RHSA-2021:0656 — Security Advisory
Red Hat Security Advisory: firefox security update
Severity
CriticalRed Hat Product Security
Products
Official CSAF product identity
Published · February 25, 2021
Updated · June 25, 2026
Topic
An update for firefox is now available for Red Hat Enterprise Linux 7.
Red Hat Product Security has rated this update as having a security impact of Critical. 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 78.8.0 ESR.
Security Fix(es):
-
Mozilla: Content Security Policy violation report could have contained the destination of a redirect (CVE-2021-23968)
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Mozilla: Content Security Policy violation report could have contained the destination of a redirect (CVE-2021-23969)
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Mozilla: Memory safety bugs fixed in Firefox 86 and Firefox ESR 78.8 (CVE-2021-23978)
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Mozilla: MediaError message property could have leaked information about cross-origin resources (CVE-2021-23973)
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.