{"id":"CVE-2020-26970","aliases":["ALPINE-CVE-2020-26970","DEBIAN-CVE-2020-26970","DLA-2479-1","DSA-4802-1","EUVD-2020-19494","GHSA-w8wp-h42w-f3m4","MGASA-2020-0450","RHSA-2020:5398","RHSA-2020:5399","RHSA-2020:5400","RHSA-2020:5644","RHSA-2020:5645","SUSE-SU-2020:3642-1","SUSE-SU-2020:3935-1","UBUNTU-CVE-2020-26970","openSUSE-SU-2024:10601-1"],"status":"published","title":"When reading SMTP server status codes, Thunderbird writes an integer value to a position on the...","description":"When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird \u003c 78.5.1.","severity":{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01247,"percentile":0.69713,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2020-12-03T00:00:00Z","modified":"2026-11-03T06:31:42Z","fixes":[{"ecosystem":"Alpine:v3.16","package":"thunderbird","fixed_in":["78.5.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"thunderbird","fixed_in":["78.5.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"thunderbird","fixed_in":["78.5.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"thunderbird","fixed_in":["78.5.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"thunderbird","fixed_in":["78.5.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"thunderbird","fixed_in":["78.5.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"thunderbird","fixed_in":["78.5.1-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"thunderbird","fixed_in":["78.5.1-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"thunderbird","fixed_in":["1:78.5.1-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"thunderbird","fixed_in":["1:78.5.1-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"thunderbird","fixed_in":["1:78.5.1-1"],"sources":["osv"]},{"ecosystem":"Debian:9","package":"thunderbird","fixed_in":["1:78.5.1-1~deb9u1"],"sources":["osv"]},{"ecosystem":"Debian:10","package":"thunderbird","fixed_in":["1:78.5.1-1~deb10u1"],"sources":["osv"]},{"ecosystem":"Mageia:7","package":"thunderbird","fixed_in":["78.5.1-1.mga7"],"sources":["osv"]},{"ecosystem":"Mageia:7","package":"thunderbird-l10n","fixed_in":["78.5.1-1.mga7"],"sources":["osv"]},{"ecosystem":"Mageia:7","package":"rootcerts","fixed_in":["20201201.00-1.mga7"],"sources":["osv"]},{"ecosystem":"Red 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cve/CVE-2020-26976","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6463","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6514","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6792","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6793","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6794","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6795","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6797","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6798","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6800","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6805","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6806","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6807","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6811","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6812","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6814","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6819","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6820","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6821","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6822","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6825","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2020-6831","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23953","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23954","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23960","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23961","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23964","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23968","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23969","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23973","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23978","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23981","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23982","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23984","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23987","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23991","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23993","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23994","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23995","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23998","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-23999","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-24002","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29945","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29946","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29948","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29956","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29957","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29964","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29967","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29969","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29970","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29976","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29980","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29984","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29985","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29986","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29988","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29989","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-29991","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-30547","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-38492","tags":["web"]},{"url":"https://www.suse.com/security/cve/CVE-2021-38495","tags":["web"]}],"sources":{"cve":[{"id":"CVE-2020-26970","description":"When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird \u003c 78.5.1.","status":"published","published":"2020-12-09T00:26:43Z","modified":"2024-08-04T16:03:23.173Z","updated_at":"2026-11-02T14:35:46.129376Z"}],"euvd":[{"id":"EUVD-2020-19494","description":"When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird \u003c 78.5.1.","status":"published","published":"2020-12-09T00:26:43Z","modified":"2024-08-04T16:03:23Z","updated_at":"2026-11-03T03:07:14.105511Z"}],"ghsa":[{"id":"GHSA-w8wp-h42w-f3m4","title":"When reading SMTP server status codes, Thunderbird writes an integer value to a position on the...","description":"When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird \u003c 78.5.1.","status":"published","published":"2022-05-24T17:35:38Z","modified":"2023-01-29T05:04:37Z","cwes":["CWE-787"],"updated_at":"2026-11-02T14:45:36.114986Z"}],"nvd":[{"id":"CVE-2020-26970","description":"When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird \u003c 78.5.1.","status":"published","published":"2020-12-09T01:15:13.817Z","modified":"2026-06-17T03:08:38.577Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high","assessor":"primary"},{"version":"2.0","score":9.3,"vector":"AV:N/AC:M/Au:N/C:C/I:C/A:C","level":"high","assessor":"primary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:06:27.10541Z"}],"osv":[{"id":"ALPINE-CVE-2020-26970","description":"When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird \u003c 78.5.1.","status":"published","published":"2020-12-09T01:15:13.817Z","modified":"2026-11-03T06:31:42.837116419Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-03T07:18:15.355745Z"},{"id":"CVE-2020-26970","description":"When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird \u003c 78.5.1.","status":"published","published":"2020-12-09T01:15:13.817Z","modified":"2026-04-16T04:36:53.978906793Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:44:16.248747Z"},{"id":"DEBIAN-CVE-2020-26970","description":"When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird \u003c 78.5.1.","status":"published","published":"2020-12-09T01:15:13.817Z","modified":"2026-10-26T12:02:41.51579783Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:45:33.729655Z"},{"id":"RHSA-2020:5398","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T05:12:03Z","modified":"2025-11-22T12:13:52Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"RHSA-2020:5399","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T05:12:17Z","modified":"2025-11-22T12:13:53Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"RHSA-2020:5400","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T05:12:10Z","modified":"2026-06-26T10:52:12Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"RHSA-2020:5644","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T05:14:43Z","modified":"2025-11-22T12:14:54Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"RHSA-2020:5645","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T05:14:50Z","modified":"2025-11-22T12:14:55Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:53:07.57369Z"},{"id":"UBUNTU-CVE-2020-26970","description":"When reading SMTP server status codes, Thunderbird writes an integer value to a position on the stack that is intended to contain just one byte. Depending on processor architecture and stack layout, this leads to stack corruption that may be exploitable. This vulnerability affects Thunderbird \u003c 78.5.1.","status":"published","published":"2020-12-09T01:15:00Z","modified":"2026-04-22T12:36:59.963609Z","cvss":[{"version":"3.1","score":8.8,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","level":"high"}],"updated_at":"2026-11-02T15:54:24.541803Z"},{"id":"DLA-2479-1","title":"thunderbird - security update","status":"published","published":"2020-12-04T00:00:00Z","modified":"2026-03-09T01:21:01.486773Z","updated_at":"2026-11-02T15:46:10.712745Z"},{"id":"DSA-4802-1","title":"thunderbird - security update","status":"published","published":"2020-12-03T00:00:00Z","modified":"2026-03-09T02:09:46.839964Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2020-0450","title":"Updated thunderbird packages fix security vulnerability","description":"When reading SMTP server status codes, Thunderbird writes an integer value to a\nposition on the stack that is intended to contain just one byte. Depending on\nprocessor architecture and stack layout, this leads to stack corruption that\nmay be exploitable (CVE-2020-26970).