{"id":"CVE-2021-43529","aliases":["DEBIAN-CVE-2021-43529","DLA-2874-1","DSA-5034-1","EUVD-2021-30458","GHSA-82q7-2fg2-4gcj","RHSA-2021:4130","RHSA-2021:4132","RHSA-2021:4133","RHSA-2021:4134","RLSA-2021:4130","UBUNTU-CVE-2021-43529"],"status":"published","title":"Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021...","description":"Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.","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":0.00469,"percentile":0.41018,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-787"],"published":"2021-11-04T16:03:41Z","modified":"2026-10-23T18:04:16Z","fixes":[{"ecosystem":"Debian:12","package":"thunderbird","fixed_in":["1:91.3.0-1"],"sources":["osv"]},{"ecosystem":"Debian:13","package":"thunderbird","fixed_in":["1:91.3.0-1"],"sources":["osv"]},{"ecosystem":"Debian:14","package":"thunderbird","fixed_in":["1:91.3.0-1"],"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":"Debian:12","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:91.3.0-1"}]}]},{"source":"osv","ecosystem":"Debian:13","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:91.3.0-1"}]}]},{"source":"osv","ecosystem":"Debian:14","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:91.3.0-1"}]}]},{"source":"osv","ecosystem":"Debian:9","package":"thunderbird","ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"1:91.4.1-1~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","1:60.8.0-2","1:60.9.0-1","1:60.9.0-1~deb10u1","1:60.9.0-1~deb8u1","1:60.9.0-1~deb9u1","1:65.0~b1-1","1:66.0~b1-1","1:67.0~b3-1","1:68.0~b1-1","1:68.1.1-1~exp1","1:68.1.2-1~exp1","1:68.10.0-1","1:68.10.0-1~deb10u1","1:68.10.0-1~deb9u1","1:68.11.0-1","1:68.11.0-1~deb10u1","1:68.11.0-1~deb9u1","1:68.11.0-2","1:68.11.0-3","1:68.12.0-1","1:68.12.0-1~deb10u1","1:68.12.0-1~deb9u1","1:68.12.0-1~deb9u2","1:68.2.1-1","1:68.2.2-1","1:68.2.2-1~deb10u1","1:68.2.2-1~deb8u1","1:68.2.2-1~deb9u1","1:68.3.0-1","1:68.3.0-2","1:68.3.0-2~deb10u1","1:68.3.0-2~deb8u1","1:68.3.0-2~deb9u1","1:68.3.1-1","1:68.4.1-1","1:68.4.1-1~deb10u1","1:68.4.1-1~deb8u1","1:68.4.1-1~deb9u1","1:68.4.2-1","1:68.5.0-1","1:68.5.0-1~deb10u1","1:68.5.0-1~deb8u1","1:68.5.0-1~deb9u1","1:68.6.0-1","1:68.6.0-1~deb10u1","1:68.6.0-1~deb8u1","1:68.6.0-1~deb9u1","1:68.7.0-1","1:68.7.0-1~deb10u1","1:68.7.0-1~deb8u1","1:68.7.0-1~deb9u1","1:68.8.0-1","1:68.8.0-1~deb10u1","1:68.8.0-1~deb8u1","1:68.8.0-1~deb9u1","1:68.8.1-1","1:68.9.0-1","1:68.9.0-1~deb10u1","1:68.9.0-1~deb8u1","1:68.9.0-1~deb8u2","1:68.9.0-1~deb9u1","1:76.0~b1-1","1:76.0~b2-1","1:77.0~b1-1","1:77.0~b2-1","1:77.0~b3-1","1:78.0-1","1:78.0.1-1","1:78.0~b1-1","1:78.0~b2-1","1:78.1.0-1","1:78.1.1-1","1:78.10.0-1","1:78.10.0-1~deb10u1","1:78.10.0-1~deb9u1","1:78.10.2-1","1:78.11.0-1","1:78.11.0-1~deb10u1","1:78.11.0-1~deb9u1","1:78.11.0-2","1:78.12.0-1","1:78.12.0-1~deb10u1","1:78.12.0-1~deb9u1","1:78.13.0-1","1:78.13.0-1~deb10u1","1:78.13.0-1~deb11u1","1:78.13.0-1~deb9u1","1:78.14.0-1","1:78.14.0-1~deb10u1","1:78.14.0-1~deb11u1","1:78.14.0-1~deb9u1","1:78.2.0-1","1:78.2.1-1","1:78.2.2-1","1:78.3.1-1","1:78.3.1-2","1:78.3.1-2~deb10u1","1:78.3.1-2~deb10u2","1:78.3.1-2~deb9u1","1:78.3.2-1","1:78.3.3-1","1:78.4.0-1","1:78.4.0-1~deb10u1","1:78.4.0-1~deb9u1","1:78.4.1-1","1:78.4.2-1","1:78.4.2-1~deb10u1","1:78.4.2-1~deb9u1","1:78.5.0-1","1:78.5.0-1~deb10u1","1:78.5.0-1~deb9u1","1:78.5.1-1","1:78.5.1-1~deb10u1","1:78.5.1-1~deb9u1","1:78.6.0-1","1:78.6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Tracking","report"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43529","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-82q7-2fg2-4gcj"},{"url":"https://security-tracker.debian.org/tracker/CVE-2021-43529","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:4130","tags":["advisory"]},{"url":"https://access.redhat.com/security/updates/classification/#important","tags":["article"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2019621","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2019622","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2019624","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2019625","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2019626","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2019627","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2019628","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2019630","tags":["report"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_4130.json