CVE-2021-38501
Mozilla Firefox ESR and 3 others: Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1.
CVE-2021-38501 is fixed in 11 products on 2 platforms, first by Mozilla Thunderbird (en-US) 91.2.0, released October 4, 2021. It is not reported as exploited. Patch Radar priority: High.
HighFixed on 2 platforms
CVSS
8.8
Important
Exploitation
None reported
No vendor assessment
CISA KEV
Not listed
Not in the Known Exploited Vulnerabilities catalog
EPSS
0.0105
64th percentile
Mozilla developers reported memory safety bugs present in Firefox 92 and Firefox ESR 91.1. 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 < 93, Thunderbird < 91.2, and Firefox ESR < 91.2.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Windows apps | |||
| Mozilla Firefox ESR (en-US) | 102.0 | Mozilla Firefox ESR (en-US) 102.0 | Jun 23, 2022 |
| Mozilla Thunderbird (en-US) | 91.2.0 | Mozilla Thunderbird (en-US) 91.2.0 | Oct 4, 2021 |
| Linux | |||
| firefox · RHEL 8 | 0:91.2.0-4.el8_4 | RHSA-2021:3755 | Oct 11, 2021 |
| firefox · Ubuntu 18.04.6 LTS (bionic) | 93.0+build1-0ubuntu0.18.04.1 | firefox 93.0+build1-0ubuntu0.18.04.1 | Nov 2, 2021 |
| firefox · Ubuntu 20.04 LTS (focal) | 93.0+build1-0ubuntu0.20.04.1 | firefox 93.0+build1-0ubuntu0.20.04.1 | Nov 2, 2021 |
| firefox · ol 8 | 0:91.2.0-4.0.1.el8_4 | ELSA-2021-3755 | Oct 11, 2021 |
| firefox-geckodriver · Ubuntu 18.04.6 LTS (bionic) | 93.0+build1-0ubuntu0.18.04.1 | firefox-geckodriver 93.0+build1-0ubuntu0.18.04.1 | Nov 2, 2021 |
| firefox-geckodriver · Ubuntu 20.04 LTS (focal) | 93.0+build1-0ubuntu0.20.04.1 | firefox-geckodriver 93.0+build1-0ubuntu0.20.04.1 | Nov 2, 2021 |
| firefox-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 93.0+build1-0ubuntu0.18.04.1 | firefox-mozsymbols 93.0+build1-0ubuntu0.18.04.1 | Nov 2, 2021 |
| firefox-mozsymbols · Ubuntu 20.04 LTS (focal) | 93.0+build1-0ubuntu0.20.04.1 | firefox-mozsymbols 93.0+build1-0ubuntu0.20.04.1 | Nov 2, 2021 |
| thunderbird · RHEL 8 | 0:91.2.0-1.el8_4 | RHSA-2021:3838 | Oct 13, 2021 |
| thunderbird · Ubuntu 18.04.6 LTS (bionic) | 1:91.5.0+build1-0ubuntu0.18.04.1 | thunderbird 1:91.5.0+build1-0ubuntu0.18.04.1 | Feb 16, 2023 |
| thunderbird · Ubuntu 20.04 LTS (focal) | 1:91.5.0+build1-0ubuntu0.20.04.1 | thunderbird 1:91.5.0+build1-0ubuntu0.20.04.1 | Feb 16, 2023 |
| thunderbird · Ubuntu 22.04.1 LTS (jammy) | 1:91.3.0+build2-0ubuntu1 | thunderbird 1:91.3.0+build2-0ubuntu1 | Nov 2, 2021 |
| thunderbird · ol 8 | 0:91.2.0-1.0.1.el8_4 | ELSA-2021-3838 | Oct 15, 2021 |
