Firefox ESR and 3 others: Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird.
CVE-2021-29976 is fixed in 11 products on 2 platforms, first by Mozilla Thunderbird (en-US) 78.12.0, released July 12, 2021. It is not reported as exploited. Patch Radar priority: High.
Mozilla developers reported memory safety bugs present in code shared between Firefox and Thunderbird. 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 Thunderbird < 78.12, Firefox ESR < 78.12, and Firefox < 90.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 91.0 | Mozilla Firefox ESR (en-US) 91.0 | Aug 4, 2021 |
| Mozilla Thunderbird (en-US) | 78.12.0 | Mozilla Thunderbird (en-US) 78.12.0 | Jul 12, 2021 |
| Linux | |||
| firefox · RHEL 8 | 0:78.12.0-1.el8_4 | RHSA-2021:2743 | Jul 15, 2021 |
| firefox · Ubuntu 18.04.6 LTS (bionic) | 90.0+build1-0ubuntu0.18.04.1 | firefox 90.0+build1-0ubuntu0.18.04.1 | Jul 14, 2021 |
| firefox · Ubuntu 20.04 LTS (focal) | 90.0+build1-0ubuntu0.20.04.1 | firefox 90.0+build1-0ubuntu0.20.04.1 | Jul 14, 2021 |
| firefox · ol 8 | 0:78.12.0-1.0.1.el8_4 | ELSA-2021-2743 | Jul 16, 2021 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 90.0+build1-0ubuntu0.18.04.1 | firefox-geckodriver 90.0+build1-0ubuntu0.18.04.1 | Jul 14, 2021 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 90.0+build1-0ubuntu0.20.04.1 | firefox-geckodriver 90.0+build1-0ubuntu0.20.04.1 | Jul 14, 2021 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 90.0+build1-0ubuntu0.18.04.1 | firefox-mozsymbols 90.0+build1-0ubuntu0.18.04.1 | Jul 14, 2021 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 90.0+build1-0ubuntu0.20.04.1 | firefox-mozsymbols 90.0+build1-0ubuntu0.20.04.1 | Jul 14, 2021 |
| thunderbird · RHEL 8 | 0:78.12.0-3.el8_4 | RHSA-2021:2883 | Jul 26, 2021 |
| thunderbird · Ubuntu 18.04.6 LTS (bionic) | 1:78.13.0+build1-0ubuntu0.18.04.1 | thunderbird 1:78.13.0+build1-0ubuntu0.18.04.1 | Aug 10, 2021 |
| thunderbird · Ubuntu 20.04 LTS (focal) | 1:78.13.0+build1-0ubuntu0.20.04.2 | thunderbird 1:78.13.0+build1-0ubuntu0.20.04.2 | Aug 10, 2021 |
| thunderbird · ol 8 | 0:78.12.0-3.0.1.el8_4 | ELSA-2021-2883 | Jul 27, 2021 |
| thunderbird-gnome-support · Ubuntu 18.04.6 LTS (bionic) | 1:78.13.0+build1-0ubuntu0.18.04.1 | thunderbird-gnome-support 1:78.13.0+build1-0ubuntu0.18.04.1 | Aug 10, 2021 |
| thunderbird-gnome-support · Ubuntu 20.04 LTS (focal) | 1:78.13.0+build1-0ubuntu0.20.04.2 | thunderbird-gnome-support 1:78.13.0+build1-0ubuntu0.20.04.2 | Aug 10, 2021 |
| thunderbird-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 1:78.13.0+build1-0ubuntu0.18.04.1 | thunderbird-mozsymbols 1:78.13.0+build1-0ubuntu0.18.04.1 | Aug 10, 2021 |
| thunderbird-mozsymbols · Ubuntu 20.04 LTS (focal) | 1:78.13.0+build1-0ubuntu0.20.04.2 | thunderbird-mozsymbols 1:78.13.0+build1-0ubuntu0.20.04.2 | Aug 10, 2021 |
| xul-ext-calendar-timezones · Ubuntu 18.04.6 LTS (bionic) | 1:78.13.0+build1-0ubuntu0.18.04.1 | xul-ext-calendar-timezones 1:78.13.0+build1-0ubuntu0.18.04.1 | Aug 10, 2021 |
| xul-ext-calendar-timezones · Ubuntu 20.04 LTS (focal) | 1:78.13.0+build1-0ubuntu0.20.04.2 | xul-ext-calendar-timezones 1:78.13.0+build1-0ubuntu0.20.04.2 | Aug 10, 2021 |
| xul-ext-gdata-provider · Ubuntu 18.04.6 LTS (bionic) | 1:78.13.0+build1-0ubuntu0.18.04.1 | xul-ext-gdata-provider 1:78.13.0+build1-0ubuntu0.18.04.1 | Aug 10, 2021 |
| xul-ext-gdata-provider · Ubuntu 20.04 LTS (focal) | 1:78.13.0+build1-0ubuntu0.20.04.2 | xul-ext-gdata-provider 1:78.13.0+build1-0ubuntu0.20.04.2 | Aug 10, 2021 |
| xul-ext-lightning · Ubuntu 18.04.6 LTS (bionic) | 1:78.13.0+build1-0ubuntu0.18.04.1 | xul-ext-lightning 1:78.13.0+build1-0ubuntu0.18.04.1 | Aug 10, 2021 |
| xul-ext-lightning · Ubuntu 20.04 LTS (focal) | 1:78.13.0+build1-0ubuntu0.20.04.2 | xul-ext-lightning 1:78.13.0+build1-0ubuntu0.20.04.2 | Aug 10, 2021 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.