{"id":"CVE-2021-29948","aliases":["ALPINE-CVE-2021-29948","DEBIAN-CVE-2021-29948","DLA-2632-1","DSA-4897-1","EUVD-2021-16407","GHSA-7h9q-985f-8xvm","MGASA-2021-0198","RHSA-2021:1350","RHSA-2021:1351","RHSA-2021:1352","RHSA-2021:1353","SUSE-SU-2021:1432-1","UBUNTU-CVE-2021-29948","USN-4995-1","USN-4995-2","openSUSE-SU-2021:0644-1","openSUSE-SU-2024:10601-1"],"status":"published","title":"Signatures are written to disk before and read during verification, which might be subject to a...","description":"Signatures are written to disk before and read during verification, which might be subject to a race condition when a malicious local process or user is replacing the file. This vulnerability affects Thunderbird \u003c 78.10.","severity":{"version":"3.1","score":2.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low","assessor":"primary","from":"nvd"},"epss":{"day":"2026-11-10","score":0.00286,"percentile":0.21348,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-362"],"published":"2021-04-22T00:00:00Z","modified":"2026-11-03T06:32:39Z","fixes":[{"ecosystem":"Alpine:v3.16","package":"thunderbird","fixed_in":["91.3.2-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.17","package":"thunderbird","fixed_in":["91.3.2-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.18","package":"thunderbird","fixed_in":["91.3.2-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.19","package":"thunderbird","fixed_in":["91.3.2-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.20","package":"thunderbird","fixed_in":["91.3.2-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.21","package":"thunderbird","fixed_in":["91.3.2-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.22","package":"thunderbird","fixed_in":["91.3.2-r0"],"sources":["osv"]},{"ecosystem":"Alpine:v3.23","package":"thunderbird","fixed_in":["91.3.2-r0"],"sources":["osv"]},{"ecosystem":"Debian:12","package":"thunderbird","fixed_in":["1:78.10.0-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"thunderbird","fixed_in":["1:78.10.0-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"thunderbird","fixed_in":["1:78.10.0-1"],"sources":["osv"]},{"ecosystem":"Ubuntu:18.04:LTS","package":"thunderbird","fixed_in":["1:78.11.0+build1-0ubuntu0.18.04.2"],"sources":["osv"]},{"ecosystem":"Ubuntu:20.04:LTS","package":"thunderbird","fixed_in":["1:78.11.0+build1-0ubuntu0.20.04.2"],"sources":["osv"]}],"affected":[{"source":"osv","ecosystem":"Alpine:v3.16","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.3.2-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.17","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.3.2-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.18","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.3.2-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.19","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.3.2-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.20","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.3.2-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.21","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.3.2-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.22","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.3.2-r0"}]}]},{"source":"osv","ecosystem":"Alpine:v3.23","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"91.3.2-r0"}]}]},{"source":"osv","ecosystem":"Debian:12","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:78.10.0-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:78.10.0-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:78.10.0-1"}]}]},{"source":"osv","ecosystem":"Debian:9","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:78.10.0-1~deb9u1"}]}],"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","1:60.7.2-1","1:60.7.2-1~deb8u1","1:60.7.2-1~deb9u1","1:60.8.0-1","1:60.8.0-1~deb10u1","1:60.8.0-1~deb8u1","1:60.8.0-1~deb9u1",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This vulnerability affects Thunderbird \u003c 78.10.","status":"published","published":"2021-06-24T14:15:09.86Z","modified":"2026-11-03T06:32:39.180515958Z","cvss":[{"version":"3.1","score":2.