Skip to navigation Skip to main content

Utilities

  • Subscriptions
  • Downloads
  • Red Hat Console
  • Get Support
Red Hat Customer Portal
  • Subscriptions
  • Downloads
  • Red Hat Console
  • Get Support
  • Products

    Top Products

    • Red Hat Enterprise Linux
    • Red Hat OpenShift
    • Red Hat Ansible Automation Platform
    All Products

    Downloads and Containers

    • Downloads
    • Packages
    • Containers

    Top Resources

    • Documentation
    • Product Life Cycles
    • Product Compliance
    • Errata
  • Knowledge

    Red Hat Knowledge Center

    • Knowledgebase Solutions
    • Knowledgebase Articles
    • Customer Portal Labs
    • Errata

    Top Product Docs

    • Red Hat Enterprise Linux
    • Red Hat OpenShift
    • Red Hat Ansible Automation Platform
    All Product Docs

    Training and Certification

    • About
    • Course Index
    • Certification Index
    • Skill Assessment
  • Security

    Red Hat Product Security Center

    • Security Updates
    • Security Advisories
    • Red Hat CVE Database
    • Errata

    References

    • Security Bulletins
    • Security Measurement
    • Severity Ratings
    • Security Data

    Top Resources

    • Security Labs
    • Backporting Policies
    • Security Blog
  • Support

    Red Hat Support

    • Support Cases
    • Troubleshoot
    • Get Support
    • Contact Red Hat Support

    Red Hat Community Support

    • Customer Portal Community
    • Community Discussions
    • Red Hat Accelerator Program

    Top Resources

    • Product Life Cycles
    • Customer Portal Labs
    • Red Hat JBoss Supported Configurations
    • Red Hat Insights
Or troubleshoot an issue.

Select Your Language

  • English
  • Français
  • 한국어
  • 日本語
  • 中文 (中国)

Infrastructure and Management

  • Red Hat Enterprise Linux
  • Red Hat Satellite
  • Red Hat Subscription Management
  • Red Hat Insights
  • Red Hat Ansible Automation Platform

Cloud Computing

  • Red Hat OpenShift
  • Red Hat OpenStack Platform
  • Red Hat OpenShift
  • Red Hat OpenShift AI
  • Red Hat OpenShift Dedicated
  • Red Hat Advanced Cluster Security for Kubernetes
  • Red Hat Advanced Cluster Management for Kubernetes
  • Red Hat Quay
  • Red Hat OpenShift Dev Spaces
  • Red Hat OpenShift Service on AWS

Storage

  • Red Hat Gluster Storage
  • Red Hat Hyperconverged Infrastructure
  • Red Hat Ceph Storage
  • Red Hat OpenShift Data Foundation

Runtimes

  • Red Hat Runtimes
  • Red Hat JBoss Enterprise Application Platform
  • Red Hat Data Grid
  • Red Hat JBoss Web Server
  • Red Hat build of Keycloak
  • Red Hat support for Spring Boot
  • Red Hat build of Node.js
  • Red Hat build of Quarkus

Integration and Automation

  • Red Hat Application Foundations
  • Red Hat Fuse
  • Red Hat AMQ
  • Red Hat 3scale API Management
All Products
Red Hat Product Errata RHSA-2021:5048 - Security Advisory
Issued:
2021-12-09
Updated:
2021-12-09

RHSA-2021:5048 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Important: thunderbird security update

Type/Severity

Security Advisory: Important

Red Hat Insights patch analysis

Identify and remediate systems affected by this advisory.

View affected systems

Topic

An update for thunderbird is now available for Red Hat Enterprise Linux 8.4 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.

Description

Mozilla Thunderbird is a standalone mail and newsgroup client.

This update upgrades Thunderbird to version 91.4.0.

Security Fix(es):

  • Mozilla: Memory safety bugs fixed in Firefox 95 and Firefox ESR 91.4 (BZ#2030116)
  • Mozilla: URL leakage when navigating while executing asynchronous function (CVE-2021-43536)
  • Mozilla: Heap buffer overflow when using structured clone (CVE-2021-43537)
  • Mozilla: Missing fullscreen and pointer lock notification when requesting both (CVE-2021-43538)
  • Mozilla: GC rooting failure when calling wasm instance methods (CVE-2021-43539)
  • Mozilla: External protocol handler parameters were unescaped (CVE-2021-43541)
  • Mozilla: XMLHttpRequest error codes could have leaked the existence of an external protocol handler (CVE-2021-43542)
  • Mozilla: Bypass of CSP sandbox directive when embedding (CVE-2021-43543)
  • Mozilla: JavaScript unexpectedly enabled for the composition area (CVE-2021-43528)
  • Mozilla: Denial of Service when using the Location API in a loop (CVE-2021-43545)
  • Mozilla: Cursor spoofing could overlay user interface when native cursor is zoomed (CVE-2021-43546)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

Solution

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.

