Firefox ESR and 3 others: Mozilla developers reported memory safety bugs present in Firefox 88 and Firefox ESR 78.11.
CVE-2021-29967 is fixed in 11 products on 2 platforms, first by Mozilla Thunderbird (en-US) 78.11.0, released May 28, 2021. It is not reported as exploited. Patch Radar priority: High.
Mozilla developers reported memory safety bugs present in Firefox 88 and Firefox ESR 78.11. 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 < 78.11, Firefox < 89, and Firefox ESR < 78.11.
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) | 78.11.0 | Mozilla Thunderbird (en-US) 78.11.0 | May 28, 2021 |
| Linux | |||
| firefox · RHEL 8 | 0:78.11.0-3.el8_4 | RHSA-2021:2233 | Jun 3, 2021 |
| firefox · Ubuntu 18.04.6 LTS (bionic) | 89.0+build2-0ubuntu0.18.04.2 | firefox 89.0+build2-0ubuntu0.18.04.2 | Jun 1, 2021 |
| firefox · Ubuntu 20.04 LTS (focal) | 89.0+build2-0ubuntu0.20.04.2 | firefox 89.0+build2-0ubuntu0.20.04.2 | Jun 1, 2021 |
| firefox · ol 8 | 0:78.11.0-3.0.1.el8_4 | ELSA-2021-2233 | Jun 4, 2021 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 89.0+build2-0ubuntu0.18.04.2 | firefox-geckodriver 89.0+build2-0ubuntu0.18.04.2 | Jun 1, 2021 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 89.0+build2-0ubuntu0.20.04.2 | firefox-geckodriver 89.0+build2-0ubuntu0.20.04.2 | Jun 1, 2021 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 89.0+build2-0ubuntu0.18.04.2 | firefox-mozsymbols 89.0+build2-0ubuntu0.18.04.2 | Jun 1, 2021 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 89.0+build2-0ubuntu0.20.04.2 | firefox-mozsymbols 89.0+build2-0ubuntu0.20.04.2 | Jun 1, 2021 |
| thunderbird · RHEL 8 | 0:78.11.0-1.el8_4 | RHSA-2021:2264 | Jun 7, 2021 |
| thunderbird · Ubuntu 18.04.6 LTS (bionic) | 1:78.11.0+build1-0ubuntu0.18.04.2 | thunderbird 1:78.11.0+build1-0ubuntu0.18.04.2 | Jun 1, 2021 |
| thunderbird · Ubuntu 20.04 LTS (focal) | 1:78.11.0+build1-0ubuntu0.20.04.2 | thunderbird 1:78.11.0+build1-0ubuntu0.20.04.2 | Jun 1, 2021 |
| thunderbird · ol 8 | 0:78.11.0-1.0.1.el8_4 | ELSA-2021-2264 | Jun 8, 2021 |
| thunderbird-gnome-support · Ubuntu 18.04.6 LTS (bionic) | 1:78.11.0+build1-0ubuntu0.18.04.2 | thunderbird-gnome-support 1:78.11.0+build1-0ubuntu0.18.04.2 | Jun 1, 2021 |
| thunderbird-gnome-support · Ubuntu 20.04 LTS (focal) | 1:78.11.0+build1-0ubuntu0.20.04.2 | thunderbird-gnome-support 1:78.11.0+build1-0ubuntu0.20.04.2 | Jun 1, 2021 |
| thunderbird-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 1:78.11.0+build1-0ubuntu0.18.04.2 | thunderbird-mozsymbols 1:78.11.0+build1-0ubuntu0.18.04.2 | Jun 1, 2021 |
| thunderbird-mozsymbols · Ubuntu 20.04 LTS (focal) | 1:78.11.0+build1-0ubuntu0.20.04.2 | thunderbird-mozsymbols 1:78.11.0+build1-0ubuntu0.20.04.2 | Jun 1, 2021 |
| xul-ext-calendar-timezones · Ubuntu 18.04.6 LTS (bionic) | 1:78.11.0+build1-0ubuntu0.18.04.2 | xul-ext-calendar-timezones 1:78.11.0+build1-0ubuntu0.18.04.2 | Jun 1, 2021 |
| xul-ext-calendar-timezones · Ubuntu 20.04 LTS (focal) | 1:78.11.0+build1-0ubuntu0.20.04.2 | xul-ext-calendar-timezones 1:78.11.0+build1-0ubuntu0.20.04.2 | Jun 1, 2021 |
| xul-ext-gdata-provider · Ubuntu 18.04.6 LTS (bionic) | 1:78.11.0+build1-0ubuntu0.18.04.2 | xul-ext-gdata-provider 1:78.11.0+build1-0ubuntu0.18.04.2 | Jun 1, 2021 |
| xul-ext-gdata-provider · Ubuntu 20.04 LTS (focal) | 1:78.11.0+build1-0ubuntu0.20.04.2 | xul-ext-gdata-provider 1:78.11.0+build1-0ubuntu0.20.04.2 | Jun 1, 2021 |
| xul-ext-lightning · Ubuntu 18.04.6 LTS (bionic) | 1:78.11.0+build1-0ubuntu0.18.04.2 | xul-ext-lightning 1:78.11.0+build1-0ubuntu0.18.04.2 | Jun 1, 2021 |
| xul-ext-lightning · Ubuntu 20.04 LTS (focal) | 1:78.11.0+build1-0ubuntu0.20.04.2 | xul-ext-lightning 1:78.11.0+build1-0ubuntu0.20.04.2 | Jun 1, 2021 |
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