{"id":"CVE-2021-4129","aliases":["ALPINE-CVE-2021-4129","DEBIAN-CVE-2021-4129","DSA-5026-1","DSA-5034-1","EUVD-2021-34003","GHSA-v25r-h4v7-62rr","MGASA-2021-0551","MGASA-2021-0554","RHSA-2021:5013","RHSA-2021:5014","RHSA-2021:5015","RHSA-2021:5016","RHSA-2021:5017","RHSA-2021:5045","RHSA-2021:5046","RHSA-2021:5047","RHSA-2021:5048","RHSA-2021:5055","RLSA-2021:5013","RLSA-2021:5045","UBUNTU-CVE-2021-4129","USN-5248-1"],"status":"published","title":"Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson...","description":"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.","severity":{"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","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-11","score":0.01062,"percentile":0.65022,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2021-12-08T09:42:58Z","modified":"2026-11-03T06:32:47Z","fixes":[{"ecosystem":"Alpine:v3.16","package":"thunderbird","fixed_in":["91.4.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"thunderbird","fixed_in":["91.4.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"thunderbird","fixed_in":["91.4.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"thunderbird","fixed_in":["91.4.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"thunderbird","fixed_in":["91.4.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"thunderbird","fixed_in":["91.4.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"thunderbird","fixed_in":["91.4.0-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"thunderbird","fixed_in":["91.4.0-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"firefox-esr","fixed_in":["91.4.0esr-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"firefox-esr","fixed_in":["91.4.0esr-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"firefox-esr","fixed_in":["91.4.0esr-1"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"thunderbird","fixed_in":["1:91.4.0-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"thunderbird","fixed_in":["1:91.4.0-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"thunderbird","fixed_in":["1:91.4.0-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"thunderbird","fixed_in":["1:91.5.0+build1-0ubuntu0.18.04.1"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"thunderbird","fixed_in":["1:91.5.0+build1-0ubuntu0.20.04.1"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.16","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.4.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.17","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.4.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.4.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.4.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.4.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.4.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.4.0-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.4.0-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"firefox-esr","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.4.0esr-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"firefox-esr","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.4.0esr-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"firefox-esr","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.4.0esr-1"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:91.4.0-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:91.4.0-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:91.4.0-1"}]}]},{"source":"osv","ecosystem":"Debian:11","package":"firefox-esr","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.4.1esr-1~deb11u1"}]}],"versions":["78.12.0esr-1","78.13.0esr-1","78.13.0esr-1~deb10u1","78.13.0esr-1~deb11u1","78.13.0esr-1~deb9u1","78.14.0esr-1","78.14.0esr-1~deb10u1","78.14.0esr-1~deb11u1","78.14.0esr-1~deb9u1","78.15.0esr-1~deb10u1","78.15.0esr-1~deb11u1","78.15.0esr-1~deb9u1","91.0.1esr-1","91.0esr-1","91.1.0esr-1","91.2.0esr-1","91.3.0esr-1","91.3.0esr-2","91.4.0esr-1","91.4.1esr-1~deb9u1"],"bundled":18},{"source":"osv","ecosystem":"Debian:10","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:91.4.1-1~deb10u1"}]}],"versions":["1:60.7.2-1","1:60.8.0-1","1:60.8.0-1~deb10u1","1:60.8.0-1~deb8u1","1:60.8.0-1~deb9u1","1:60.8.0-2","1:60.9.0-1","1:60.9.0-1~deb10u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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.","status":"published","published":"2022-12-22T00:00:00Z","modified":"2025-04-16T15:56:28.819Z","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","assessor":"adp"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:33:08.045407Z"}],"euvd":[{"id":"EUVD-2021-34003","description":"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.","status":"published","published":"2022-12-22T00:00:00Z","modified":"2025-04-16T15:56:28Z","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":"2026-11-02T20:52:24.837818Z"}],"ghsa":[{"id":"GHSA-v25r-h4v7-62rr","title":"Mozilla