{"id":"CVE-2020-12397","aliases":["ALPINE-CVE-2020-12397","DEBIAN-CVE-2020-12397","DLA-2206-1","DSA-4683-1","EUVD-2020-4709","GHSA-mg46-fgw7-xxfg","MGASA-2020-0209","RHSA-2020:2046","RHSA-2020:2047","RHSA-2020:2048","RHSA-2020:2049","RHSA-2020:2050","SUSE-SU-2020:1225-1","UBUNTU-CVE-2020-12397","USN-4373-1","openSUSE-SU-2020:0643-1","openSUSE-SU-2024:10601-1"],"status":"published","title":"By encoding Unicode whitespace characters within the From email header, an attacker can spoof the...","description":"By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird displays. This vulnerability affects Thunderbird \u003c 68.8.0.","severity":{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00612,"percentile":0.49669,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-346"],"published":"2020-05-07T00:00:00Z","modified":"2026-11-03T06:32:30Z","fixes":[{"ecosystem":"Alpine:v3.16","package":"thunderbird","fixed_in":["68.8.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"thunderbird","fixed_in":["68.8.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"thunderbird","fixed_in":["68.8.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"thunderbird","fixed_in":["68.8.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"thunderbird","fixed_in":["68.8.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"thunderbird","fixed_in":["68.8.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"thunderbird","fixed_in":["68.8.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"thunderbird","fixed_in":["68.8.0-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"thunderbird","fixed_in":["1:68.8.0-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"thunderbird","fixed_in":["1:68.8.0-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"thunderbird","fixed_in":["1:68.8.0-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:16.04:LTS","package":"thunderbird","fixed_in":["1:68.8.0+build2-0ubuntu0.16.04.2"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"thunderbird","fixed_in":["1:68.8.0+build2-0ubuntu0.18.04.2"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"thunderbird","fixed_in":["1:68.8.0+build2-0ubuntu0.20.04.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.16","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"68.8.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.17","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"68.8.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"68.8.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"68.8.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"68.8.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"68.8.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"68.8.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"68.8.0-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:68.8.0-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:68.8.0-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:68.8.0-1"}]}]},{"source":"osv","ecosystem":"Debian:8","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:68.8.0-1~deb8u1"}]}],"versions":["1.5-4","1.5.0.2-1","1.5.0.2-2","1.5.0.2-3","1.5.0.4-1","1.5.0.4-2","1.5.0.4-3","1.5.0.5-1","1.5.0.7-1","1.5.0.7-2","1:52.4.0-1","1:52.4.0-1~deb7u1","1:52.4.0-1~deb8u1","1:52.4.0-1~deb9u1","1:52.4.0-2~exp1","1:52.5.0-1","1:52.5.0-1~deb7u1","1:52.5.0-1~deb8u1","1:52.5.0-1~deb9u1","1:52.5.2-1","1:52.5.2-1~deb7u1","1:52.5.2-2","1:52.5.2-2~deb8u1","1:52.5.2-2~deb9u1","1:52.6.0-1","1:52.6.0-1+alpha.1","1:52.6.0-1+alpha.2","1:52.6.0-1~deb7u1","1:52.6.0-1~deb8u1","1:52.6.0-1~deb9u1","1:52.7.0-1","1:52.7.0-1~deb7u1","1:52.7.0-1~deb8u1","1:52.7.0-1~deb9u1","1:52.8.0-1","1:52.8.0-1~deb7u1","1:52.8.0-1~deb8u1","1:52.8.0-1~deb9u1","1:52.9.0-1","1:52.9.1-1","1:52.9.1-1~deb8u1","1:52.9.1-1~deb9u1","1:58.0~b3-1","1:60.0-1","1:60.0-2","1:60.0-2~deb9u1","1:60.0-3","1:60.0-3~deb9u1","1:60.0~b10-1","1:60.0~b2-1","1:60.0~b3-1","1:60.0~b4-1","1:60.0~b5-1","1:60.0~b6-1","1:60.0~b9-1","1:60.0~b9-2","1:60.2.1-1","1:60.2.1-2~deb9u1","1:60.3.0-1","1:60.3.0-1~deb8u1","1:60.3.0-1~deb9u1","1:60.3.1-1","1:60.4.0-1","1:60.4.0-1~deb8u1","1:60.4.0-1~deb9u1","1:60.5.0-1","1:60.5.0-2","1:60.5.0-3","1:60.5.1-1","1:60.5.1-1~deb8u1","1:60.5.1-1~deb9u1","1:60.6.1-1","1:60.6.1-1~deb8u1","1:60.6.1-1~deb9u1","1:60.7.0-1","1:60.7.0-1~deb8u1","1:60.7.0-1~deb9u1","1:60.7.1-1","1:60.7.1-1~deb8u1","1:60.7.1-1~deb9u1","1:60.7.2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encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird