CVE-2021-38496
Mozilla Firefox ESR and 3 others: During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting…
CVE-2021-38496 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
0.0166
76th percentile
During operations on MessageTasks, a task may have been removed while it was still scheduled, resulting in memory corruption and a potentially exploitable crash. This vulnerability affects Thunderbird < 78.15, Thunderbird < 91.2, Firefox ESR < 91.2, Firefox ESR < 78.15, and Firefox < 93.
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 · Debian 11.6 (bullseye) | 1:91.4.1-1~deb11u1 | DSA-5034-1 | Jan 2, 2022 |
| 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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