# CVE-2022-22763: Mozilla Firefox ESR and 3 others: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') CVE-2022-22763 is fixed in 10 products on 2 platforms, first by Mozilla Thunderbird (en-US) 91.6.0, released February 8, 2022. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2022-22763 - Priority: High - CVSS: 9.6 (Important) - EPSS: 0.0060 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Feb 8, 2022 - Weakness: CWE-362: Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition') - Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2022-22763 ## Description When a worker is shutdown, it was possible to cause script to run late in the lifecycle, at a point after where it should not be possible. This vulnerability affects Firefox < 96, Thunderbird < 91.6, and Firefox ESR < 91.6. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Windows apps | Mozilla Firefox ESR (en-US) | 102.0 | [Mozilla Firefox ESR (en-US) 102.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox.esr-102.0.md) | Jun 23, 2022 | | Windows apps | Mozilla Thunderbird (en-US) | 91.6.0 | [Mozilla Thunderbird (en-US) 91.6.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-91.6.0.md) | Feb 8, 2022 | | Linux | firefox RHEL 8 | 0:91.6.0-1.el8_5 | [RHSA-2022:0510](https://patchblox.com/security/data/fix/linux/rhsa-2022-0510.md) | Feb 14, 2022 | | Linux | firefox almalinux 8 | 91.6.0-1.el8_5.alma | [ALSA-2022:0510](https://patchblox.com/security/data/fix/linux/alsa-2022-0510.md) | Feb 14, 2022 | | Linux | firefox ol 8 | 0:91.6.0-1.0.1.el8_5 | [ELSA-2022-0510](https://patchblox.com/security/data/fix/linux/elsa-2022-0510.md) | Feb 14, 2022 | | Linux | firefox rocky 8 | 0:91.6.0-1.el8_5 | [RLSA-2022:0510](https://patchblox.com/security/data/fix/linux/rlsa-2022-0510.md) | Feb 14, 2022 | | Linux | firefox-esr Debian 12.15 (bookworm) | 91.6.0esr-1 | [DEBIAN-CVE-2022-22763](https://patchblox.com/security/data/fix/linux/debian-cve-2022-22763.md) | Dec 22, 2022 | | Linux | firefox-esr Debian 13.5 (trixie) | 91.6.0esr-1 | [DEBIAN-CVE-2022-22763](https://patchblox.com/security/data/fix/linux/debian-cve-2022-22763.md) | Dec 22, 2022 | | Linux | firefox-esr Debian 14 | 91.6.0esr-1 | [DEBIAN-CVE-2022-22763](https://patchblox.com/security/data/fix/linux/debian-cve-2022-22763.md) | Dec 22, 2022 | | Linux | thunderbird Debian 12.15 (bookworm) | 1:91.6.0-1 | [DEBIAN-CVE-2022-22763](https://patchblox.com/security/data/fix/linux/debian-cve-2022-22763.md) | Dec 22, 2022 | | Linux | thunderbird Debian 13.5 (trixie) | 1:91.6.0-1 | [DEBIAN-CVE-2022-22763](https://patchblox.com/security/data/fix/linux/debian-cve-2022-22763.md) | Dec 22, 2022 | | Linux | thunderbird Debian 14 | 1:91.6.0-1 | [DEBIAN-CVE-2022-22763](https://patchblox.com/security/data/fix/linux/debian-cve-2022-22763.md) | Dec 22, 2022 | | Linux | thunderbird RHEL 8 | 0:91.6.0-1.el8_5 | [RHSA-2022:0535](https://patchblox.com/security/data/fix/linux/rhsa-2022-0535.md) | Feb 15, 2022 | | Linux | thunderbird Ubuntu 18.04.6 LTS (bionic) | 1:91.7.0+build2-0ubuntu0.18.04.1 | [thunderbird 1:91.7.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-91.7.0-build2-0ubuntu0.18.04.1.md) | Mar 8, 2022 | | Linux | thunderbird Ubuntu 20.04 LTS (focal) | 1:91.7.0+build2-0ubuntu0.20.04.1 | [thunderbird 1:91.7.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-1-91.7.0-build2-0ubuntu0.20.04.1.md) | Mar 8, 2022 | | Linux | thunderbird Ubuntu 22.04.1 LTS (jammy) | 1:91.6.1+build1-0ubuntu1 | [thunderbird 1:91.6.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-1-91.6.1-build1-0ubuntu1.md) | Feb 17, 2022 | | Linux | thunderbird almalinux 8 | 91.6.0-1.el8_5.alma | [ALSA-2022:0535](https://patchblox.com/security/data/fix/linux/alsa-2022-0535.md) | Feb 15, 2022 | | Linux | thunderbird ol 8 | 0:91.6.0-1.0.1.el8_5 | [ELSA-2022-0535](https://patchblox.com/security/data/fix/linux/elsa-2022-0535.md) | Feb 15, 2022 | | Linux | thunderbird rocky 8 | 0:91.6.0-1.el8_5 | [RLSA-2022:0535](https://patchblox.com/security/data/fix/linux/rlsa-2022-0535.md) | Feb 15, 2022 | | Linux | thunderbird-gnome-support Ubuntu 18.04.6 LTS (bionic) | 1:91.7.0+build2-0ubuntu0.18.04.1 | [thunderbird-gnome-support 1:91.7.