{"id":"USN-4656-1","summary":"xorg-server, xorg-server-hwe-16.04, xorg-server-hwe-18.04 vulnerabilities","details":"Jan-Niklas Sohn discovered that the X.Org X Server XKB extension\nincorrectly handled certain inputs. A local attacker could possibly use\nthis issue to escalate privileges.\n","modified":"2026-02-10T04:41:59Z","published":"2020-12-01T16:08:56Z","related":["UBUNTU-CVE-2020-14360","UBUNTU-CVE-2020-25712"],"upstream":["CVE-2020-14360","CVE-2020-25712","UBUNTU-CVE-2020-14360","UBUNTU-CVE-2020-25712"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4656-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-14360"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-25712"}],"affected":[{"package":{"name":"xorg-server","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/xorg-server@2:1.18.4-0ubuntu0.11?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.18.4-0ubuntu0.11"}]}],"versions":["2:1.17.2-1ubuntu9","2:1.17.2-1ubuntu10","2:1.17.3-2ubuntu1","2:1.17.3-2ubuntu2","2:1.17.3-2ubuntu3","2:1.17.3-2ubuntu4","2:1.18.1-1ubuntu3","2:1.18.1-1ubuntu4","2:1.18.3-1ubuntu1","2:1.18.3-1ubuntu2","2:1.18.3-1ubuntu2.2","2:1.18.3-1ubuntu2.3","2:1.18.4-0ubuntu0.1","2:1.18.4-0ubuntu0.2","2:1.18.4-0ubuntu0.3","2:1.18.4-0ubuntu0.4","2:1.18.4-0ubuntu0.6","2:1.18.4-0ubuntu0.7","2:1.18.4-0ubuntu0.8","2:1.18.4-0ubuntu0.9","2:1.18.4-0ubuntu0.10"],"ecosystem_specific":{"binaries":[{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xdmx"},{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xdmx-tools"},{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xmir"},{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xnest"},{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xorg-server-source"},{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xserver-common"},{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xserver-xephyr"},{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xserver-xorg-core"},{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xserver-xorg-dev"},{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xserver-xorg-legacy"},{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xserver-xorg-xmir"},{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xvfb"},{"binary_version":"2:1.18.4-0ubuntu0.11","binary_name":"xwayland"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4656-1.json","cves_map":{"cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2020-14360"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2020-25712"}],"ecosystem":"Ubuntu:16.04:LTS"}}},{"package":{"name":"xorg-server-hwe-16.04","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/xorg-server-hwe-16.04@2:1.19.6-1ubuntu4.1~16.04.5?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2:1.19.6-1ubuntu4.1~16.04.5"}]}],"versions":["2:1.18.4-1ubuntu6.1~16.04.1","2:1.18.4-1ubuntu6.1~16.04.2","2:1.19.3-1ubuntu1~16.04.2","2:1.19.3-1ubuntu1~16.04.3","2:1.19.3-1ubuntu1~16.04.4","2:1.19.5-0ubuntu2~16.04.1","2:1.19.6-1ubuntu4~16.04.1","2:1.19.6-1ubuntu4.1~16.04.1","2:1.19.6-1ubuntu4.1~16.04.2","2:1.19.6-1ubuntu4.1~16.04.3","2:1.19.6-1ubuntu4.1~16.04.4"],"ecosystem_specific":{"binaries":[{"binary_version":"2:1.19.6-1ubuntu4.1~16.04.5","binary_name":"xmir-hwe-16.04"},{"binary_version":"2:1.19.6-1ubuntu4.1~16.04.5","binary_name":"xorg-server-source-hwe-16.04"},{"binary_version":"2:1.19.6-1ubuntu4.1~16.04.5","binary_name":"xserver-xephyr-hwe-16.04"},{"binary_version":"2:1.19.6-1ubuntu4.1~16.04.5","binary_name":"xserver-xorg-core-hwe-16.04"},{"binary_version":"2:1.19.6-1ubuntu4.1~16.04.5","binary_name":"xserver-xorg-dev-hwe-16.04"},{"binary_version":"2:1.19.6-1ubuntu4.1~16.04.5","binary_name":"xserver-xorg-legacy-hwe-16.04"},{"binary_version":"2:1.19.6-1ubuntu4.1~16.04.5","binary_name":"xwayland-hwe-16.04"}],"availability":"No 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