1-6","1:9.7p1-7","1:9.8p1-1","1:9.8p1-2","1:9.8p1-3","1:9.8p1-4","1:9.8p1-7","1:9.8p1-8","1:9.9p1-1","1:9.9p1-2","1:9.9p1-3","1:9.9p1-3+hurd.1","1:9.9p2-1","1:9.9p2-2"],"ecosystem_specific":{"urgency":"unimportant"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2016-20012.json"}},{"package":{"name":"openssh","ecosystem":"Debian:13","purl":"pkg:deb/debian/openssh?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:10.0p1-7","1:10.0p1-7+deb13u1","1:10.0p1-7+deb13u2","1:10.0p1-7+deb13u3","1:10.0p1-7+deb13u4","1:10.0p1-8","1:10.1p1-1","1:10.1p1-2","1:10.2p1-1","1:10.2p1-2","1:10.2p1-2~bpo13+1","1:10.2p1-3","1:10.2p1-4","1:10.2p1-5","1:10.2p1-6","1:10.2p1-6~bpo13+1","1:10.3p1-1","1:10.3p1-1~bpo13+1","1:10.3p1-2","1:10.3p1-3","1:10.3p1-4","1:10.3p1-5","1:10.3p1-7","1:10.3p1-8","1:10.3p1-9","1:10.4p1-1","1:10.4p1-2","1:10.4p1-3","1:10.4p1-4","1:10.4p1-5","1:10.5p1-1"],"ecosystem_specific":{"urgency":"unimportant"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2016-20012.json"}},{"package":{"name":"openssh","ecosystem":"Debian:14","purl":"pkg:deb/debian/openssh?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1:10.0p1-7","1:10.0p1-8","1:10.1p1-1","1:10.1p1-2","1:10.2p1-1","1:10.2p1-2","1:10.2p1-2~bpo13+1","1:10.2p1-3","1:10.2p1-4","1:10.2p1-5","1:10.2p1-6","1:10.2p1-6~bpo13+1","1:10.3p1-1","1:10.3p1-1~bpo13+1","1:10.3p1-2","1:10.3p1-3","1:10.3p1-4","1:10.3p1-5","1:10.3p1-7","1:10.3p1-8","1:10.3p1-9","1:10.4p1-1","1:10.4p1-2","1:10.4p1-3","1:10.4p1-4","1:10.4p1-5","1:10.5p1-1"],"ecosystem_specific":{"urgency":"unimportant"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2016-20012.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N"}]}