displays. This vulnerability affects Thunderbird \u003c 68.8.0.","status":"published","published":"2020-05-22T18:57:12Z","modified":"2024-08-04T11:56:52.038Z","updated_at":"2026-11-02T14:35:53.236501Z"}],"euvd":[{"id":"EUVD-2020-4709","description":"By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird displays. This vulnerability affects Thunderbird \u003c 68.8.0.","status":"published","published":"2020-05-22T18:57:12Z","modified":"2024-08-04T11:56:52Z","updated_at":"2026-11-03T03:07:40.388635Z"}],"ghsa":[{"id":"GHSA-mg46-fgw7-xxfg","title":"By encoding Unicode whitespace characters within the From email header, an attacker can spoof the...","description":"By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird displays. This vulnerability affects Thunderbird \u003c 68.8.0.","status":"published","published":"2022-05-24T17:18:34Z","modified":"2023-02-28T15:30:23Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium"}],"cwes":["CWE-346"],"updated_at":"2026-11-02T14:54:14.599346Z"}],"nvd":[{"id":"CVE-2020-12397","description":"By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird displays. 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This vulnerability affects Thunderbird \u003c 68.8.0.","status":"published","published":"2020-05-22T19:15:15.58Z","modified":"2026-11-03T06:32:30.633608172Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-03T07:17:41.158523Z"},{"id":"CVE-2020-12397","description":"By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird displays. 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This vulnerability affects Thunderbird \u003c 68.8.0.","status":"published","published":"2020-05-22T19:15:15.58Z","modified":"2026-10-26T12:00:28.175498149Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:32.862554Z"},{"id":"RHSA-2020:2046","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T04:09:35Z","modified":"2026-06-29T10:30:05Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:53:07.072948Z"},{"id":"RHSA-2020:2047","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T04:09:16Z","modified":"2026-06-29T10:30:05Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:53:07.072948Z"},{"id":"RHSA-2020:2048","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T04:09:08Z","modified":"2026-06-29T10:30:06Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:53:07.072948Z"},{"id":"RHSA-2020:2049","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T04:09:27Z","modified":"2026-06-29T10:30:06Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:53:07.072948Z"},{"id":"RHSA-2020:2050","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T04:09:43Z","modified":"2026-06-29T10:30:07Z","cvss":[{"version":"3.1","score":9.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","level":"critical"}],"updated_at":"2026-11-02T15:53:07.072948Z"},{"id":"UBUNTU-CVE-2020-12397","description":"By encoding Unicode whitespace characters within the From email header, an attacker can spoof the sender email address that Thunderbird displays. This vulnerability affects Thunderbird \u003c 68.8.0.","status":"published","published":"2020-05-07T00:00:00Z","modified":"2026-04-22T12:28:14.949835Z","cvss":[{"version":"3.1","score":4.3,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:54:22.804634Z"},{"id":"DLA-2206-1","title":"thunderbird - security update","status":"published","published":"2020-05-09T00:00:00Z","modified":"2026-03-09T01:22:57.133712Z","updated_at":"2026-11-02T15:46:10.227108Z"},{"id":"DSA-4683-1","title":"thunderbird - security update","status":"published","published":"2020-05-08T00:00:00Z","modified":"2026-03-09T02:10:07.680747Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2020-0209","title":"Updated thunderbird packages fix security vulnerabilities","description":"Updated thunderbird packages fix security vulnerabilities:\n\nA buffer overflow could occur when parsing and validating SCTP chunks\nin WebRTC. This could have led to memory corruption and a potentially\nexploitable crash (CVE-2020-6831).\n\nA race condition when running shutdown code for Web Worker led to a\nuse-after-free vulnerability. This resulted in a potentially exploitable\ncrash (CVE-2020-12387).\n\nThe 'Copy as cURL' feature of Devtools' network tab did not properly escape\nthe HTTP POST data of a request, which can be controlled by the website.\nIf a user used the 'Copy as cURL' feature and pasted the command into a\nterminal, it could have resulted in the disclosure of local files\n(CVE-2020-12392).