Mozilla developers reported memory safety bugs present in Firefox 84 and Firefox ESR 78.6. Some of these bugs showed evidence of memory corruption and we presume that with enough effort some of these could have been exploited to run arbitrary code. This vulnerability affects Firefox < 85, Thunderbird < 78.7, and Firefox ESR < 78.7.
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alpine Linux | — | Upgrade thunderbirdUpgrade firefoxUpgrade firefox-esrUpgrade librewolfUpgrade mozjs78 | Jun 17, 2022 | Feb 26, 2021 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | Feb 22, 2021 | Feb 22, 2021 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Feb 26, 2021 |
| Centos_linux | — | Upgrade thunderbird-debuginfoUpgrade thunderbird-debugsourceUpgrade firefox-debugsourceUpgrade thunderbirdUpgrade firefoxUpgrade firefox-debuginfo | Jan 28, 2021 | Jan 27, 2021 |
| Debian | — | Upgrade firefox-esrUpgrade thunderbird | Jan 29, 2021 | Jan 29, 2021 |
| Gentoo Linux | — | Upgrade www-client/firefox-bin.Upgrade mail-client/thunderbird.Upgrade www-client/firefox.Upgrade mail-client/thunderbird-bin. | Feb 1, 2021 | Feb 1, 2021 |
| Mfsa2021 03 | — | Upgrade to Mozilla Firefox version 85.0 | Jan 27, 2021 | Jan 26, 2021 |
| Mfsa2021 04 | — | Upgrade to Mozilla Firefox ESR version 78.7 | Jan 27, 2021 | Jan 26, 2021 |
| Mozilla Thunderbird | — | Upgrade to Mozilla Thunderbird version 78.7 | Jan 27, 2021 | Jan 26, 2021 |
| Oracle Solaris | — | Upgrade mail/thunderbird to version 78.8.0-11.4.31.0.1.88.4 on Solaris 11.4Upgrade library/libmozjs-78 to version 78.11.0-11.4.39.0.1.107.0 on Solaris 11.4Upgrade web/browser/firefox to version 78.8.0-11.4.31.0.1.88.4 on Solaris 11.4Upgrade web/data/firefox-bookmarks to version 78.8.0-11.4.31.0.1.88.4 on Solaris 11.4 | Mar 17, 2021 | Feb 26, 2021 |
| Oracle_linux | — | Upgrade thunderbirdUpgrade firefox | Jan 28, 2021 | Jan 26, 2021 |
| Redhat_linux | — | Upgrade firefox-debugsourceUpgrade thunderbird-debugsourceUpgrade firefoxUpgrade thunderbird-debuginfoNo solution existsUpgrade firefox-debuginfoUpgrade thunderbird | Jan 28, 2021 | Jan 27, 2021 |
| Suse | — | Upgrade mozillafirefox-develUpgrade mozillathunderbird-translations-otherUpgrade mozillafirefox-translations-commonUpgrade mozillathunderbird-translations-commonUpgrade mozillafirefox-translations-otherUpgrade mozillafirefoxUpgrade mozillathunderbirdUpgrade mozillafirefox-buildsymbolsUpgrade mozillafirefox-branding-upstream | Jan 30, 2021 | Jan 27, 2021 |
| Ubuntu | — | Upgrade thunderbirdUpgrade firefox | Feb 2, 2021 | Jan 27, 2021 |
Prioritise with Active Threat Intelligence
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