| thunderbird-gnome-support · Ubuntu 18.04.6 LTS (bionic) | 1:91.5.0+build1-0ubuntu0.18.04.1 | thunderbird-gnome-support 1:91.5.0+build1-0ubuntu0.18.04.1 | Feb 16, 2023 |
| thunderbird-gnome-support · Ubuntu 20.04 LTS (focal) | 1:91.5.0+build1-0ubuntu0.20.04.1 | thunderbird-gnome-support 1:91.5.0+build1-0ubuntu0.20.04.1 | Feb 16, 2023 |
| thunderbird-gnome-support · Ubuntu 22.04.1 LTS (jammy) | 1:91.3.0+build2-0ubuntu1 | thunderbird-gnome-support 1:91.3.0+build2-0ubuntu1 | Nov 2, 2021 |
| thunderbird-mozsymbols · Ubuntu 18.04.6 LTS (bionic) | 1:91.5.0+build1-0ubuntu0.18.04.1 | thunderbird-mozsymbols 1:91.5.0+build1-0ubuntu0.18.04.1 | Feb 16, 2023 |
| thunderbird-mozsymbols · Ubuntu 20.04 LTS (focal) | 1:91.5.0+build1-0ubuntu0.20.04.1 | thunderbird-mozsymbols 1:91.5.0+build1-0ubuntu0.20.04.1 | Feb 16, 2023 |
| thunderbird-mozsymbols · Ubuntu 22.04.1 LTS (jammy) | 1:91.3.0+build2-0ubuntu1 | thunderbird-mozsymbols 1:91.3.0+build2-0ubuntu1 | Nov 2, 2021 |
| xul-ext-calendar-timezones · Ubuntu 18.04.6 LTS (bionic) | 1:91.5.0+build1-0ubuntu0.18.04.1 | xul-ext-calendar-timezones 1:91.5.0+build1-0ubuntu0.18.04.1 | Feb 16, 2023 |
| xul-ext-calendar-timezones · Ubuntu 20.04 LTS (focal) | 1:91.5.0+build1-0ubuntu0.20.04.1 | xul-ext-calendar-timezones 1:91.5.0+build1-0ubuntu0.20.04.1 | Feb 16, 2023 |
| xul-ext-calendar-timezones · Ubuntu 22.04.1 LTS (jammy) | 1:91.3.0+build2-0ubuntu1 | xul-ext-calendar-timezones 1:91.3.0+build2-0ubuntu1 | Nov 2, 2021 |
| xul-ext-gdata-provider · Ubuntu 18.04.6 LTS (bionic) | 1:91.5.0+build1-0ubuntu0.18.04.1 | xul-ext-gdata-provider 1:91.5.0+build1-0ubuntu0.18.04.1 | Feb 16, 2023 |
| xul-ext-gdata-provider · Ubuntu 20.04 LTS (focal) | 1:91.5.0+build1-0ubuntu0.20.04.1 | xul-ext-gdata-provider 1:91.5.0+build1-0ubuntu0.20.04.1 | Feb 16, 2023 |
| xul-ext-gdata-provider · Ubuntu 22.04.1 LTS (jammy) | 1:91.3.0+build2-0ubuntu1 | xul-ext-gdata-provider 1:91.3.0+build2-0ubuntu1 | Nov 2, 2021 |
| xul-ext-lightning · Ubuntu 18.04.6 LTS (bionic) | 1:91.5.0+build1-0ubuntu0.18.04.1 | xul-ext-lightning 1:91.5.0+build1-0ubuntu0.18.04.1 | Feb 16, 2023 |
| xul-ext-lightning · Ubuntu 20.04 LTS (focal) | 1:91.5.0+build1-0ubuntu0.20.04.1 | xul-ext-lightning 1:91.5.0+build1-0ubuntu0.20.04.1 | Feb 16, 2023 |
| xul-ext-lightning · Ubuntu 22.04.1 LTS (jammy) | 1:91.3.0+build2-0ubuntu1 | xul-ext-lightning 1:91.3.0+build2-0ubuntu1 | Nov 2, 2021 |
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