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-03T07:17:20.312441Z"},{"id":"CVE-2021-29948","description":"Signatures are written to disk before and read during verification, which might be subject to a race condition when a malicious local process or user is replacing the file. This vulnerability affects Thunderbird \u003c 78.10.","status":"published","published":"2021-06-24T14:15:09.86Z","modified":"2026-04-16T04:35:37.159024199Z","cvss":[{"version":"3.1","score":2.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:44:19.483607Z"},{"id":"DEBIAN-CVE-2021-29948","description":"Signatures are written to disk before and read during verification, which might be subject to a race condition when a malicious local process or user is replacing the file. This vulnerability affects Thunderbird \u003c 78.10.","status":"published","published":"2021-06-24T14:15:09.86Z","modified":"2026-10-23T18:03:12.742440487Z","cvss":[{"version":"3.1","score":2.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:45:34.94143Z"},{"id":"RHSA-2021:1350","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T05:44:09Z","modified":"2026-06-26T10:53:53Z","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":"2026-11-02T15:53:08.071325Z"},{"id":"RHSA-2021:1351","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T05:44:22Z","modified":"2025-11-22T12:19:29Z","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":"2026-11-02T15:53:08.071325Z"},{"id":"RHSA-2021:1352","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T05:44:01Z","modified":"2025-11-22T12:19:30Z","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":"2026-11-02T15:53:08.071325Z"},{"id":"RHSA-2021:1353","title":"Red Hat Security Advisory: thunderbird security update","status":"published","published":"2024-09-16T05:44:15Z","modified":"2025-11-22T12:19:30Z","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":"2026-11-02T15:53:08.071325Z"},{"id":"UBUNTU-CVE-2021-29948","description":"Signatures are written to disk before and read during verification, which might be subject to a race condition when a malicious local process or user is replacing the file. This vulnerability affects Thunderbird \u003c 78.10.","status":"published","published":"2021-04-22T14:54:00Z","modified":"2026-04-22T12:51:44.934618Z","cvss":[{"version":"3.1","score":2.5,"vector":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N","level":"low"}],"updated_at":"2026-11-02T15:54:26.779273Z"},{"id":"DLA-2632-1","title":"thunderbird - security update","status":"published","published":"2021-04-22T00:00:00Z","modified":"2026-03-09T01:23:31.786314Z","updated_at":"2026-11-02T15:46:10.712745Z"},{"id":"DSA-4897-1","title":"thunderbird - security update","status":"published","published":"2021-04-22T00:00:00Z","modified":"2026-03-09T02:11:15.045459Z","updated_at":"2026-11-02T15:46:17.19998Z"},{"id":"MGASA-2021-0198","title":"Updated thunderbird packages fix security vulnerabilities","description":"More internal network hosts could have been probed by a malicious webpage:\nFurther techniques that built on the slipstream research combined with a\nmalicious webpage could have exposed both an internal network's hosts as well\nas services running on the user's local machine (CVE-2021-23961).\n\nOut of bound write due to lazy initialization:\nA WebGL framebuffer was not initialized early enough, resulting in memory\ncorruption and an out of bound write (CVE-2021-23994).\n\nUse-after-free in Responsive Design Mode:\nWhen Responsive Design Mode was enabled, it used references to objects that\nwere previously freed. We presume that with enough effort this could have been\nexploited to run arbitrary code (CVE-2021-23995).\n\nSecure Lock icon could have been spoofed:\nThrough complicated navigations with new windows, an HTTP page could have\ninherited a secure lock icon from an HTTPS page (CVE-2021-23998).\n\nBlob URLs may have been granted additional privileges:\nIf a Blob URL was loaded through some unusual user interaction, it could have\nbeen loaded by the System Principal and granted additional privileges that\nshould not be granted to web content (CVE-2021-23999).\n\nArbitrary FTP command execution on FTP servers using an encoded URL:\nWhen a user clicked on an FTP URL containing encoded newline characters\n(%0A and %0D), the newlines would have been interpreted as such and allowed\narbitrary commands to be sent to the FTP server (CVE-2021-24002).