The Quarterly Threat Landscape Report is out. See what attackers are targeting now.Read report
When Responsive Design Mode was enabled, it used references to objects that were previously freed. We presume that with enough effort this could have been exploited to run arbitrary code. This vulnerability affects Firefox ESR < 78.10, Thunderbird < 78.10, and Firefox < 88.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade thunderbirdUpgrade firefox | May 4, 2022 | Jun 24, 2021 |
| Alpine Linux | — | Upgrade librewolfUpgrade firefoxUpgrade firefox-esrUpgrade thunderbird | Aug 22, 2024 | Jun 24, 2021 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | May 26, 2021 | May 26, 2021 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jun 24, 2021 |
| Centos_linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade firefox-debuginfoUpgrade firefox-debugsource | Jun 1, 2021 | Apr 26, 2021 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Apr 23, 2021 | Apr 23, 2021 |
| Gentoo Linux | — | Upgrade www-client/firefox.Upgrade mail-client/thunderbird.Upgrade www-client/firefox-bin.Upgrade mail-client/thunderbird-bin. | May 3, 2021 | Apr 30, 2021 |
| Mfsa2021 15 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 78.10 | Apr 20, 2021 | Apr 19, 2021 |
| Mfsa2021 16 | — | Upgrade to Mozilla Firefox version 88.0Upgrade to the latest version of Mozilla Firefox | Apr 20, 2021 | Apr 19, 2021 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 78.10 | Apr 20, 2021 | Apr 19, 2021 |
| Oracle Solaris | — | Upgrade web/data/firefox-bookmarks to version 78.10.0-11.4.34.0.1.94.3 on Solaris 11.4Upgrade mail/thunderbird to version 78.10.0-11.4.34.0.1.94.3 on Solaris 11.4Upgrade web/browser/firefox to version 78.10.0-11.4.34.0.1.94.3 on Solaris 11.4 | Jun 16, 2021 | Jun 16, 2021 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Apr 27, 2021 | Apr 19, 2021 |
| Redhat_linux | — | Upgrade firefox-debuginfoUpgrade thunderbirdUpgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade firefoxNo solution existsUpgrade firefox-debugsource | Apr 27, 2021 | Apr 26, 2021 |
| Suse | — | Upgrade mozillafirefox-buildsymbolsUpgrade mozillafirefox-branding-upstreamUpgrade MozillaThunderbird-translations-commonUpgrade MozillaFirefoxUpgrade MozillaFirefox-translations-otherUpgrade MozillaThunderbird-translations-otherUpgrade MozillaFirefox-translations-commonUpgrade MozillaFirefox-develUpgrade MozillaThunderbird | Apr 27, 2021 | Apr 23, 2021 |
| Ubuntu | — | Upgrade firefoxUpgrade thunderbird | Apr 27, 2021 | Apr 27, 2021 |
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub