{"id":"UBUNTU-CVE-2021-42785","details":"Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server.","modified":"2025-10-24T04:50:36Z","published":"2021-11-23T22:15:00Z","upstream":["CVE-2021-42785"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-42785"},{"type":"REPORT","url":"https://www.tightvnc.com/whatsnew.php"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-42785"}],"affected":[{"package":{"name":"tightvnc","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/tightvnc@1.3.10-0ubuntu3?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.3.10-0ubuntu2","1.3.10-0ubuntu3"],"ecosystem_specific":{"binaries":[{"binary_name":"tightvncserver","binary_version":"1.3.10-0ubuntu3"},{"binary_version":"1.3.10-0ubuntu3","binary_name":"xtightvncviewer"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-42785.json"}}],"schema_version":"1.7.3","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":"Ubuntu","score":"medium"}]}