\n\nMozilla developers and community members Alexandru Michis, Jason Kratzer,\nphilipp, Ted Campbell, Bas Schouten, André Bargull, and Karl Tomlinson\nreported memory safety bugs present in Thunderbird ESR 68.7. Some of these\nbugs showed evidence of memory corruption and we presume that with enough\neffort some of these could have been exploited to run arbitrary code\n(CVE-2020-12395).\n\nBy encoding Unicode whitespace characters within the From email header,\nan attacker can spoof the sender email address that Thunderbird displays\n(CVE-2020-12397).\n","status":"published","published":"2020-05-08T10:57:54Z","modified":"2026-04-16T04:43:14.952013752Z","updated_at":"2026-11-02T15:49:41.151324Z"},{"id":"openSUSE-SU-2020:0643-1","title":"Security update for MozillaThunderbird","description":"This update for MozillaThunderbird fixes the following issues:\n- Update to 68.8.0 ESR\n  MFSA 2020-18 (bsc#1171186)\n  * CVE-2020-12397 (bmo#1617370)\n    Sender Email Address Spoofing using encoded Unicode\n    characters\n  * CVE-2020-12387 (bmo#1545345)\n    Use-after-free during worker shutdown\n  * CVE-2020-6831 (bmo#1632241)\n    Buffer overflow in SCTP chunk input validation\n  * CVE-2020-12392 (bmo#1614468)\n    Arbitrary local file access with 'Copy as cURL'\n  * CVE-2020-12393 (bmo#1615471)\n    Devtools' 'Copy as cURL' feature did not fully escape\n    website-controlled data, potentially leading to command\n    injection\n  * CVE-2020-12395 (bmo#1595886, bmo#1611482, bmo#1614704,\n    bmo#1624098, bmo#1625749, bmo#1626382, bmo#1628076,\n    bmo#1631508)\n    Memory safety bugs fixed in Thunderbird 68.8.0\n\n\nThis update was imported from the SUSE:SLE-15:Update update project.","status":"published","published":"2020-05-09T22:21:15Z","modified":"2025-05-07T18:11:22.220499Z","updated_at":"2026-11-02T16:58:31.152112Z"},{"id":"openSUSE-SU-2024:10601-1","title":"MozillaThunderbird-91.1.1-1.1 on GA media","description":"These are all security issues fixed in the MozillaThunderbird-91.1.1-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2024-06-15T00:00:00Z","modified":"2025-05-07T18:08:23.188336Z","updated_at":"2026-11-02T16:58:34.487567Z"},{"id":"SUSE-SU-2020:1225-1","title":"Security update for MozillaThunderbird","description":"This update for MozillaThunderbird fixes the following issues:\n- Update to 68.8.0 ESR\n  MFSA 2020-18 (bsc#1171186)\n  * CVE-2020-12397 (bmo#1617370)\n    Sender Email Address Spoofing using encoded Unicode\n    characters\n  * CVE-2020-12387 (bmo#1545345)\n    Use-after-free during worker shutdown\n  * CVE-2020-6831 (bmo#1632241)\n    Buffer overflow in SCTP chunk input validation\n  * CVE-2020-12392 (bmo#1614468)\n    Arbitrary local file access with 'Copy as cURL'\n  * CVE-2020-12393 (bmo#1615471)\n    Devtools' 'Copy as cURL' feature did not fully escape\n    website-controlled data, potentially leading to command\n    injection\n  * CVE-2020-12395 (bmo#1595886, bmo#1611482, bmo#1614704,\n    bmo#1624098, bmo#1625749, bmo#1626382, bmo#1628076,\n    bmo#1631508)\n    Memory safety bugs fixed in Thunderbird 68.8.0\n\n","status":"published","published":"2020-05-08T08:48:22Z","modified":"2026-02-04T02:37:06.551375Z","updated_at":"2026-11-02T15:53:47.634847Z"},{"id":"USN-4373-1","title":"thunderbird vulnerabilities","description":"Multiple security issues were discovered in Thunderbird. If a user were\ntricked in to opening a specially crafted website in a browsing context,\nan attacker could potentially exploit these to cause a denial of service,\nor execute arbitrary code. (CVE-2020-6831, CVE-2020-12387, CVE-2020-12395)\n\nIt was discovered that the Devtools’ ‘Copy as cURL’ feature did not\nproperly escape the HTTP POST data of a request. If a user were tricked\nin to using the ‘Copy as cURL’ feature to copy and paste a command with\nspecially crafted data in to a terminal, an attacker could potentially\nexploit this to obtain sensitive information from local files.\n(CVE-2020-12392)\n\nIt was discovered that Thunderbird did not correctly handle Unicode\nwhitespace characters within the From email header. An attacker could\npotentially exploit this to spoof the sender email address that\nThunderbird displays. (CVE-2020-12397)\n","status":"published","published":"2020-05-26T14:33:47Z","modified":"2026-04-22T10:05:55.497663Z","updated_at":"2026-11-02T16:58:14.547547Z"}]}}