{"id":"UBUNTU-CVE-2021-20208","details":"A flaw was found in cifs-utils in versions before 6.13. A user when mounting a krb5 CIFS file system from within a container can use Kerberos credentials of the host. The highest threat from this vulnerability is to data confidentiality and integrity.","modified":"2026-01-30T02:10:22.513609Z","published":"2021-04-19T22:15:00Z","related":["USN-5459-1","USN-7688-1"],"upstream":["CVE-2021-20208"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-20208"},{"type":"REPORT","url":"https://lists.samba.org/archive/samba-technical/2021-April/136467.html"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5459-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-20208"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-7688-1"}],"affected":[{"package":{"name":"cifs-utils","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/cifs-utils@2:6.0-1ubuntu2+esm1?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:6.0-1ubuntu2+esm1"}]}],"versions":["2:6.0-1ubuntu2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_version":"2:6.0-1ubuntu2+esm1","binary_name":"cifs-utils"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20208.json"}},{"package":{"name":"cifs-utils","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/cifs-utils@2:6.4-1ubuntu1.1+esm1?arch=source&distro=esm-infra/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:6.4-1ubuntu1.1+esm1"}]}],"versions":["2:6.4-1ubuntu1","2:6.4-1ubuntu1.1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"cifs-utils","binary_version":"2:6.4-1ubuntu1.1+esm1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20208.json"}},{"package":{"name":"cifs-utils","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/cifs-utils@2:6.8-1ubuntu1.2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:6.8-1ubuntu1.2"}]}],"versions":["2:6.7-1","2:6.8-1","2:6.8-1ubuntu1","2:6.8-1ubuntu1.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"cifs-utils","binary_version":"2:6.8-1ubuntu1.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20208.json"}},{"package":{"name":"cifs-utils","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/cifs-utils@2:6.9-1ubuntu0.2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:6.9-1ubuntu0.2"}]}],"versions":["2:6.9-0ubuntu1","2:6.9-1","2:6.9-1ubuntu0.1"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"cifs-utils","binary_version":"2:6.9-1ubuntu0.2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-20208.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:L/I:H/A:N"},{"type":"Ubuntu","score":"low"}]}