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-2021:3757 - Security Advisory
Issued:
2021-10-11
Updated:
2021-10-11

RHSA-2021:3757 - Security Advisory

  • Overview
  • Updated Packages

Synopsis

Important: firefox 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 firefox 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.

Description

Mozilla Firefox is an open-source web browser, designed for standards compliance, performance, and portability.

This update upgrades Firefox to version 91.2.0 ESR.

Security Fix(es):

  • Mozilla: Use-after-free in MessageTask (CVE-2021-38496)
  • Mozilla: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2 (CVE-2021-38500)
  • Mozilla: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2 (CVE-2021-38501)
  • rust-crossbeam-deque: race condition may lead to double free (CVE-2021-32810)
  • Mozilla: Validation message could have been overlaid on another origin (CVE-2021-38497)
  • Mozilla: Use-after-free of nsLanguageAtomService object (CVE-2021-38498)

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

After installing the update, Firefox must be restarted for the changes to take effect.

Affected Products

  • Red Hat Enterprise Linux for x86_64 - Extended Update Support 8.1 x86_64
  • Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.1 s390x
  • Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.1 ppc64le
  • Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.1 aarch64
  • Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.1 ppc64le
  • Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.1 x86_64

Fixes

  • BZ - 1990342 - CVE-2021-32810 rust-crossbeam-deque: race condition may lead to double free
  • BZ - 2011097 - CVE-2021-38496 Mozilla: Use-after-free in MessageTask
  • BZ - 2011098 - CVE-2021-38497 Mozilla: Validation message could have been overlaid on another origin
  • BZ - 2011099 - CVE-2021-38498 Mozilla: Use-after-free of nsLanguageAtomService object
  • BZ - 2011100 - CVE-2021-38500 Mozilla: Memory safety bugs fixed in Firefox 93, Firefox ESR 78.15, and Firefox ESR 91.2
  • BZ - 2011101 - CVE-2021-38501 Mozilla: Memory safety bugs fixed in Firefox 93 and Firefox ESR 91.2

CVEs

  • CVE-2021-32810
  • CVE-2021-38496
  • CVE-2021-38497
  • CVE-2021-38498
  • CVE-2021-38500
  • CVE-2021-38501

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 8.1

SRPM
firefox-91.2.0-4.el8_1.src.rpm SHA-256: 966c38f47f5823aa2b114c4ee2368ea8597233234475ad26dd4be07846562f55
x86_64
firefox-91.2.0-4.el8_1.x86_64.rpm SHA-256: 6952dfbe7fb40f68aeaeda059fd0f3deb5dd5f2f6d2f5cfee1abafb5f6508669
firefox-debuginfo-91.2.0-4.el8_1.x86_64.rpm SHA-256: 20a4f2c7a8382d08bff3db087fc4e6964734b1db842c86fdf63e1631f013d4e7
firefox-debugsource-91.2.0-4.el8_1.x86_64.rpm SHA-256: 40248f220f825f2c96287aad4085b9ae3f8d901742d94e86fcc5e602c52854ec

Red Hat Enterprise Linux for IBM z Systems - Extended Update Support 8.1

SRPM
firefox-91.2.0-4.el8_1.src.rpm SHA-256: 966c38f47f5823aa2b114c4ee2368ea8597233234475ad26dd4be07846562f55
s390x
firefox-91.2.0-4.el8_1.s390x.rpm SHA-256: 0830fb4a6fd615dc544137b0fcd0fb81e7c8ae09e94b2fbeef483e4dc37ba276
firefox-debuginfo-91.2.0-4.el8_1.s390x.rpm SHA-256: 8b14fbc6d8fccb4047551ea0b51660413abb276b841df71dbd1da305f2911527
firefox-debugsource-91.2.0-4.el8_1.s390x.rpm SHA-256: fe6f4665d78a3ee775e78738f68830eca1b8934ad92fe4305a5d4b010413cc9d

Red Hat Enterprise Linux for Power, little endian - Extended Update Support 8.1

SRPM
firefox-91.2.0-4.el8_1.src.rpm SHA-256: 966c38f47f5823aa2b114c4ee2368ea8597233234475ad26dd4be07846562f55
ppc64le
firefox-91.2.0-4.el8_1.ppc64le.rpm SHA-256: ad6a40954662bd59c37da3c983c0638124cc2df7dc7daf4083780e11609080be
firefox-debuginfo-91.2.0-4.el8_1.ppc64le.rpm SHA-256: cd2bb77bbe8c4fe3d8853e8d73435e30b89612ad1e23b6ad2447db76f24266a5
firefox-debugsource-91.2.0-4.el8_1.ppc64le.rpm SHA-256: 8de3c87b695c01d514ff853f3382822008f1badc1d3f70e74341a94a8e4a33df

Red Hat Enterprise Linux for ARM 64 - Extended Update Support 8.1

SRPM
firefox-91.2.0-4.el8_1.src.rpm SHA-256: 966c38f47f5823aa2b114c4ee2368ea8597233234475ad26dd4be07846562f55
aarch64
firefox-91.2.0-4.el8_1.aarch64.rpm SHA-256: 74a7306392d712c5261ce4c02f36f76485c9428fab812fce7eb21acab979d5d0
firefox-debuginfo-91.2.0-4.el8_1.aarch64.rpm SHA-256: 3a33efdeef0416cc6bf6ff568d709cb0d223341a32d6120df85ca5aa7dd987fd
firefox-debugsource-91.2.0-4.el8_1.aarch64.rpm SHA-256: 694f75ab99e5f31bf0ad6e4f38c3c285bca0130c7822025dfab50ed92629775b

Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions 8.1

SRPM
firefox-91.2.0-4.el8_1.src.rpm SHA-256: 966c38f47f5823aa2b114c4ee2368ea8597233234475ad26dd4be07846562f55
ppc64le
firefox-91.2.0-4.el8_1.ppc64le.rpm SHA-256: ad6a40954662bd59c37da3c983c0638124cc2df7dc7daf4083780e11609080be
firefox-debuginfo-91.2.0-4.el8_1.ppc64le.rpm SHA-256: cd2bb77bbe8c4fe3d8853e8d73435e30b89612ad1e23b6ad2447db76f24266a5
firefox-debugsource-91.2.0-4.el8_1.ppc64le.rpm SHA-256: 8de3c87b695c01d514ff853f3382822008f1badc1d3f70e74341a94a8e4a33df

Red Hat Enterprise Linux for x86_64 - Update Services for SAP Solutions 8.1

SRPM
firefox-91.2.0-4.el8_1.src.rpm SHA-256: 966c38f47f5823aa2b114c4ee2368ea8597233234475ad26dd4be07846562f55
x86_64
firefox-91.2.0-4.el8_1.x86_64.rpm SHA-256: 6952dfbe7fb40f68aeaeda059fd0f3deb5dd5f2f6d2f5cfee1abafb5f6508669
firefox-debuginfo-91.2.0-4.el8_1.x86_64.rpm SHA-256: 20a4f2c7a8382d08bff3db087fc4e6964734b1db842c86fdf63e1631f013d4e7
firefox-debugsource-91.2.0-4.el8_1.x86_64.rpm SHA-256: 40248f220f825f2c96287aad4085b9ae3f8d901742d94e86fcc5e602c52854ec

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

Red Hat LinkedIn YouTube Facebook 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

Red Hat legal and privacy links

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