{"id":"UBUNTU-CVE-2020-26117","details":"In rfb/CSecurityTLS.cxx and rfb/CSecurityTLS.java in TigerVNC before 1.11.0, viewers mishandle TLS certificate exceptions. They store the certificates as authorities, meaning that the owner of a certificate could impersonate any server after a client had added an exception.","modified":"2026-02-04T23:58:43.089443Z","published":"2020-09-27T04:15:00Z","related":["USN-5965-1"],"upstream":["CVE-2020-26117"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2020-26117"},{"type":"REPORT","url":"https://bugzilla.opensuse.org/show_bug.cgi?id=1176733"},{"type":"REPORT","url":"https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb"},{"type":"REPORT","url":"https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b"},{"type":"REPORT","url":"https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba"},{"type":"REPORT","url":"https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e"},{"type":"REPORT","url":"https://github.com/TigerVNC/tigervnc/commit/20dea801e747318525a5859fe4f37c52b05310cb"},{"type":"REPORT","url":"https://github.com/TigerVNC/tigervnc/commit/7399eab79a4365434d26494fa1628ce1eb91562b"},{"type":"REPORT","url":"https://github.com/TigerVNC/tigervnc/commit/b30f10c681ec87720cff85d490f67098568a9cba"},{"type":"REPORT","url":"https://github.com/TigerVNC/tigervnc/commit/f029745f63ac7d22fb91639b2cb5b3ab56134d6e"},{"type":"REPORT","url":"https://github.com/TigerVNC/tigervnc/releases/tag/v1.11.0"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5965-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2020-26117"}],"affected":[{"package":{"name":"tigervnc","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/tigervnc@1.7.0+dfsg-8ubuntu2?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.7.0+dfsg-7ubuntu1","1.7.0+dfsg-8ubuntu2"],"ecosystem_specific":{"binaries":[{"binary_name":"tigervnc-common","binary_version":"1.7.0+dfsg-8ubuntu2"},{"binary_name":"tigervnc-scraping-server","binary_version":"1.7.0+dfsg-8ubuntu2"},{"binary_name":"tigervnc-standalone-server","binary_version":"1.7.0+dfsg-8ubuntu2"},{"binary_name":"tigervnc-viewer","binary_version":"1.7.0+dfsg-8ubuntu2"},{"binary_name":"tigervnc-xorg-extension","binary_version":"1.7.0+dfsg-8ubuntu2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-26117.json"}},{"package":{"name":"tigervnc","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/tigervnc@1.10.1+dfsg-3ubuntu0.1+esm2?arch=source&distro=esm-apps/focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1.10.1+dfsg-3ubuntu0.1+esm2"}]}],"versions":["1.9.0+dfsg-3","1.9.0+dfsg-4","1.10.1+dfsg-1","1.10.1+dfsg-2","1.10.1+dfsg-3"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro: https://ubuntu.com/pro","binaries":[{"binary_name":"tigervnc-common","binary_version":"1.10.1+dfsg-3ubuntu0.1+esm2"},{"binary_name":"tigervnc-scraping-server","binary_version":"1.10.1+dfsg-3ubuntu0.1+esm2"},{"binary_name":"tigervnc-standalone-server","binary_version":"1.10.1+dfsg-3ubuntu0.1+esm2"},{"binary_name":"tigervnc-viewer","binary_version":"1.10.1+dfsg-3ubuntu0.1+esm2"},{"binary_name":"tigervnc-xorg-extension","binary_version":"1.10.1+dfsg-3ubuntu0.1+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2020/UBUNTU-CVE-2020-26117.json"}}],"schema_version":"1.7.3","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N"},{"type":"Ubuntu","score":"medium"}]}