\n\nIncorrect size computation in WebAssembly JIT could lead to null-reads:\nThe WebAssembly JIT could miscalculate the size of a return type, which could\nlead to a null read and result in a crash.\nNote: This issue only affected x86-32 platforms. Other platforms are unaffected.\n(CVE-2021-29945).\n\nPort blocking could be bypassed:\nPorts that were written as an integer overflow above the bounds of a 16-bit\ninteger could have bypassed port blocking restrictions when used in the\nAlt-Svc header (CVE-2021-29946).\n\nRace condition when reading from disk while verifying signatures:\nSignatures are written to disk before and read during verification, which might\nbe subject to a race condition when a malicious local process or user is replacing\nthe file (CVE-2021-29948).\n","status":"published","published":"2021-04-29T09:41:35Z","modified":"2026-04-16T04:41:07.439547001Z","updated_at":"2026-11-02T15:49:41.509337Z"},{"id":"openSUSE-SU-2021:0644-1","title":"Security update for MozillaThunderbird","description":"This update for MozillaThunderbird fixes the following issues:\n\n- Firefox was updated to 78.10.0 ESR (bsc#1184960)\n  * CVE-2021-23994: Out of bound write due to lazy initialization\n  * CVE-2021-23995: Use-after-free in Responsive Design Mode\n  * CVE-2021-23998: Secure Lock icon could have been spoofed\n  * CVE-2021-23961: More internal network hosts could have been probed by a malicious webpage\n  * CVE-2021-23999: Blob URLs may have been granted additional privileges\n  * CVE-2021-24002: Arbitrary FTP command execution on FTP servers using an encoded URL\n  * CVE-2021-29945: Incorrect size computation in WebAssembly JIT could lead to null-reads\n  * CVE-2021-29946: Port blocking could be bypassed\t  \n  * CVE-2021-29948: Race condition when reading from disk while verifying signatures\n\nThis update was imported from the SUSE:SLE-15-SP2:Update update project.","status":"published","published":"2021-05-01T05:02:34Z","modified":"2026-02-04T03:53:15.511352Z","updated_at":"2026-11-02T16:58:31.879684Z"},{"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-2021:1432-1","title":"Security update for MozillaThunderbird","description":"This update for MozillaThunderbird fixes the following issues:\n\n- Firefox was updated to 78.10.0 ESR (bsc#1184960)\n  * CVE-2021-23994: Out of bound write due to lazy initialization\n  * CVE-2021-23995: Use-after-free in Responsive Design Mode\n  * CVE-2021-23998: Secure Lock icon could have been spoofed\n  * CVE-2021-23961: More internal network hosts could have been probed by a malicious webpage\n  * CVE-2021-23999: Blob URLs may have been granted additional privileges\n  * CVE-2021-24002: Arbitrary FTP command execution on FTP servers using an encoded URL\n  * CVE-2021-29945: Incorrect size computation in WebAssembly JIT could lead to null-reads\n  * CVE-2021-29946: Port blocking could be bypassed\t  \n  * CVE-2021-29948: Race condition when reading from disk while verifying signatures\n","status":"published","published":"2021-04-29T08:06:48Z","modified":"2026-02-04T04:35:35.253564Z","updated_at":"2026-11-02T15:53:49.138643Z"},{"id":"USN-4995-1","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, spoof the UI, bypass security restrictions,\nor execute arbitrary code. (CVE-2021-23961, CVE-2021-23981,\nCVE-2021-23982, CVE-2021-23987, CVE-2021-23994, CVE-2021-23998,\nCVE-2021-23999, CVE-2021-29945, CVE-2021-29946, CVE-2021-29967)\n\nIt was discovered that extensions could open popup windows with control\nof the window title in some circumstances. If a user were tricked into\ninstalling a specially crafted extension, an attacker could potentially\nexploit this to spoof a website and trick the user into providing\ncredentials. (CVE-2021-23984)\n\nMultiple security issues were discovered in Thunderbird's OpenPGP\nintegration. If a user were tricked into importing a specially crafted\nkey in some circumstances, an attacker could potentially exploit this\nto cause a denial of service (inability to send encrypted email) or\nconfuse the user. (CVE-2021-23991, CVE-2021-23992, CVE-2021-23993)\n\nA use-after-free was discovered when Responsive Design Mode was\nenabled. If a user were tricked into opening a specially crafted\nwebsite with Responsive Design Mode enabled, an attacker