Affected Products

  • Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.4 x86_64
  • Red Hat Enterprise Linux Server - AUS 8.4 x86_64
  • Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.4 s390x
  • Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.4 ppc64le
  • Red Hat Enterprise Linux Server - TUS 8.4 x86_64
  • Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.4 aarch64
  • Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.4 ppc64le
  • Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.4 x86_64

Fixes

  • BZ - 2030105 - CVE-2021-43536 Mozilla: URL leakage when navigating while executing asynchronous function
  • BZ - 2030106 - CVE-2021-43537 Mozilla: Heap buffer overflow when using structured clone
  • BZ - 2030109 - CVE-2021-43538 Mozilla: Missing fullscreen and pointer lock notification when requesting both
  • BZ - 2030110 - CVE-2021-43539 Mozilla: GC rooting failure when calling wasm instance methods
  • BZ - 2030111 - CVE-2021-43541 Mozilla: External protocol handler parameters were unescaped
  • BZ - 2030112 - CVE-2021-43542 Mozilla: XMLHttpRequest error codes could have leaked the existence of an external protocol handler
  • BZ - 2030113 - CVE-2021-43543 Mozilla: Bypass of CSP sandbox directive when embedding
  • BZ - 2030114 - CVE-2021-43545 Mozilla: Denial of Service when using the Location API in a loop
  • BZ - 2030115 - CVE-2021-43546 Mozilla: Cursor spoofing could overlay user interface when native cursor is zoomed
  • BZ - 2030116 - Mozilla: Memory safety bugs fixed in Firefox 95 and Firefox ESR 91.4
  • BZ - 2030137 - CVE-2021-43528 Mozilla: JavaScript unexpectedly enabled for the composition area

CVEs

  • CVE-2021-4129
  • CVE-2021-43528
  • CVE-2021-43536
  • CVE-2021-43537
  • CVE-2021-43538
  • CVE-2021-43539
  • CVE-2021-43541
  • CVE-2021-43542
  • CVE-2021-43543
  • CVE-2021-43545
  • CVE-2021-43546

References

  • https://access.redhat.com/security/updates/classification/#important
Note: More recent versions of these packages may be available. Click a package name for more details.

Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.4

SRPM
thunderbird-91.4.0-2.el8_4.src.rpm SHA-256: 90cff5b2a3b1ee433a451a544e010d5123e6ca4cfd2b426ec642662dfca02592
x86_64
thunderbird-91.4.0-2.el8_4.x86_64.rpm SHA-256: 437ce6e1980406f8ac2fd9272da71f6b37e7b39f336365f729bf02ce4683742b
thunderbird-debuginfo-91.4.0-2.el8_4.x86_64.rpm SHA-256: f610c58ed6f711e3f4e5fe30acf7138d80d4b5b753dcc1c09908220af2af3dfd
thunderbird-debugsource-91.4.0-2.el8_4.x86_64.rpm SHA-256: 11650cf058badf718349bb84c2d3ba8cc67891752120bc43baaa4dab7a0c0b9a

Red Hat Enterprise Linux Server - AUS 8.4

SRPM
thunderbird-91.4.0-2.el8_4.src.rpm SHA-256: 90cff5b2a3b1ee433a451a544e010d5123e6ca4cfd2b426ec642662dfca02592
x86_64
thunderbird-91.4.0-2.el8_4.x86_64.rpm SHA-256: 437ce6e1980406f8ac2fd9272da71f6b37e7b39f336365f729bf02ce4683742b
thunderbird-debuginfo-91.4.0-2.el8_4.x86_64.rpm SHA-256: f610c58ed6f711e3f4e5fe30acf7138d80d4b5b753dcc1c09908220af2af3dfd
thunderbird-debugsource-91.4.0-2.el8_4.x86_64.rpm SHA-256: 11650cf058badf718349bb84c2d3ba8cc67891752120bc43baaa4dab7a0c0b9a

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.4

SRPM
thunderbird-91.4.0-2.el8_4.src.rpm SHA-256: 90cff5b2a3b1ee433a451a544e010d5123e6ca4cfd2b426ec642662dfca02592
s390x
thunderbird-91.4.0-2.el8_4.s390x.rpm SHA-256: 18b9802898c5d867dd73e0533499136d7d0807c69f77127ef8e702e91746fc4b
thunderbird-debuginfo-91.4.0-2.el8_4.s390x.rpm SHA-256: 0263d6250ee81d4d63ba6d71e314fc1ee00d7d117cb73d1179e7c7add7df5377
thunderbird-debugsource-91.4.0-2.el8_4.s390x.rpm SHA-256: 548a2089fc87e4bfc7766cf4c84d9a4ec664a877cb16cb1368a2a1ad9aa2c12a

Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.4

SRPM
thunderbird-91.4.0-2.el8_4.src.rpm SHA-256: 90cff5b2a3b1ee433a451a544e010d5123e6ca4cfd2b426ec642662dfca02592
ppc64le
thunderbird-91.4.0-2.el8_4.ppc64le.rpm SHA-256: d08faa1f09f778b753997d161cee553bc0b9a8a3387ebf2f296789666c83e53f
thunderbird-debuginfo-91.4.0-2.el8_4.ppc64le.rpm SHA-256: c543931f89f5ab87d33fbae71a496a0e7efe7f1608ad363ffed97bfe2510f868
thunderbird-debugsource-91.4.0-2.el8_4.ppc64le.rpm SHA-256: 5e66f7286dea174228d36657d5a1bae4d6a4f7db9d9ad8e179d997400cb1a4fe

Red Hat Enterprise Linux Server - TUS 8.4

SRPM
thunderbird-91.4.0-2.el8_4.src.rpm SHA-256: 90cff5b2a3b1ee433a451a544e010d5123e6ca4cfd2b426ec642662dfca02592
x86_64
thunderbird-91.4.0-2.el8_4.x86_64.rpm SHA-256: 437ce6e1980406f8ac2fd9272da71f6b37e7b39f336365f729bf02ce4683742b
thunderbird-debuginfo-91.4.0-2.el8_4.x86_64.rpm SHA-256: f610c58ed6f711e3f4e5fe30acf7138d80d4b5b753dcc1c09908220af2af3dfd
thunderbird-debugsource-91.4.0-2.el8_4.x86_64.rpm SHA-256: 11650cf058badf718349bb84c2d3ba8cc67891752120bc43baaa4dab7a0c0b9a

Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.4

SRPM
thunderbird-91.4.0-2.el8_4.src.rpm SHA-256: 90cff5b2a3b1ee433a451a544e010d5123e6ca4cfd2b426ec642662dfca02592
aarch64
thunderbird-91.4.0-2.el8_4.aarch64.rpm SHA-256: 56c24c50e769b38e619f329f6552f814da6977b54f9e3599e97eeb43d8ad4d9b
thunderbird-debuginfo-91.4.0-2.el8_4.aarch64.rpm SHA-256: 37c693bf6a733307685cb76658c6cff460fcef0634293d2536ed205c12a270ea
thunderbird-debugsource-91.4.0-2.el8_4.aarch64.rpm SHA-256: b726e337400b4c6e25d385c4f8a1a9a7db98a535a6d76e51fc4fb8ec18a76c72

Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.4

SRPM
thunderbird-91.4.0-2.el8_4.src.rpm SHA-256: 90cff5b2a3b1ee433a451a544e010d5123e6ca4cfd2b426ec642662dfca02592
ppc64le
thunderbird-91.4.0-2.el8_4.ppc64le.rpm SHA-256: d08faa1f09f778b753997d161cee553bc0b9a8a3387ebf2f296789666c83e53f
thunderbird-debuginfo-91.4.0-2.el8_4.ppc64le.rpm SHA-256: c543931f89f5ab87d33fbae71a496a0e7efe7f1608ad363ffed97bfe2510f868
thunderbird-debugsource-91.4.0-2.el8_4.ppc64le.rpm SHA-256: 5e66f7286dea174228d36657d5a1bae4d6a4f7db9d9ad8e179d997400cb1a4fe

Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.4

SRPM
thunderbird-91.4.0-2.el8_4.src.rpm SHA-256: 90cff5b2a3b1ee433a451a544e010d5123e6ca4cfd2b426ec642662dfca02592
x86_64
thunderbird-91.4.0-2.el8_4.x86_64.rpm SHA-256: 437ce6e1980406f8ac2fd9272da71f6b37e7b39f336365f729bf02ce4683742b
thunderbird-debuginfo-91.4.0-2.el8_4.x86_64.rpm SHA-256: f610c58ed6f711e3f4e5fe30acf7138d80d4b5b753dcc1c09908220af2af3dfd
thunderbird-debugsource-91.4.0-2.el8_4.x86_64.rpm SHA-256: 11650cf058badf718349bb84c2d3ba8cc67891752120bc43baaa4dab7a0c0b9a

The Red Hat security contact is secalert@redhat.com. More contact details at https://access.redhat.com/security/team/contact/.

Red Hat X (formerly Twitter)

Quick Links

  • Downloads
  • Subscriptions
  • Support Cases
  • Customer Service
  • Product Documentation

Help

  • Contact Us
  • Customer Portal FAQ
  • Log-in Assistance

Site Info

  • Trust Red Hat
  • Browser Support Policy
  • Accessibility
  • Awards and Recognition
  • Colophon

Related Sites

  • redhat.com
  • developers.redhat.com
  • connect.redhat.com
  • cloud.redhat.com

Red Hat legal and privacy links

  • About Red Hat
  • Jobs
  • Events
  • Locations
  • Contact Red Hat
  • Red Hat Blog
  • Inclusion at Red Hat
  • Cool Stuff Store
  • Red Hat Summit
© 2025 Red Hat, Inc.

Red Hat legal and privacy links

  • Privacy statement
  • Terms of use
  • All policies and guidelines
  • Digital accessibility