{"id":"USN-3877-1","summary":"libvncserver vulnerabilities","details":"It was discovered that LibVNCServer incorrectly handled certain operations.\nA remote attacker able to connect to applications using LibVNCServer could\npossibly use this issue to obtain sensitive information, cause a denial of\nservice, or execute arbitrary code.\n","modified":"2026-04-27T15:32:54.988534850Z","published":"2019-01-31T19:09:23Z","related":["UBUNTU-CVE-2018-15126","UBUNTU-CVE-2018-15127","UBUNTU-CVE-2018-20019","UBUNTU-CVE-2018-20020","UBUNTU-CVE-2018-20021","UBUNTU-CVE-2018-20022","UBUNTU-CVE-2018-20023","UBUNTU-CVE-2018-20024","UBUNTU-CVE-2018-20748","UBUNTU-CVE-2018-20749","UBUNTU-CVE-2018-20750","UBUNTU-CVE-2018-6307"],"upstream":["CVE-2018-15126","CVE-2018-15127","CVE-2018-20019","CVE-2018-20020","CVE-2018-20021","CVE-2018-20022","CVE-2018-20023","CVE-2018-20024","CVE-2018-20748","CVE-2018-20749","CVE-2018-20750","CVE-2018-6307","UBUNTU-CVE-2018-15126","UBUNTU-CVE-2018-15127","UBUNTU-CVE-2018-20019","UBUNTU-CVE-2018-20020","UBUNTU-CVE-2018-20021","UBUNTU-CVE-2018-20022","UBUNTU-CVE-2018-20023","UBUNTU-CVE-2018-20024","UBUNTU-CVE-2018-20748","UBUNTU-CVE-2018-20749","UBUNTU-CVE-2018-20750","UBUNTU-CVE-2018-6307"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3877-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-6307"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-15126"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-15127"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20019"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20020"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20021"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20022"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20023"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20024"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20748"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20749"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-20750"}],"affected":[{"package":{"name":"libvncserver","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/libvncserver@0.9.9+dfsg-1ubuntu1.4?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.9+dfsg-1ubuntu1.4"}]}],"versions":["0.9.9+dfsg-1","0.9.9+dfsg-1ubuntu1","0.9.9+dfsg-1ubuntu1.1","0.9.9+dfsg-1ubuntu1.2","0.9.9+dfsg-1ubuntu1.3"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"libvncserver-config","binary_version":"0.9.9+dfsg-1ubuntu1.4"},{"binary_name":"libvncserver0","binary_version":"0.9.9+dfsg-1ubuntu1.4"},{"binary_name":"linuxvnc","binary_version":"0.9.9+dfsg-1ubuntu1.4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-3877-1.json","cves_map":{"cves":[{"id":"CVE-2018-6307","severity":[{"score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2018-15126","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2018-15127"},{"id":"CVE-2018-20019","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2018-20020","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2018-20021","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2018-20022","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2018-20023"},{"id":"CVE-2018-20024","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2018-20748","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2018-20749","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2018-20750","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}],"ecosystem":"Ubuntu:14.04:LTS"}}},{"package":{"name":"libvncserver","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libvncserver@0.9.10+dfsg-3ubuntu0.16.04.3?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.10+dfsg-3ubuntu0.16.04.3"}]}],"versions":["0.9.10+dfsg-3","0.9.10+dfsg-3build1","0.9.10+dfsg-3ubuntu0.16.04.1","0.9.10+dfsg-3ubuntu0.16.04.2"],"ecosystem_specific":{"binaries":[{"binary_name":"libvncclient1","binary_version":"0.9.10+dfsg-3ubuntu0.16.04.3"},{"binary_name":"libvncserver-config","binary_version":"0.9.10+dfsg-3ubuntu0.16.04.3"},{"binary_name":"libvncserver1","binary_version":"0.9.10+dfsg-3ubuntu0.16.04.3"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-3877-1.json","cves_map":{"cves":[{"id":"CVE-2018-6307","severity":[{"score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2018-15126","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2018-15127","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2018-20019","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2018-20020","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2018-20021","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2018-20022","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2018-20023","severity":[{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2018-20024","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2018-20748","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2018-20749","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2018-20750"}],"ecosystem":"Ubuntu:16.04:LTS"}}},{"package":{"name":"libvncserver","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libvncserver@0.9.11+dfsg-1ubuntu1.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.9.11+dfsg-1ubuntu1.1"}]}],"versions":["0.9.11+dfsg-1","0.9.11+dfsg-1ubuntu1"],"ecosystem_specific":{"availability":"No 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