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-91.7.0-build2-0ubuntu0.18.04.1.md) | Mar 8, 2022 | | Linux | thunderbird-gnome-support Ubuntu 20.04 LTS (focal) | 1:91.7.0+build2-0ubuntu0.20.04.1 | [thunderbird-gnome-support 1:91.7.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-gnome-support-1-91.7.0-build2-0ubuntu0.20.04.1.md) | Mar 8, 2022 | | Linux | thunderbird-gnome-support Ubuntu 22.04.1 LTS (jammy) | 1:91.6.1+build1-0ubuntu1 | [thunderbird-gnome-support 1:91.6.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-gnome-support-1-91.6.1-build1-0ubuntu1.md) | Feb 17, 2022 | | Linux | thunderbird-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 1:91.7.0+build2-0ubuntu0.18.04.1 | [thunderbird-mozsymbols 1:91.7.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-91.7.0-build2-0ubuntu0.18.04.1.md) | Mar 8, 2022 | | Linux | thunderbird-mozsymbols Ubuntu 20.04 LTS (focal) | 1:91.7.0+build2-0ubuntu0.20.04.1 | [thunderbird-mozsymbols 1:91.7.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-mozsymbols-1-91.7.0-build2-0ubuntu0.20.04.1.md) | Mar 8, 2022 | | Linux | thunderbird-mozsymbols Ubuntu 22.04.1 LTS (jammy) | 1:91.6.1+build1-0ubuntu1 | [thunderbird-mozsymbols 1:91.6.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-mozsymbols-1-91.6.1-build1-0ubuntu1.md) | Feb 17, 2022 | | Linux | xul-ext-calendar-timezones Ubuntu 18.04.6 LTS (bionic) | 1:91.7.0+build2-0ubuntu0.18.04.1 | [xul-ext-calendar-timezones 1:91.7.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-91.7.0-build2-0ubuntu0.18.04.1.md) | Mar 8, 2022 | | Linux | xul-ext-calendar-timezones Ubuntu 20.04 LTS (focal) | 1:91.7.0+build2-0ubuntu0.20.04.1 | [xul-ext-calendar-timezones 1:91.7.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-calendar-timezones-1-91.7.0-build2-0ubuntu0.20.04.1.md) | Mar 8, 2022 | | Linux | xul-ext-calendar-timezones Ubuntu 22.04.1 LTS (jammy) | 1:91.6.1+build1-0ubuntu1 | [xul-ext-calendar-timezones 1:91.6.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-calendar-timezones-1-91.6.1-build1-0ubuntu1.md) | Feb 17, 2022 | | Linux | xul-ext-gdata-provider Ubuntu 18.04.6 LTS (bionic) | 1:91.7.0+build2-0ubuntu0.18.04.1 | [xul-ext-gdata-provider 1:91.7.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-91.7.0-build2-0ubuntu0.18.04.1.md) | Mar 8, 2022 | | Linux | xul-ext-gdata-provider Ubuntu 20.04 LTS (focal) | 1:91.7.0+build2-0ubuntu0.20.04.1 | [xul-ext-gdata-provider 1:91.7.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-gdata-provider-1-91.7.0-build2-0ubuntu0.20.04.1.md) | Mar 8, 2022 | | Linux | xul-ext-gdata-provider Ubuntu 22.04.1 LTS (jammy) | 1:91.6.1+build1-0ubuntu1 | [xul-ext-gdata-provider 1:91.6.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-gdata-provider-1-91.6.1-build1-0ubuntu1.md) | Feb 17, 2022 | | Linux | xul-ext-lightning Ubuntu 18.04.6 LTS (bionic) | 1:91.7.0+build2-0ubuntu0.18.04.1 | [xul-ext-lightning 1:91.7.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-91.7.0-build2-0ubuntu0.18.04.1.md) | Mar 8, 2022 | | Linux | xul-ext-lightning Ubuntu 20.04 LTS (focal) | 1:91.7.0+build2-0ubuntu0.20.04.1 | [xul-ext-lightning 1:91.7.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-lightning-1-91.7.0-build2-0ubuntu0.20.04.1.md) | Mar 8, 2022 | | Linux | xul-ext-lightning Ubuntu 22.04.1 LTS (jammy) | 1:91.6.1+build1-0ubuntu1 | [xul-ext-lightning 1:91.6.1+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-lightning-1-91.6.1-build1-0ubuntu1.md) | Feb 17, 2022 | --- Data as of 2026-11-08T19:12:23Z UTC. 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