CVE-2021-38502

mediumPriorität · verfolgen · 24OT-Risiko · erhöhtEPSS 0.011 · 66. PerzentilEUUS

grimoire priorityP3 · Track

Exploitable?

—

no known exploitation

Likely / severe?

1.10% (66th) EPSS

CVSS 4.3 · medium

Is it mine?

16 products

Prüfe deine Angriffsfläche

Who says so?

4 sources

cnnvd · enisa_euvd · nvd · redhat_csaf

EPSS · bewertet 2026-10-28

Thunderbird ignored the configuration to require STARTTLS security for an SMTP connection. A MITM could perform a downgrade attack to intercept transmitted messages, or could take control of the authenticated session to execute SMTP commands chosen by the MITM. If an unprotected authentication method was configured, the MITM could obtain the authentication credentials, too. This vulnerability affects Thunderbird < 91.2.

Behebungen

Hersteller-Fix, Mitigation oder Workaround, wie von den Quellen veröffentlicht.

Ein Hersteller-Fix ist verfügbar.

Behobenthunderbird-0:91.2.0-1.el8_4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-0:91.2.0-1.el8_4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-0:91.2.0-1.el8_4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-0:91.2.0-1.el8_4.src as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-0:91.2.0-1.el8_4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-debuginfo-0:91.2.0-1.el8_4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-debuginfo-0:91.2.0-1.el8_4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-debuginfo-0:91.2.0-1.el8_4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-debuginfo-0:91.2.0-1.el8_4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-debugsource-0:91.2.0-1.el8_4.aarch64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-debugsource-0:91.2.0-1.el8_4.ppc64le as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-debugsource-0:91.2.0-1.el8_4.s390x as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-debugsource-0:91.2.0-1.el8_4.x86_64 as a component of Red Hat Enterprise Linux AppStream (v. 8)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3838
Behobenthunderbird-0:91.2.0-1.el8_2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3839
Behobenthunderbird-0:91.2.0-1.el8_2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3839
Behobenthunderbird-0:91.2.0-1.el8_2.src as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3839
Behobenthunderbird-0:91.2.0-1.el8_2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3839
Behobenthunderbird-debuginfo-0:91.2.0-1.el8_2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3839
Behobenthunderbird-debuginfo-0:91.2.0-1.el8_2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3839
Behobenthunderbird-debuginfo-0:91.2.0-1.el8_2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3839
Behobenthunderbird-debugsource-0:91.2.0-1.el8_2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3839
Behobenthunderbird-debugsource-0:91.2.0-1.el8_2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3839
Behobenthunderbird-debugsource-0:91.2.0-1.el8_2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3839
Behobenthunderbird-0:91.2.0-1.el8_1.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3840
Behobenthunderbird-0:91.2.0-1.el8_1.src as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3840
Behobenthunderbird-0:91.2.0-1.el8_1.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3840
Behobenthunderbird-debuginfo-0:91.2.0-1.el8_1.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3840
Behobenthunderbird-debuginfo-0:91.2.0-1.el8_1.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3840
Behobenthunderbird-debugsource-0:91.2.0-1.el8_1.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3840
Behobenthunderbird-debugsource-0:91.2.0-1.el8_1.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3840
Behobenthunderbird-0:91.2.0-1.el7_9.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3841
Behobenthunderbird-0:91.2.0-1.el7_9.src as a component of Red Hat Enterprise Linux Client (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3841
Behobenthunderbird-0:91.2.0-1.el7_9.src as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3841
Behobenthunderbird-0:91.2.0-1.el7_9.src as a component of Red Hat Enterprise Linux Workstation (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3841
Behobenthunderbird-0:91.2.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3841
Behobenthunderbird-0:91.2.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3841
Behobenthunderbird-0:91.2.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3841
Behobenthunderbird-debuginfo-0:91.2.0-1.el7_9.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3841
Behobenthunderbird-debuginfo-0:91.2.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3841
Behobenthunderbird-debuginfo-0:91.2.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3841
Behobenthunderbird-debuginfo-0:91.2.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)redhat_csaf
For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258 All running instances of Thunderbird must be restarted for the update to take effect.
https://access.redhat.com/errata/RHSA-2021:3841

cvss

Technischer Schweregrad, 0–10. Eine Zeile je Quelle.

