RHSA-2021:0659CriticalCVSS 8.8

Red Hat Security Advisory: firefox security update

Published
February 24, 2021
Last Modified
November 6, 2026

🔗 CVE IDs covered (4)

CVE-2021-23968 →CVE-2021-23969 →CVE-2021-23973 →CVE-2021-23978 →

📋 Description

CVE-2021-23968 — Mozilla: Content Security Policy violation report could have contained the destination of a redirect CVE-2021-23969 — Mozilla: Content Security Policy violation report could have contained the destination of a redirect CVE-2021-23973 — Mozilla: MediaError message property could have leaked information about cross-origin resources CVE-2021-23978 — Mozilla: Memory safety bugs fixed in Firefox 86 and Firefox ESR 78.8

🎯 Affected products14

  • Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-0:78.8.0-1.el8_1.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-0:78.8.0-1.el8_1.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-0:78.8.0-1.el8_1.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-0:78.8.0-1.el8_1.src as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-0:78.8.0-1.el8_1.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-debuginfo-0:78.8.0-1.el8_1.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-debuginfo-0:78.8.0-1.el8_1.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-debuginfo-0:78.8.0-1.el8_1.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-debuginfo-0:78.8.0-1.el8_1.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-debugsource-0:78.8.0-1.el8_1.aarch64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-debugsource-0:78.8.0-1.el8_1.ppc64le as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-debugsource-0:78.8.0-1.el8_1.s390x as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)
  • firefox-debugsource-0:78.8.0-1.el8_1.x86_64 as a component of Red Hat Enterprise Linux AppStream EUS (v. 8.1)

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

🔗 References (7)