RHSA-2021:2881HighCVSS 8.8

Red Hat Security Advisory: thunderbird security update

Published
July 26, 2021
Last Modified
November 12, 2026

🔗 CVE IDs covered (4)

CVE-2021-29969 →CVE-2021-29970 →CVE-2021-29976 →CVE-2021-30547 →

📋 Description

CVE-2021-29969 — Mozilla: IMAP server responses sent by a MITM prior to STARTTLS could be processed CVE-2021-29970 — Mozilla: Use-after-free in accessibility features of a document CVE-2021-29976 — Mozilla: Memory safety bugs fixed in Firefox 90 and Firefox ESR 78.12 CVE-2021-30547 — chromium-browser: Out of bounds write in ANGLE

🎯 Affected products14

  • Red Hat Enterprise Linux Client (v. 7)
  • Red Hat Enterprise Linux Server Optional (v. 7)
  • Red Hat Enterprise Linux Workstation (v. 7)
  • thunderbird-0:78.12.0-2.el7_9.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7)
  • thunderbird-0:78.12.0-2.el7_9.src as a component of Red Hat Enterprise Linux Client (v. 7)
  • thunderbird-0:78.12.0-2.el7_9.src as a component of Red Hat Enterprise Linux Server Optional (v. 7)
  • thunderbird-0:78.12.0-2.el7_9.src as a component of Red Hat Enterprise Linux Workstation (v. 7)
  • thunderbird-0:78.12.0-2.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7)
  • thunderbird-0:78.12.0-2.el7_9.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)
  • thunderbird-0:78.12.0-2.el7_9.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)
  • thunderbird-debuginfo-0:78.12.0-2.el7_9.ppc64le as a component of Red Hat Enterprise Linux Server Optional (v. 7)
  • thunderbird-debuginfo-0:78.12.0-2.el7_9.x86_64 as a component of Red Hat Enterprise Linux Client (v. 7)
  • thunderbird-debuginfo-0:78.12.0-2.el7_9.x86_64 as a component of Red Hat Enterprise Linux Server Optional (v. 7)
  • thunderbird-debuginfo-0:78.12.0-2.el7_9.x86_64 as a component of Red Hat Enterprise Linux Workstation (v. 7)

✅ 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 (7)