developers and community members Julian Hector, Randell Jesup, Gabriele Svelto, Tyson...","description":"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.","status":"published","published":"2022-12-22T21:30:31Z","modified":"2025-04-16T18:32:39Z","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"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T15:01:35.379285Z"}],"nvd":[{"id":"CVE-2021-4129","description":"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.","status":"published","published":"2022-12-22T20:15:12.133Z","modified":"2026-06-17T04:19:05.15Z","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","assessor":"primary"},{"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","assessor":"secondary"}],"cwes":["CWE-787"],"updated_at":"2026-11-02T14:07:07.323379Z"}],"osv":[{"id":"ALPINE-CVE-2021-4129","description":"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.","status":"published","published":"2022-12-22T20:15:12.133Z","modified":"2026-11-03T06:32:47.837420682Z","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":"2026-11-03T07:16:46.202932Z"},{"id":"CVE-2021-4129","description":"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.","status":"published","published":"2022-12-22T20:15:12.133Z","modified":"2026-04-16T04:44:25.888629715Z","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":"2026-11-02T15:44:21.557945Z"},{"id":"DEBIAN-CVE-2021-4129","description":"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.","status":"published","published":"2022-12-22T20:15:12.133Z","modified":"2026-10-23T18:03:38.891365905Z","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":"2026-11-02T15:45:35.521549Z"},{"id":"RHSA-2021:5013","title":"Red Hat Security Advisory: firefox security update","status":"published","published":"2024-09-16T06:55:58Z","modified":"2025-11-22T12:28:02Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2021:5014","title":"Red Hat Security Advisory: firefox security update","status":"published","published":"2024-09-16T06:56:12Z","modified":"2026-06-26T10:57:07Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2021:5015","title":"Red Hat Security Advisory: firefox security update","status":"published","published":"2024-09-16T06:56:05Z","modified":"2025-11-22T12:28:04Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2021:5016","title":"Red Hat Security Advisory: firefox security update","status":"published","published":"2024-09-16T06:56:20Z","modified":"2025-11-22T12:28:04Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2021:5017","title":"Red Hat Security Advisory: firefox security update","status":"published","published":"2024-09-16T06:56:27Z","modified":"2025-11-22T12:28:05Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2021:5045","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T06:56:42Z","modified":"2025-11-22T12:28:08Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2021:5046","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T06:56:34Z","modified":"2026-06-26T10:57:09Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2021:5047","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T06:56:55Z","modified":"2025-11-22T12:28:09Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2021:5048","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T06:56:48Z","modified":"2025-11-22T12:28:10Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RHSA-2021:5055","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T06:57:02Z","modified":"2025-11-22T12:28:10Z","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":"2026-11-02T15:53:09.077222Z"},{"id":"RLSA-2021:5013","title":"Important: firefox security update","description":"Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.\n\nThis update upgrades Firefox to version 91.4.0 ESR.\n\nSecurity Fix(es):\n\n* Mozilla: Memory safety bugs fixed in Firefox 95 and Firefox ESR 91.4\n\n* Mozilla: URL leakage when navigating while executing asynchronous function (CVE-2021-43536)\n\n* Mozilla: Heap buffer overflow when using structured clone (CVE-2021-43537)\n\n* Mozilla: Missing fullscreen and pointer lock notification when requesting both (CVE-2021-43538)\n\n* Mozilla: GC rooting failure when calling wasm instance methods (CVE-2021-43539)\n\n* Mozilla: External protocol handler parameters were unescaped (CVE-2021-43541)\n\n* Mozilla: XMLHttpRequest error codes could have leaked the existence of an external protocol handler (CVE-2021-43542)\n\n* Mozilla: Bypass of CSP sandbox directive when embedding (CVE-2021-43543)\n\n* Mozilla: Denial of Service when using the Location API in a loop (CVE-2021-43545)\n\n* Mozilla: Cursor spoofing could overlay user interface when native cursor is zoomed (CVE-2021-43546)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2021-12-08T09:42:58Z","modified":"2026-02-04T19:15:12.910579Z","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":"2026-11-02T15:53:23.969672Z"},{"id":"RLSA-2021:5045","title":"Important: thunderbird security update","description":"Mozilla Thunderbird is a standalone mail and newsgroup client.