","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-38503","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-38503","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38503","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-38504","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-38504","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38504","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-38506","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-38506","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38506","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-38507","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-38507","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38507","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-38508","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-38508","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38508","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-38509","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-38509","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-38509","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-43529","tags":["report"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2088353","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-43529","tags":["advisory","report"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-43527","tags":["article"]},{"url":"https://access.redhat.com/security/vulnerabilities/RHSB-2021-008","tags":["article"]},{"url":"https://bugzilla.mozilla.org/show_bug.cgi?id=1738501","tags":["article"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-43534","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-43534","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43534","tags":["advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2021-43535","tags":["report"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2021-43535","tags":["advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2021-43535","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:4132","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_4132.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:4133","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_4133.json","tags":["advisory"]},{"url":"https://access.redhat.com/errata/RHSA-2021:4134","tags":["advisory"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2021/rhsa-2021_4134.json","tags":["advisory"]},{"url":"https://errata.rockylinux.org/RLSA-2021:4130","tags":["advisory"]},{"url":"https://ubuntu.com/security/CVE-2021-43529","tags":["report"]},{"url":"https://www.openwall.com/lists/oss-security/2021/12/01/6","tags":["report"]}],"sources":{"cve":[{"id":"CVE-2021-43529","description":"Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.","status":"published","published":"2023-02-16T00:00:00Z","modified":"2025-03-19T15:00:31.859Z","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":"2026-11-02T14:32:56.689433Z"}],"euvd":[{"id":"EUVD-2021-30458","description":"Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.","status":"published","published":"2023-02-16T00:00:00Z","modified":"2025-03-19T15:00:31Z","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":"2026-11-02T20:52:59.10334Z"}],"ghsa":[{"id":"GHSA-82q7-2fg2-4gcj","title":"Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021...","description":"Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.","status":"published","published":"2023-02-17T00:30:28Z","modified":"2023-03-08T05:05:55Z","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":"2026-11-02T14:54:17.697698Z"}],"nvd":[{"id":"CVE-2021-43529","description":"Thunderbird versions prior to 91.3.0 are vulnerable to the heap overflow described in CVE-2021-43527 when processing S/MIME messages. 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Thunderbird versions 91.3.0 and later will not call the vulnerable code when processing S/MIME messages that contain certificates with DER-encoded DSA or RSA-PSS signatures.","status":"published","published":"2023-02-16T22:15:00Z","modified":"2026-04-22T13:02:34.197756Z","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":"DLA-2874-1","title":"thunderbird - security update","status":"published","published":"2022-01-04T00:00:00Z","modified":"2026-03-09T01:20:17.063136Z","updated_at":"2026-11-02T15:46:11.189256Z"},{"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"}]}}