{"id":"UBUNTU-CVE-2018-6307","details":"LibVNC before commit ca2a5ac02fbbadd0a21fabba779c1ea69173d10b contains heap use-after-free vulnerability in server code of file transfer extension that can result remote code execution.","modified":"2026-04-22T13:17:36.280014Z","published":"2018-12-19T00:00:00Z","related":["USN-3877-1"],"upstream":["CVE-2018-6307"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-6307"},{"type":"REPORT","url":"https://ics-cert.kaspersky.com/advisories/klcert-advisories/2018/12/19/klcert-18-026-libvnc-heap-use-after-free/"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-3877-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-6307"}],"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":{"binaries":[{"binary_version":"0.9.9+dfsg-1ubuntu1.4","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"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-6307.json"}},{"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_version":"0.9.10+dfsg-3ubuntu0.16.04.3","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"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-6307.json"}},{"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":{"binaries":[{"binary_version":"0.9.11+dfsg-1ubuntu1.1","binary_name":"libvncclient1"},{"binary_version":"0.9.11+dfsg-1ubuntu1.1","binary_name":"libvncserver-config"},{"binary_version":"0.9.11+dfsg-1ubuntu1.1","binary_name":"libvncserver1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-6307.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}