\n\nThis update upgrades Thunderbird to version 91.4.0.\n\nSecurity Fix(es):\n\n* Mozilla: Memory safety bugs fixed in Firefox 95 and Firefox ESR 91.4 (BZ#2030116)\n\n* Mozilla: URL leakage when navigating while executing asynchronous function (CVE-2021-43536)\n\n* Mozilla: Heap buffer overflow when using structured clone (CVE-2021-43537)\n\n* Mozilla: Missing fullscreen and pointer lock notification when requesting both (CVE-2021-43538)\n\n* Mozilla: GC rooting failure when calling wasm instance methods (CVE-2021-43539)\n\n* Mozilla: External protocol handler parameters were unescaped (CVE-2021-43541)\n\n* Mozilla: XMLHttpRequest error codes could have leaked the existence of an external protocol handler (CVE-2021-43542)\n\n* Mozilla: Bypass of CSP sandbox directive when embedding (CVE-2021-43543)\n\n* Mozilla: JavaScript unexpectedly enabled for the composition area (CVE-2021-43528)\n\n* Mozilla: Denial of Service when using the Location API in a loop (CVE-2021-43545)\n\n* Mozilla: Cursor spoofing could overlay user interface when native cursor is zoomed (CVE-2021-43546)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.","status":"published","published":"2021-12-09T12:14:59Z","modified":"2026-02-04T18:30:09.297584Z","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":"2026-11-02T15:53:23.969672Z"},{"id":"UBUNTU-CVE-2021-4129","description":"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.","status":"published","published":"2022-01-21T00:00:00Z","modified":"2026-04-22T13:00:58.3973Z","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"},{"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":"2026-11-02T15:54:29.220315Z"},{"id":"DSA-5026-1","title":"firefox-esr - security update","status":"published","published":"2021-12-19T00:00:00Z","modified":"2026-03-09T02:09:02.23195Z","updated_at":"2026-11-02T15:46:17.543497Z"},{"id":"DSA-5034-1","title":"thunderbird - security update","status":"published","published":"2022-01-02T00:00:00Z","modified":"2026-03-09T02:10:58.437575Z","updated_at":"2026-11-02T15:46:17.543497Z"},{"id":"MGASA-2021-0551","title":"Updated firefox packages fix security vulnerability","description":"Under certain circumstances, asynchronous functions could have caused a\nnavigation to fail but expose the target URL (CVE-2021-43536).\n\nAn incorrect type conversion of sizes from 64bit to 32bit integers allowed an\nattacker to corrupt memory leading to a potentially exploitable crash due to a\nheap buffer overflow when using structured clone (CVE-2021-43537).\n\nBy misusing a race in our notification code, an attacker could have forcefully\nhidden the notification for pages that had received both full screen and\npointer lock access, which could have been used for spoofing attacks\n(CVE-2021-43538).\n\nFailure to correctly record the location of live pointers across wasm instance\ncalls resulted in a GC occurring within the call not tracing those live\npointers. This could have led to a use-after-free causing a potentially\nexploitable crash (CVE-2021-43539).\n\nWhen invoking protocol handlers for external protocols, a supplied parameter \nURL containing spaces was not properly escaped (CVE-2021-43541).             \n\nUsing XMLHttpRequest, an attacker could have identified installed applications\nby probing error messages for loading external protocols (CVE-2021-43542).     \n\nDocuments loaded with the CSP sandbox directive could have escaped the\nsandbox's script restriction by embedding additional content (CVE-2021-43543).\n\nUsing the Location API in a loop could have caused severe application hangs\nand crashes (CVE-2021-43545).\n\nIt was possible to recreate previous cursor spoofing attacks against users\nwith a zoomed native cursor (CVE-2021-43546).\n\nMozilla developers and community members Julian Hector, Randell Jesup,\nGabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported\nmemory safety bugs present in Firefox ESR 91.3. Some of these bugs showed\nevidence of memory corruption and we presume that with enough effort some of\nthese could have been exploited to run arbitrary code (CVE-2021-4129).\n","status":"published","published":"2021-12-10T22:19:07Z","modified":"2026-04-16T04:42:02.942301692Z","updated_at":"2026-11-02T15:49:41.849028Z"},{"id":"MGASA-2021-0554","title":"Updated thunderbird packages fix security vulnerability","description":"Thunderbird unexpectedly enabled JavaScript in the composition area. The\nJavaScript execution context was limited to this area and did not receive\nchrome-level privileges, but could be used as a stepping stone to further an\nattack with other vulnerabilities (CVE-2021-43528).