\n","status":"published","published":"2020-12-05T19:46:49Z","modified":"2026-04-16T04:44:23.323695889Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"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-2020:3642-1","title":"Security update for MozillaThunderbird","description":"This update for MozillaThunderbird fixes the following issues:\n\n- Mozilla Thunderbird was updated to 78.5.1 (MFSA 2020-53, bsc#1179530)\n- CVE-2020-26970: Fixed a stack overflow due to incorrect parsing of SMTP server response codes.\n- Various bug fixes\n","status":"published","published":"2020-12-07T12:30:26Z","modified":"2026-02-04T03:36:46.238841Z","updated_at":"2026-11-02T15:53:48.690034Z"},{"id":"SUSE-SU-2020:3935-1","title":"Security update for MozillaThunderbird","description":"This update for MozillaThunderbird fixes the following issues:\n\n- Mozilla Thunderbird 78.6\n  * new: MailExtensions: Added\n    browser.windows.openDefaultBrowser() (bmo#1664708)\n  * changed: Thunderbird now only shows quota exceeded\n    indications on the main window (bmo#1671748)\n  * changed: MailExtensions: menus API enabled in messages being\n    composed (bmo#1670832)\n  * changed: MailExtensions: Honor allowScriptsToClose argument\n    in windows.create API function (bmo#1675940)\n  * changed: MailExtensions: APIs that returned an accountId will\n    reflect the account the message belongs to, not what is\n    stored in message headers (bmo#1644032)\n  * fixed: Keyboard shortcut for toggling message 'read' status\n    not shown in menus (bmo#1619248)\n  * fixed: OpenPGP: After importing a secret key, Key Manager\n    displayed properties of the wrong key (bmo#1667054)\n  * fixed: OpenPGP: Inline PGP parsing improvements (bmo#1660041)\n  * fixed: OpenPGP: Discovering keys online via Key Manager\n    sometimes failed on Linux (bmo#1634053)\n  * fixed: OpenPGP: Encrypted attachment 'Decrypt and Open/Save\n    As' did not work (bmo#1663169)\n  * fixed: OpenPGP: Importing keys failed on macOS (bmo#1680757)\n  * fixed: OpenPGP: Verification of clear signed UTF-8 text\n    failed (bmo#1679756)\n  * fixed: Address book: Some columns incorrectly displayed no\n    data (bmo#1631201)\n  * fixed: Address book: The address book view did not update\n    after changing the name format in the menu (bmo#1678555)\n  * fixed: Calendar: Could not import an ICS file into a CalDAV\n    calendar (bmo#1652984)\n  * fixed: Calendar: Two 'Home' calendars were visible on a new\n    profile (bmo#1656782)\n  * fixed: Calendar: Dark theme was incomplete on Linux\n    (bmo#1655543)\n  * fixed: Dark theme did not apply to new mail notification\n    popups (bmo#1681083)\n  * fixed: Folder icon, message list, and contact side bar visual\n    improvements (bmo#1679436)\n  * fixed: MailExtensions: HTTP refresh in browser content tabs\n    did not work (bmo#1667774)\n  * fixed: MailExtensions: messageDisplayScripts failed to run in\n    main window (bmo#1674932)\n  * fixed: Various security fixes\n  MFSA 2020-56 (bsc#1180039)\n  * CVE-2020-16042 (bmo#1679003)\n    Operations on a BigInt could have caused uninitialized memory\n    to be exposed\n  * CVE-2020-26971 (bmo#1663466)\n    Heap buffer overflow in WebGL\n  * CVE-2020-26973 (bmo#1680084)\n    CSS Sanitizer performed incorrect sanitization\n  * CVE-2020-26974 (bmo#1681022)\n    Incorrect cast of StyleGenericFlexBasis resulted in a heap\n    use-after-free\n  * CVE-2020-26978 (bmo#1677047)\n    Internal network hosts could have been probed by a malicious\n    webpage\n  * CVE-2020-35111 (bmo#1657916)\n    The proxy.onRequest API did not catch view-source URLs\n  * CVE-2020-35112 (bmo#1661365)\n    Opening an extension-less download may have inadvertently\n    launched an executable instead\n  * CVE-2020-35113 (bmo#1664831, bmo#1673589)\n    Memory safety bugs fixed in Thunderbird 78.6\n\nMozilla Thunderbird 78.5.1\n\n* new: OpenPGP: Added option to disable email subject\n  encryption (bmo#1666073)\n* changed: OpenPGP public key import now supports multi-file\n  selection and bulk accepting imported keys (bmo#1665145)\n* changed: MailExtensions: getComposeDetails will wait for\n  'compose-editor-ready' event (bmo#1675012)\n* fixed: New mail icon was not removed from the system tray at\n  shutdown (bmo#1664586)\n* fixed: 'Place replies in the folder of the message being\n  replied to' did not work when using 'Reply to List'\n  (bmo#522450)\n* fixed: Thunderbird did not honor the 'Run search on server'\n  option when searching messages (bmo#546925)\n* fixed: Highlight color for folders with unread messages\n  wasn't visible in dark theme (bmo#1676697)\n* fixed: OpenPGP: Key were missing from Key Manager\n  (bmo#1674521)\n* fixed: OpenPGP: Option to import keys from clipboard always\n  disabled (bmo#1676842)\n* fixed: The 'Link' button on the large attachments info bar\n  failed to open up Filelink section in Options if the user had\n  not yet configured Filelink (bmo#1677647)\n* fixed: Address book: Printing members of a mailing list\n  resulted in incorrect output (bmo#1676859)\n* fixed: Unable to connect to LDAP servers configured with a\n  self-signed SSL certificate (bmo#1659947)\n* fixed: Autoconfig via LDAP did not work as expected\n  (bmo#1662433)\n* fixed: Calendar: Pressing Ctrl-Enter in the new event dialog\n  would create duplicate events (bmo#1668478)\n* fixed: Various security fixes\n\nMFSA 2020-53 (bsc#1179530)\n* CVE-2020-26970 (bmo#1677338)\n  Stack overflow due to incorrect parsing of SMTP server\n  response codes\n","status":"published","published":"2020-12-25T08:26:55Z","modified":"2026-02-04T02:48:44.871519Z","updated_at":"2026-11-02T15:53:48.690034Z"}]}}