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[RHSA-2021:2882-01] Important: thunderbird security update
Posted on 26 July 2021
===================================================================== Red Hat Security Advisory
Synopsis: Important: thunderbird security update
Advisory ID: RHSA-2021:2882-01
Product: Red Hat Enterprise Linux
Advisory URL: https://access.redhat.com/errata/RHSA-2021:2882
Issue date: 2021-07-26
CVE Names: CVE-2021-29969 CVE-2021-29970 CVE-2021-29976
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.
2. Relevant releases/architectures:
Red Hat Enterprise Linux AppStream EUS (v. 8.1) - ppc64le, x86_64
Mozilla Thunderbird is a standalone mail and newsgroup client.
This update upgrades Thunderbird to version 78.12.0.
* Mozilla: IMAP server responses sent by a MITM prior to STARTTLS could be
* Mozilla: Use-after-free in accessibility features of a document
* Mozilla: Memory safety bugs fixed in Firefox 90 and Firefox ESR 78.12
* chromium-browser: Out of bounds write in ANGLE (CVE-2021-30547)
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.
For details on how to apply this update, which includes the changes
described in this advisory, refer to:
All running instances of Thunderbird must be restarted for the update to
5. Bugs fixed (https://bugzilla.redhat.com/):
1970109 - CVE-2021-30547 chromium-browser: Out of bounds write in ANGLE
1982013 - CVE-2021-29970 Mozilla: Use-after-free in accessibility features of a document
1982014 - CVE-2021-29976 Mozilla: Memory safety bugs fixed in Firefox 90 and Firefox ESR 78.12
1982015 - CVE-2021-29969 Mozilla: IMAP server responses sent by a MITM prior to STARTTLS could be processed
6. Package List:
Red Hat Enterprise Linux AppStream EUS (v. 8.1):
These packages are GPG signed by Red Hat for security. Our key and
details on how to verify the signature are available from
The Red Hat security contact is <email@example.com>. More contact
details at https://access.redhat.com/security/team/contact/
Copyright 2021 Red Hat, Inc.