\n\nUnder certain circumstances, asynchronous functions could have caused a\nnavigation to fail but expose the target URL (CVE-2021-43536).\n\nAn incorrect type conversion of sizes from 64bit to 32bit integers allowed an\nattacker to corrupt memory leading to a potentially exploitable crash due to a\nheap buffer overflow when using structured clone (CVE-2021-43537).\n\nBy misusing a race in our notification code, an attacker could have forcefully\nhidden the notification for pages that had received both full screen and\npointer lock access, which could have been used for spoofing attacks\n(CVE-2021-43538).\n                                                                             \nFailure to correctly record the location of live pointers across wasm instance\ncalls resulted in a GC occurring within the call not tracing those live      \npointers. This could have led to a use-after-free causing a potentially      \nexploitable crash (CVE-2021-43539).                                          \n                                                                               \nWhen invoking protocol handlers for external protocols, a supplied parameter\nURL containing spaces was not properly escaped (CVE-2021-43541).\n\nUsing XMLHttpRequest, an attacker could have identified installed applications\nby probing error messages for loading external protocols (CVE-2021-43542).\n\nDocuments loaded with the CSP sandbox directive could have escaped the\nsandbox's script restriction by embedding additional content (CVE-2021-43543).\n\nUsing the Location API in a loop could have caused severe application hangs\nand crashes (CVE-2021-43545).\n\nIt was possible to recreate previous cursor spoofing attacks against users\nwith a zoomed native cursor (CVE-2021-43546).\n\nMozilla developers and community members Julian Hector, Randell Jesup,\nGabriele Svelto, Tyson Smith, Christian Holler, and Masayuki Nakano reported\nmemory safety bugs present in Thunderbird 91.3. Some of these bugs showed\nevidence of memory corruption and we presume that with enough effort some of\nthese could have been exploited to run arbitrary code (CVE-2021-4129).\n","status":"published","published":"2021-12-10T22:19:07Z","modified":"2026-04-16T04:44:10.873947487Z","updated_at":"2026-11-02T15:49:41.849028Z"},{"id":"USN-5248-1","title":"thunderbird vulnerabilities","description":"Multiple security issues were discovered in Thunderbird. If a user were\ntricked into opening a specially crafted website in a browsing context, an\nattacker could potentially exploit these to cause a denial of service,\nobtain sensitive information, trick a user into accepting unwanted\npermissions, conduct header splitting attacks, conduct spoofing attacks,\nbypass security restrictions, confuse the user, or execute arbitrary code.\n(CVE-2021-4129, CVE-2021-4140, CVE-2021-29981, CVE-2021-29982,\nCVE-2021-29987, CVE-2021-29991, CVE-2021-38495, CVE-2021-38496,\nCVE-2021-38497, CVE-2021-38498, CVE-2021-38500, CVE-2021-38501,\nCVE-2021-38503, CVE-2021-38504, CVE-2021-38506, CVE-2021-38507,\nCVE-2021-38508, CVE-2021-38509, CVE-2021-43534, CVE-2021-43535,\nCVE-2021-43536, CVE-2021-43537, CVE-2021-43538, CVE-2021-43539,\nCVE-2021-43541, CVE-2021-43542, CVE-2021-43543, CVE-2021-43545,\nCVE-2021-43656, CVE-2022-22737, CVE-2022-22738, CVE-2022-22739,\nCVE-2022-22740, CVE-2022-22741, CVE-2022-22742, CVE-2022-22743,\nCVE-2022-22745, CVE-2022-22747, CVE-2022-22748, CVE-2022-22751)\n\nIt was discovered that Thunderbird ignored the configuration to require\nSTARTTLS for an SMTP connection. A person-in-the-middle could potentially\nexploit this to perform a downgrade attack in order to intercept messages\nor take control of a session. (CVE-2021-38502)\n\nIt was discovered that JavaScript was unexpectedly enabled in the\ncomposition area. An attacker could potentially exploit this in\ncombination with another vulnerability, with unspecified impacts.\n(CVE-2021-43528)\n\nA buffer overflow was discovered in the Matrix chat library bundled with\nThunderbird. An attacker could potentially exploit this to cause a denial\nof service, or execute arbitrary code. (CVE-2021-44538)\n\nIt was discovered that Thunderbird's OpenPGP integration only considered\nthe inner signed message when checking signature validity in a message\nthat contains an additional outer MIME layer. An attacker could\npotentially exploit this to trick the user into thinking that a message\nhas a valid signature. (CVE-2021-4126)\n","status":"published","published":"2022-01-21T17:00:48Z","modified":"2026-04-27T15:48:44.123941204Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}