7.5

010

Basiswert 0–10 · höher = schwerwiegender · Vektor überfahren zum Auflösen⚠ Quellen uneinig · medium–high · 4.3–7.5

v2.04.3mediumAV:N/AC:M/Au:N/C:P/I:N/A:Nprimary · NVD / NIST USAusnutzbarkeit 8.6 · Auswirkung 2.9

v3.15.9mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:Nprimary · NVD / NIST USAusnutzbarkeit 2.2 · Auswirkung 3.6

v3.07.5highCVSS:3.0/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:Hsecondary · Red Hat Product Security US

v3.15.4mediumCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:Usecondary · CVSS-BT (t0sche)

schwächen

Die CWE-Schwächeklassen, zu denen dies gehört.

CWE-319US

betroffene Produkte (16)

Betroffene Produkte und Versionsbereiche.

Mozilla Thunderbirdunspecified → 91.2enisa_euvdEU
debian debian linux= 10.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
debian debian linux= 11.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
debian debian linux= 9.0nvdUScpe:2.3:o:debian:debian_linux:*:*:*:*:*:*:*:*
mozilla thunderbird< 91.2nvdUScpe:2.3:a:mozilla:thunderbird:*:*:*:*:*:*:*:*
thunderbird-0:91.2.0-1.el7_9.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7)alle Versionenfixedredhat_csafUS
thunderbird-0:91.2.0-1.el7_9.src as a component of Red Hat Enterprise Linux Client (v. 7)alle Versionenfixedredhat_csafUS
thunderbird-0:91.2.0-1.el7_9.src as a component of Red Hat Enterprise Linux Server Optional (v. 7)alle Versionenfixedredhat_csafUS
thunderbird-0:91.2.0-1.el7_9.src as a component of Red Hat Enterprise Linux Workstation (v. 7)alle Versionenfixedredhat_csafUS
thunderbird-0:91.2.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7)alle Versionenfixedredhat_csafUS
thunderbird-0:91.2.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)alle Versionenfixedredhat_csafUS
thunderbird-0:91.2.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)alle Versionenfixedredhat_csafUS
thunderbird-debuginfo-0:91.2.0-1.el7_9.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7)alle Versionenfixedredhat_csafUS
thunderbird-debuginfo-0:91.2.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7)alle Versionenfixedredhat_csafUS
thunderbird-debuginfo-0:91.2.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)alle Versionenfixedredhat_csafUS
thunderbird-debuginfo-0:91.2.0-1.el7_9.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)alle Versionenfixedredhat_csafUS

Advisories (4)

Hersteller- und Ökosystem-Meldungen dazu.

RHSA-2021:3838Red Hat Security Advisory: thunderbird security update2021-10-13csaf · redhat_csafUS
An update for thunderbird is now available for Red Hat Enterprise Linux 8. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
RHSA-2021:3839Red Hat Security Advisory: thunderbird security update2021-10-13csaf · redhat_csafUS
An update for thunderbird is now available for Red Hat Enterprise Linux 8.2 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
RHSA-2021:3840Red Hat Security Advisory: thunderbird security update2021-10-13csaf · redhat_csafUS
An update for thunderbird is now available for Red Hat Enterprise Linux 8.1 Extended Update Support. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.
RHSA-2021:3841Red Hat Security Advisory: thunderbird security update2021-10-13csaf · redhat_csafUS
An update for thunderbird is now available for Red Hat Enterprise Linux 7. Red Hat Product Security has rated this update as having a security impact of Important. A Common Vulnerability Scoring System (CVSS) base score, which gives a detailed severity rating, is available for each vulnerability from the CVE link(s) in the References section.

auch bekannt als (3)

Weitere Namen und Kennungen dieser Entität.

quellen

Welche Quellen diesen Datensatz belegen und wann.

cnnvd enisa_euvd nvd redhat_csaf NVD CVE.org MITRE

veröffentlicht 2021-11-03geändert 2026-06-17

Referenzen (24)

Externe Belege — Patches, Meldungen, Analysen.

scry

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