An issue present in lowering/register allocation could have led to obscure but deterministic register confusion failures in JITted code that would lead to a potentially exploitable crash. This vulnerability affects Firefox < 91 and Thunderbird < 91.
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 | alpine-linux-upgrade-firefoxalpine-linux-upgrade-thunderbirdalpine-linux-upgrade-librewolf | Aug 22, 2024 | Aug 17, 2021 | |
| Arch Linux | arch-linux-upgrade-latest | Jul 11, 2025 | Aug 17, 2021 | |
| Gentoo Linux | gentoo-linux-upgrade-www-client-firefoxgentoo-linux-upgrade-www-client-firefox-bin | Feb 22, 2022 | Aug 17, 2021 | |
| Mfsa2021 33 | mozilla-firefox-upgrade-91_0 | Aug 12, 2021 | Aug 10, 2021 | |
| Mozilla Thunderbird | mozilla-thunderbird-upgrade-91_0 | Aug 12, 2021 | Aug 11, 2021 | |
| Oracle Solaris | oracle-solaris-11-4-upgrade-mail-thunderbird-91-3-0-11-4-40-0-1-107-1oracle-solaris-11-4-upgrade-web-browser-firefox-91-3-0-11-4-40-0-1-107-1oracle-solaris-11-4-upgrade-web-data-firefox-bookmarks-91-3-0-11-4-40-0-1-107-1 | Dec 13, 2021 | Aug 17, 2021 | |
| Suse | — | suse-upgrade-mozillafirefoxsuse-upgrade-mozillafirefox-branding-slesuse-upgrade-mozillafirefox-branding-sledsuse-upgrade-mozillafirefox-branding-upstreamsuse-upgrade-mozillafirefox-develsuse-upgrade-mozillafirefox-translations-commonsuse-upgrade-mozillafirefox-translations-othersuse-upgrade-mozillathunderbirdsuse-upgrade-mozillathunderbird-translations-commonsuse-upgrade-mozillathunderbird-translations-othersuse-upgrade-rust-cbindgen | Sep 23, 2021 | Aug 11, 2021 |
| Ubuntu | ubuntu-upgrade-firefoxubuntu-upgrade-thunderbird | Aug 12, 2021 | Aug 11, 2021 |
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