could\npotentially exploit this to cause a denial of service, or execute\narbitrary code. (CVE-2021-23995)\n\nIt was discovered that Thunderbird mishandled ftp URLs with encoded\nnewline characters. If a user were tricked into clicking on a specially\ncrafted link, an attacker could potentially exploit this to send arbitrary\nFTP commands. (CVE-2021-24002)\n\nIt was discovered that Thunderbird wrote signatures to disk and read them\nback during verification. A local attacker could potentially exploit this\nto replace the data with another signature file. (CVE-2021-29948)\n\nIt was discovered that Thunderbird might load an alternative OTR\nlibrary. If a user were tricked into copying a specially crafted\nlibrary to one of Thunderbird's search paths, an attacker could\npotentially exploit this to execute arbitrary code. (CVE-2021-29949)\n\nIt was discovered that secret keys imported into Thunderbird were\nstored unencrypted. A local attacker could potentially exploit this to\nobtain private keys. (CVE-2021-29956)\n\nIt was discovered that Thunderbird did not indicate when an inline signed\nor encrypted message contained additional unprotected parts.\n(CVE-2021-29957)\n","status":"published","published":"2021-06-22T16:43:02Z","modified":"2026-04-22T10:15:28.673707Z","updated_at":"2026-11-02T16:58:15.683829Z"},{"id":"USN-4995-2","title":"thunderbird vulnerabilities","description":"USN-4995-1 fixed vulnerabilities in Thunderbird. This update provides\nthe corresponding updates for Ubuntu 18.04 LTS.\n\nOriginal advisory details:\n\n Multiple security issues were discovered in Thunderbird. If a user were\n tricked into opening a specially crafted website in a browsing context, an\n attacker could potentially exploit these to cause a denial of service,\n obtain sensitive information, spoof the UI, bypass security restrictions,\n or execute arbitrary code. (CVE-2021-23961, CVE-2021-23981,\n CVE-2021-23982, CVE-2021-23987, CVE-2021-23994, CVE-2021-23998,\n CVE-2021-23999, CVE-2021-29945, CVE-2021-29946, CVE-2021-29967)\n \n It was discovered that extensions could open popup windows with control\n of the window title in some circumstances. If a user were tricked into\n installing a specially crafted extension, an attacker could potentially\n exploit this to spoof a website and trick the user into providing\n credentials. (CVE-2021-23984)\n \n Multiple security issues were discovered in Thunderbird's OpenPGP\n integration. If a user were tricked into importing a specially crafted\n key in some circumstances, an attacker could potentially exploit this\n to cause a denial of service (inability to send encrypted email) or\n confuse the user. (CVE-2021-23991, CVE-2021-23992, CVE-2021-23993)\n \n A use-after-free was discovered when Responsive Design Mode was\n enabled. If a user were tricked into opening a specially crafted\n website with Responsive Design Mode enabled, an attacker could\n potentially exploit this to cause a denial of service, or execute\n arbitrary code. (CVE-2021-23995)\n \n It was discovered that Thunderbird mishandled ftp URLs with encoded\n newline characters. If a user were tricked into clicking on a specially\n crafted link, an attacker could potentially exploit this to send arbitrary\n FTP commands. (CVE-2021-24002)\n \n It was discovered that Thunderbird wrote signatures to disk and read them\n back during verification. A local attacker could potentially exploit this\n to replace the data with another signature file. (CVE-2021-29948)\n \n It was discovered that Thunderbird might load an alternative OTR\n library. If a user were tricked into copying a specially crafted\n library to one of Thunderbird's search paths, an attacker could\n potentially exploit this to execute arbitrary code. (CVE-2021-29949)\n \n It was discovered that secret keys imported into Thunderbird were\n stored unencrypted. A local attacker could potentially exploit this to\n obtain private keys. (CVE-2021-29956)\n \n It was discovered that Thunderbird did not indicate when an inline signed\n or encrypted message contained additional unprotected parts.\n (CVE-2021-29957)\n","status":"published","published":"2021-06-25T14:44:38Z","modified":"2026-04-22T10:16:05.579337Z","updated_at":"2026-11-02T16:58:15.683829Z"}]}}