Incorrect handling of __proto__ mutations may lead to type confusion in IonMonkey JIT code and can be leveraged for arbitrary memory read and write. This vulnerability affects Firefox < 66.0.1, Firefox ESR < 60.6.1, and Thunderbird < 60.6.1.
CVSS Details
- CVSS 3.1 Base Score: 8.8
- CVSS 3.0 Vector: (CVSS:3.0/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 | alpine-linux-upgrade-firefox-esr | Aug 22, 2024 | Apr 26, 2019 | |
| Amazon Linux Ami 2 | amazon-linux-ami-2-upgrade-thunderbirdamazon-linux-ami-2-upgrade-thunderbird-debuginfo | Apr 27, 2020 | Apr 26, 2019 | |
| Arch Linux | arch-linux-upgrade-latest | Jul 11, 2025 | Apr 26, 2019 | |
| Centos_linux | — | centos-upgrade-firefoxcentos-upgrade-firefox-debuginfocentos-upgrade-firefox-debugsourcecentos-upgrade-thunderbirdcentos-upgrade-thunderbird-debuginfocentos-upgrade-thunderbird-debugsource | Apr 3, 2019 | Mar 27, 2019 |
| Debian | debian-upgrade-firefox-esr | Mar 25, 2019 | Mar 25, 2019 | |
| Gentoo Linux | gentoo-linux-upgrade-mail-client-thunderbirdgentoo-linux-upgrade-mail-client-thunderbird-bingentoo-linux-upgrade-www-client-firefoxgentoo-linux-upgrade-www-client-firefox-bin | Apr 3, 2019 | Apr 2, 2019 | |
| Huawei Euleros 2_0_sp2 | huawei-euleros-2_0_sp2-upgrade-firefox | May 30, 2019 | Apr 26, 2019 | |
| Huawei Euleros 2_0_sp3 | huawei-euleros-2_0_sp3-upgrade-firefox | May 30, 2019 | Apr 26, 2019 | |
| Huawei Euleros 2_0_sp9 | huawei-euleros-2_0_sp9-upgrade-mozjs60 | Apr 19, 2022 | Apr 26, 2019 | |
| Mfsa2019 09 | mozilla-firefox-upgrade-66_0_1 | Mar 25, 2019 | Mar 22, 2019 | |
| Mfsa2019 10 | mozilla-firefox-esr-upgrade-60_6_1 | Mar 25, 2019 | Mar 22, 2019 | |
| Mozilla Thunderbird | mozilla-thunderbird-upgrade-60_6_1 | Mar 26, 2019 | Mar 25, 2019 | |
| Oracle Solaris | oracle-solaris-11-4-upgrade-mail-thunderbird-60-6-1-11-4-9-0-1-2-0oracle-solaris-11-4-upgrade-mail-thunderbird-plugin-thunderbird-lightning-60-6-1-11-4-9-0-1-2-0oracle-solaris-11-4-upgrade-web-browser-firefox-60-6-3-11-4-9-0-1-4-0oracle-solaris-11-4-upgrade-web-data-firefox-bookmarks-60-6-3-11-4-9-0-1-4-0 | May 30, 2019 | Apr 26, 2019 | |
| Oracle_linux | — | oracle-linux-upgrade-firefoxoracle-linux-upgrade-thunderbird | Apr 1, 2019 | Mar 22, 2019 |
| Redhat_linux | redhat-upgrade-firefoxredhat-upgrade-firefox-debuginforedhat-upgrade-firefox-debugsourceredhat-upgrade-thunderbirdredhat-upgrade-thunderbird-debuginforedhat-upgrade-thunderbird-debugsource | Mar 28, 2019 | Mar 27, 2019 | |
| Suse | — | suse-upgrade-mozillafirefoxsuse-upgrade-mozillafirefox-branding-upstreamsuse-upgrade-mozillafirefox-buildsymbolssuse-upgrade-mozillafirefox-develsuse-upgrade-mozillafirefox-translations-commonsuse-upgrade-mozillafirefox-translations-othersuse-upgrade-mozillathunderbirdsuse-upgrade-mozillathunderbird-buildsymbolssuse-upgrade-mozillathunderbird-translations-commonsuse-upgrade-mozillathunderbird-translations-other | Apr 1, 2019 | Mar 27, 2019 |
| Ubuntu | ubuntu-upgrade-firefoxubuntu-upgrade-thunderbird | Apr 3, 2019 | Mar 27, 2019 |
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