When flex-basis was used on a table wrapper, a StyleGenericFlexBasis object could have been incorrectly cast to the wrong type. This resulted in a heap user-after-free, memory corruption, and a potentially exploitable crash. This vulnerability affects Firefox < 84, Thunderbird < 78.6, and Firefox ESR < 78.6.
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 firefox-esrUpgrade thunderbirdUpgrade librewolfUpgrade firefox | Jan 19, 2021 | Jan 7, 2021 |
| Amazon Linux Ami 2 | — | Upgrade thunderbirdUpgrade thunderbird-debuginfo | Jan 8, 2021 | Jan 8, 2021 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jan 7, 2021 |
| Centos_linux | — | Upgrade thunderbird-debugsourceUpgrade thunderbirdUpgrade firefoxUpgrade firefox-debugsourceUpgrade thunderbird-debuginfoUpgrade firefox-debuginfo | Dec 21, 2020 | Dec 16, 2020 |
| Debian | — | Upgrade thunderbirdUpgrade firefox-esr | Dec 18, 2020 | Dec 18, 2020 |
| Gentoo Linux | — | Upgrade www-client/firefox.Upgrade mail-client/thunderbird-bin.Upgrade www-client/firefox-bin.Upgrade mail-client/thunderbird. | Dec 29, 2020 | Dec 23, 2020 |
| Mfsa2020 54 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox version 84.0 | Dec 16, 2020 | Dec 15, 2020 |
| Mfsa2020 55 | — | Upgrade to the latest version of Mozilla FirefoxUpgrade to Mozilla Firefox ESR version 78.6 | Dec 16, 2020 | Dec 15, 2020 |
| Mozilla Thunderbird | — | Upgrade to the latest version of Mozilla ThunderbirdUpgrade to Mozilla Thunderbird version 78.6 | Dec 16, 2020 | Dec 15, 2020 |
| Oracle Solaris | — | Upgrade mail/thunderbird to version 78.6.0-11.4.30.0.1.88.0 on Solaris 11.4 | Feb 17, 2021 | Jan 7, 2021 |
| Oracle_linux | — | Upgrade firefoxUpgrade thunderbird | Dec 17, 2020 | Dec 15, 2020 |
| Redhat_linux | — | Upgrade firefox-debuginfoUpgrade thunderbirdUpgrade firefoxUpgrade thunderbird-debugsourceUpgrade firefox-debugsourceUpgrade thunderbird-debuginfoNo solution exists | Dec 21, 2020 | Dec 16, 2020 |
| Suse | — | Upgrade MozillaThunderbirdUpgrade MozillaFirefoxUpgrade MozillaThunderbird-translations-commonUpgrade mozillafirefox-branding-upstreamUpgrade MozillaFirefox-translations-commonUpgrade MozillaThunderbird-translations-otherUpgrade mozillafirefox-buildsymbolsUpgrade MozillaFirefox-translations-otherUpgrade MozillaFirefox-devel | Dec 22, 2020 | Dec 15, 2020 |
| Ubuntu | — | Upgrade thunderbirdUpgrade firefox | Dec 16, 2020 | Dec 15, 2020 |
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