{"schema_version":"1.7.5","id":"CVE-2020-6821","published":"2020-04-24T16:15:13.510Z","modified":"2026-04-16T04:36:58.276134120Z","related":["SUSE-SU-2020:0971-1","SUSE-SU-2020:0978-1","SUSE-SU-2020:1027-1","SUSE-SU-2020:14339-1","openSUSE-SU-2020:0493-1","openSUSE-SU-2020:0520-1","openSUSE-SU-2020:0544-1","openSUSE-SU-2024:10600-1","openSUSE-SU-2024:10601-1","openSUSE-SU-2024:14572-1"],"details":"When reading from areas partially or fully outside the source resource with WebGL's <code>copyTexSubImage</code> method, the specification requires the returned values be zero. Previously, this memory was uninitialized, leading to potentially sensitive data disclosure. This vulnerability affects Thunderbird < 68.7.0, Firefox ESR < 68.7, and Firefox < 75.","affected":[{"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2020-6821.json","unresolved_ranges":[{"events":[{"introduced":"0"},{"fixed":"75.0"}]},{"events":[{"introduced":"0"},{"fixed":"68.7.0"}]},{"events":[{"introduced":"0"},{"fixed":"68.7.0"}]}]}}],"references":[{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-14/"},{"type":"ADVISORY","url":"https://usn.ubuntu.com/4335-1/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-12/"},{"type":"ADVISORY","url":"https://www.mozilla.org/security/advisories/mfsa2020-13/"},{"type":"REPORT","url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1625404"}],"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N"}]}