{"id":"UBUNTU-CVE-2020-25708","details":"A divide by zero issue was found to occur in libvncserver-0.9.12. A malicious client could use this flaw to send a specially crafted message that, when processed by the VNC server, would lead to a floating point exception, resulting in a denial of service.","modified":"2026-01-30T00:54:39.583371Z","published":"2020-11-13T00:00:00Z","related":["USN-4636-1"],"upstream":["CVE-2020-25708"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-25708"},{"type":"REPORT","url":"https://github.com/LibVNC/libvncserver/issues/409"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-4636-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-25708"}],"affected":[{"package":{"name":"tightvnc","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/tightvnc@1.3.9-6.5+deb8u1build0.14.04.1~esm1?arch=source&distro=esm-infra-legacy/trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.9-6.4","1.3.9-6.4ubuntu1","1.3.9-6.5+deb8u1build0.14.04.1~esm1"],"ecosystem_specific":{"binaries":[{"binary_version":"1.3.9-6.5+deb8u1build0.14.04.1~esm1","binary_name":"tightvncserver"},{"binary_version":"1.3.9-6.5+deb8u1build0.14.04.1~esm1","binary_name":"xtightvncviewer"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-25708.json"}},{"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/2020/UBUNTU-CVE-2020-25708.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"},{"fixed":"0.9.10+dfsg-3ubuntu0.16.04.6"}]}],"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"],"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"}],"availability":"No 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