{"id":"UBUNTU-CVE-2018-21247","details":"An issue was discovered in LibVNCServer before 0.9.13. There is an information leak (of uninitialized memory contents) in the libvncclient/rfbproto.c ConnectToRFBRepeater function.","modified":"2026-01-20T17:01:45.120584Z","published":"2020-06-17T16:15:00Z","upstream":["CVE-2018-21247"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2018-21247"},{"type":"REPORT","url":"https://github.com/LibVNC/libvncserver/compare/LibVNCServer-0.9.12...LibVNCServer-0.9.13"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2018-21247"}],"affected":[{"package":{"name":"x11vnc","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/x11vnc@0.9.13-1.1?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.13-1.1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.13-1.1","binary_name":"x11vnc"},{"binary_version":"0.9.13-1.1","binary_name":"x11vnc-data"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"}},{"package":{"name":"libvncserver","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/libvncserver@0.9.10+dfsg-3ubuntu0.16.04.6?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"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","0.9.10+dfsg-3ubuntu0.16.04.3","0.9.10+dfsg-3ubuntu0.16.04.4","0.9.10+dfsg-3ubuntu0.16.04.5","0.9.10+dfsg-3ubuntu0.16.04.6"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.10+dfsg-3ubuntu0.16.04.6","binary_name":"libvncclient1"},{"binary_version":"0.9.10+dfsg-3ubuntu0.16.04.6","binary_name":"libvncserver-config"},{"binary_version":"0.9.10+dfsg-3ubuntu0.16.04.6","binary_name":"libvncserver-dev"},{"binary_version":"0.9.10+dfsg-3ubuntu0.16.04.6","binary_name":"libvncserver1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"}},{"package":{"name":"x11vnc","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/x11vnc@0.9.13-1.2ubuntu0.1~esm1?arch=source&distro=esm-apps/xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.13-1.2build1","0.9.13-1.2ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.13-1.2ubuntu0.1~esm1","binary_name":"x11vnc"},{"binary_version":"0.9.13-1.2ubuntu0.1~esm1","binary_name":"x11vnc-data"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"}},{"package":{"name":"libvncserver","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/libvncserver@0.9.11+dfsg-1ubuntu1.4?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.11+dfsg-1","0.9.11+dfsg-1ubuntu1","0.9.11+dfsg-1ubuntu1.1","0.9.11+dfsg-1ubuntu1.2","0.9.11+dfsg-1ubuntu1.3","0.9.11+dfsg-1ubuntu1.4"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.11+dfsg-1ubuntu1.4","binary_name":"libvncclient1"},{"binary_version":"0.9.11+dfsg-1ubuntu1.4","binary_name":"libvncserver-config"},{"binary_version":"0.9.11+dfsg-1ubuntu1.4","binary_name":"libvncserver-dev"},{"binary_version":"0.9.11+dfsg-1ubuntu1.4","binary_name":"libvncserver1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"}},{"package":{"name":"x11vnc","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/x11vnc@0.9.13-3ubuntu0.1~esm1?arch=source&distro=esm-apps/bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.13-2","0.9.13-2build1","0.9.13-3","0.9.13-3ubuntu0.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.13-3ubuntu0.1~esm1","binary_name":"x11vnc"},{"binary_version":"0.9.13-3ubuntu0.1~esm1","binary_name":"x11vnc-data"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"}},{"package":{"name":"libvncserver","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/libvncserver@0.9.12+dfsg-9ubuntu0.3?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["0.9.11+dfsg-1.3","0.9.12+dfsg-3ubuntu3","0.9.12+dfsg-6","0.9.12+dfsg-7","0.9.12+dfsg-8","0.9.12+dfsg-9","0.9.12+dfsg-9ubuntu0.1","0.9.12+dfsg-9ubuntu0.2","0.9.12+dfsg-9ubuntu0.3"],"ecosystem_specific":{"binaries":[{"binary_version":"0.9.12+dfsg-9ubuntu0.3","binary_name":"libvncclient1"},{"binary_version":"0.9.12+dfsg-9ubuntu0.3","binary_name":"libvncserver-dev"},{"binary_version":"0.9.12+dfsg-9ubuntu0.3","binary_name":"libvncserver1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2018/UBUNTU-CVE-2018-21247.json"}},{"package":{"name":"veyon","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/veyon@4.3.1+repack1-2build2?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.2.4+repack1-2","4.2.5+repack1-1","4.3.1+repack1-1","4.3.1+repack1-2","4.3.1+re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