RHSA-2021:1201MediumCVSS 7.8

Red Hat Security Advisory: thunderbird security update

Published
April 14, 2021
Last Modified
November 6, 2026

🔗 CVE IDs covered (5)

CVE-2021-23991 →CVE-2021-23992 →CVE-2021-23993 →CVE-2021-29949 →CVE-2021-29950 →

📋 Description

CVE-2021-23991 — Mozilla: An attacker may use Thunderbird's OpenPGP key refresh mechanism to poison an existing key CVE-2021-23992 — Mozilla: A crafted OpenPGP key with an invalid user ID could be used to confuse the user CVE-2021-23993 — Mozilla: Inability to send encrypted OpenPGP email after importing a crafted OpenPGP key CVE-2021-29949 — Mozilla: Thunderbird might execute an alternative OTR library CVE-2021-29950 — Mozilla: Logic issue potentially leaves key material unlocked

🎯 Affected products11

  • Red Hat Enterprise Linux AppStream EUS (v. 8.2)
  • thunderbird-0:78.9.1-1.el8_2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)
  • thunderbird-0:78.9.1-1.el8_2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)
  • thunderbird-0:78.9.1-1.el8_2.src as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)
  • thunderbird-0:78.9.1-1.el8_2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)
  • thunderbird-debuginfo-0:78.9.1-1.el8_2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)
  • thunderbird-debuginfo-0:78.9.1-1.el8_2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)
  • thunderbird-debuginfo-0:78.9.1-1.el8_2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)
  • thunderbird-debugsource-0:78.9.1-1.el8_2.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)
  • thunderbird-debugsource-0:78.9.1-1.el8_2.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)
  • thunderbird-debugsource-0:78.9.1-1.el8_2.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.2)

✅ Remediation

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.

🔗 References (6)