Firefox ESR and 1 other: Mozilla developers reported memory safety bugs present in Firefox 89.
CVE-2021-29977 is fixed in 4 products on 2 platforms, first by firefox 90.0+build1-0ubuntu0.18.04.1, released July 14, 2021. It is not reported as exploited. Patch Radar priority: High.
Mozilla developers reported memory safety bugs present in Firefox 89. 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 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 |
| Linux | |||
| 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-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 |
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