{"id":"UBUNTU-CVE-2021-4129","details":"Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported memory safety bugs present in Firefox 94. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox \u003c 95, Firefox ESR \u003c 91.4.0, and Thunderbird \u003c 91.4.0.","modified":"2026-04-22T14:57:47.845763Z","published":"2022-01-21T00:00:00Z","related":["USN-5246-1","USN-5248-1"],"upstream":["CVE-2021-4129"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2021-4129"},{"type":"REPORT","url":"https://www.mozilla.org/en-US/security/advisories/mfsa2021-54/#CVE-2021-4129"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5246-1"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-5248-1"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2021-4129"}],"affected":[{"package":{"name":"thunderbird","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/thunderbird@1:91.5.0+build1-0ubuntu0.18.04.1?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:91.5.0+build1-0ubuntu0.18.04.1"}]}],"versions":["1:52.4.0+build1-0ubuntu2","1:52.6.0+build1-0ubuntu1","1:52.7.0+build1-0ubuntu1","1:52.8.0+build1-0ubuntu0.18.04.1","1:52.9.1+build3-0ubuntu0.18.04.1","1:60.2.1+build1-0ubuntu0.18.04.2","1:60.4.0+build2-0ubuntu0.18.04.1","1:60.5.1+build2-0ubuntu0.18.04.1","1:60.6.1+build2-0ubuntu0.18.04.1","1:60.7.0+build1-0ubuntu0.18.04.1","1:60.7.1+build1-0ubuntu0.18.04.1","1:60.7.2+build2-0ubuntu0.18.04.1","1:60.8.0+build1-0ubuntu0.18.04.1","1:60.9.0+build1-0ubuntu0.18.04.1","1:68.2.1+build1-0ubuntu0.18.04.1","1:68.2.2+build1-0ubuntu0.18.04.1","1:68.4.1+build1-0ubuntu0.18.04.1","1:68.7.0+build1-0ubuntu0.18.04.1","1:68.8.0+build2-0ubuntu0.18.04.2","1:68.10.0+build1-0ubuntu0.18.04.1","1:78.8.1+build1-0ubuntu0.18.04.1","1:78.11.0+build1-0ubuntu0.18.04.2","1:78.13.0+build1-0ubuntu0.18.04.1","1:78.14.0+build1-0ubuntu0.18.04.1","1:78.14.0+build1-0ubuntu0.18.04.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"thunderbird","binary_version":"1:91.5.0+build1-0ubuntu0.18.04.1"},{"binary_name":"thunderbird-gnome-support","binary_version":"1:91.5.0+build1-0ubuntu0.18.04.1"},{"binary_name":"thunderbird-mozsymbols","binary_version":"1:91.5.0+build1-0ubuntu0.18.04.1"},{"binary_version":"1:91.5.0+build1-0ubuntu0.18.04.1","binary_name":"xul-ext-calendar-timezones"},{"binary_name":"xul-ext-gdata-provider","binary_version":"1:91.5.0+build1-0ubuntu0.18.04.1"},{"binary_name":"xul-ext-lightning","binary_version":"1:91.5.0+build1-0ubuntu0.18.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-4129.json"}},{"package":{"name":"thunderbird","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/thunderbird@1:91.5.0+build1-0ubuntu0.20.04.1?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:91.5.0+build1-0ubuntu0.20.04.1"}]}],"versions":["1:68.1.2+build1-0ubuntu1","1:68.1.2+build1-0ubuntu2","1:68.2.1+build1-0ubuntu1","1:68.2.2+build1-0ubuntu1","1:68.3.0+build2-0ubuntu1","1:68.3.1+build1-0ubuntu2","1:68.4.1+build1-0ubuntu1","1:68.4.2+build2-0ubuntu1","1:68.5.0+build1-0ubuntu1","1:68.6.0+build2-0ubuntu1","1:68.7.0+build1-0ubuntu1","1:68.7.0+build1-0ubuntu2","1:68.8.0+build2-0ubuntu0.20.04.2","1:68.10.0+build1-0ubuntu0.20.04.1","1:78.7.1+build1-0ubuntu0.20.04.1","1:78.8.1+build1-0ubuntu0.20.04.1","1:78.11.0+build1-0ubuntu0.20.04.2","1:78.13.0+build1-0ubuntu0.20.04.2","1:78.14.0+build1-0ubuntu0.20.04.1","1:78.14.0+build1-0ubuntu0.20.04.2"],"ecosystem_specific":{"availability":"No subscription required","binaries":[{"binary_name":"thunderbird","binary_version":"1:91.5.0+build1-0ubuntu0.20.04.1"},{"binary_name":"thunderbird-gnome-support","binary_version":"1:91.5.0+build1-0ubuntu0.20.04.1"},{"binary_name":"thunderbird-mozsymbols","binary_version":"1:91.5.0+build1-0ubuntu0.20.04.1"},{"binary_name":"xul-ext-calendar-timezones","binary_version":"1:91.5.0+build1-0ubuntu0.20.04.1"},{"binary_name":"xul-ext-gdata-provider","binary_version":"1:91.5.0+build1-0ubuntu0.20.04.1"},{"binary_name":"xul-ext-lightning","binary_version":"1:91.5.0+build1-0ubuntu0.20.04.1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2021/UBUNTU-CVE-2021-4129.json"}}],"schema_version":"1.7.5","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":"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":"low"}]}