{"id":"USN-4454-1","summary":"samba vulnerability","details":"Martin von Wittich and Wilko Meyer discovered that Samba incorrectly\nhandled certain empty UDP packets when being used as a AD DC NBT server. A\nremote attacker could possibly use this issue to cause Samba to crash,\nresulting in a denial of service.\n","modified":"2026-04-22T10:16:02.046894Z","published":"2020-08-10T13:42:33Z","related":["UBUNTU-CVE-2020-14303"],"upstream":["CVE-2020-14303","UBUNTU-CVE-2020-14303"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4454-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-14303"}],"affected":[{"package":{"name":"samba","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/samba@2:4.3.11+dfsg-0ubuntu0.16.04.29?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:4.3.11+dfsg-0ubuntu0.16.04.29"}]}],"versions":["2:4.1.17+dfsg-4ubuntu2","2:4.1.20+dfsg-1ubuntu1","2:4.1.20+dfsg-1ubuntu2","2:4.1.20+dfsg-1ubuntu3","2:4.1.20+dfsg-1ubuntu5","2:4.3.3+dfsg-1ubuntu1","2:4.3.3+dfsg-1ubuntu2","2:4.3.3+dfsg-1ubuntu3","2:4.3.6+dfsg-1ubuntu1","2:4.3.8+dfsg-0ubuntu1","2:4.3.9+dfsg-0ubuntu0.16.04.1","2:4.3.9+dfsg-0ubuntu0.16.04.2","2:4.3.9+dfsg-0ubuntu0.16.04.3","2:4.3.11+dfsg-0ubuntu0.16.04.1","2:4.3.11+dfsg-0ubuntu0.16.04.3","2:4.3.11+dfsg-0ubuntu0.16.04.5","2:4.3.11+dfsg-0ubuntu0.16.04.6","2:4.3.11+dfsg-0ubuntu0.16.04.7","2:4.3.11+dfsg-0ubuntu0.16.04.8","2:4.3.11+dfsg-0ubuntu0.16.04.9","2:4.3.11+dfsg-0ubuntu0.16.04.10","2:4.3.11+dfsg-0ubuntu0.16.04.11","2:4.3.11+dfsg-0ubuntu0.16.04.12","2:4.3.11+dfsg-0ubuntu0.16.04.13","2:4.3.11+dfsg-0ubuntu0.16.04.15","2:4.3.11+dfsg-0ubuntu0.16.04.16","2:4.3.11+dfsg-0ubuntu0.16.04.17","2:4.3.11+dfsg-0ubuntu0.16.04.18","2:4.3.11+dfsg-0ubuntu0.16.04.19","2:4.3.11+dfsg-0ubuntu0.16.04.20","2:4.3.11+dfsg-0ubuntu0.16.04.21","2:4.3.11+dfsg-0ubuntu0.16.04.23","2:4.3.11+dfsg-0ubuntu0.16.04.24","2:4.3.11+dfsg-0ubuntu0.16.04.25","2:4.3.11+dfsg-0ubuntu0.16.04.26","2:4.3.11+dfsg-0ubuntu0.16.04.27","2:4.3.11+dfsg-0ubuntu0.16.04.28"],"ecosystem_specific":{"binaries":[{"binary_name":"ctdb","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"libnss-winbind","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"libpam-winbind","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"libparse-pidl-perl","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"libsmbclient","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"libwbclient0","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"python-samba","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"registry-tools","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"samba","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"samba-common","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"samba-common-bin","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"samba-dsdb-modules","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"samba-libs","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"samba-testsuite","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"samba-vfs-modules","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"smbclient","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"},{"binary_name":"winbind","binary_version":"2:4.3.11+dfsg-0ubuntu0.16.04.29"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4454-1.json","cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2020-14303"}],"ecosystem":"Ubuntu:16.04:LTS"}}},{"package":{"name":"samba","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/samba@2:4.7.6+dfsg~ubuntu-0ubuntu2.18?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"}]}],"versions":["2:4.6.7+dfsg-1ubuntu3","2:4.7.1+dfsg-1ubuntu1","2:4.7.3+dfsg-1ubuntu1","2:4.7.4+dfsg-1ubuntu1","2:4.7.6+dfsg~ubuntu-0ubuntu1","2:4.7.6+dfsg~ubuntu-0ubuntu2","2:4.7.6+dfsg~ubuntu-0ubuntu2.2","2:4.7.6+dfsg~ubuntu-0ubuntu2.4","2:4.7.6+dfsg~ubuntu-0ubuntu2.5","2:4.7.6+dfsg~ubuntu-0ubuntu2.6","2:4.7.6+dfsg~ubuntu-0ubuntu2.7","2:4.7.6+dfsg~ubuntu-0ubuntu2.9","2:4.7.6+dfsg~ubuntu-0ubuntu2.10","2:4.7.6+dfsg~ubuntu-0ubuntu2.11","2:4.7.6+dfsg~ubuntu-0ubuntu2.13","2:4.7.6+dfsg~ubuntu-0ubuntu2.14","2:4.7.6+dfsg~ubuntu-0ubuntu2.15","2:4.7.6+dfsg~ubuntu-0ubuntu2.16","2:4.7.6+dfsg~ubuntu-0ubuntu2.17"],"ecosystem_specific":{"binaries":[{"binary_name":"ctdb","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"libnss-winbind","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"libpam-winbind","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"libparse-pidl-perl","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"libsmbclient","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"libwbclient0","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"python-samba","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"registry-tools","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"samba","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"samba-common","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"samba-common-bin","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"samba-dsdb-modules","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"samba-libs","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"samba-testsuite","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"samba-vfs-modules","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"smbclient","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"},{"binary_name":"winbind","binary_version":"2:4.7.6+dfsg~ubuntu-0ubuntu2.18"}],"availability":"No 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