# CVE-2022-22751: Mozilla Firefox ESR and 3 others: Out-of-bounds Write

CVE-2022-22751 is fixed in 12 products on 2 platforms, first by Mozilla Thunderbird (en-US) 91.5.0, released January 6, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-22751
- Priority: High
- CVSS: 9.6 (Important)
- EPSS: 0.0092
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jan 12, 2022
- Weakness: CWE-787: Out-of-bounds Write
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2022-22751

## Description

Mozilla developers Calixte Denizet, Kershaw Chang, Christian Holler, Jason Kratzer, Gabriele Svelto, Tyson Smith, Simon Giesecke, and Steve Fink reported memory safety bugs present in Firefox 95 and Firefox ESR 91.4. 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 ESR < 91.5, Firefox < 96, and Thunderbird < 91.5.

## 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) | 91.5.0 | [Mozilla Thunderbird (en-US) 91.5.0](https://patchblox.com/security/data/fix/windows-app/mozilla.thunderbird-91.5.0.md) | Jan 6, 2022 |
| Linux | firefox RHEL 8 | 0:91.5.0-1.el8_5 | [RHSA-2022:0130](https://patchblox.com/security/data/fix/linux/rhsa-2022-0130.md) | Jan 12, 2022 |
| Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 96.0+build2-0ubuntu0.18.04.1 | [firefox 96.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-96.0-build2-0ubuntu0.18.04.1.md) | Jan 12, 2022 |
| Linux | firefox Ubuntu 20.04 LTS (focal) | 96.0+build2-0ubuntu0.20.04.1 | [firefox 96.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-96.0-build2-0ubuntu0.20.04.1.md) | Jan 12, 2022 |
| Linux | firefox Ubuntu 22.04.1 LTS (jammy) | 96.0+build2-0ubuntu1 | [firefox 96.0+build2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-firefox-96.0-build2-0ubuntu1.md) | Jan 12, 2022 |
| Linux | firefox almalinux 8 | 91.5.0-1.el8_5.alma | [ALSA-2022:0130](https://patchblox.com/security/data/fix/linux/alsa-2022-0130.md) | Jan 12, 2022 |
| Linux | firefox ol 8 | 0:91.5.0-1.0.1.el8_5 | [ELSA-2022-0130](https://patchblox.com/security/data/fix/linux/elsa-2022-0130.md) | Jan 13, 2022 |
| Linux | firefox rocky 8 | 0:91.5.0-1.el8_5 | [RLSA-2022:0130](https://patchblox.com/security/data/fix/linux/rlsa-2022-0130.md) | Jan 12, 2022 |
| Linux | firefox-esr Debian 12.15 (bookworm) | 91.5.0esr-1 | [DEBIAN-CVE-2022-22751](https://patchblox.com/security/data/fix/linux/debian-cve-2022-22751.md) | Dec 22, 2022 |
| Linux | firefox-esr Debian 13.5 (trixie) | 91.5.0esr-1 | [DEBIAN-CVE-2022-22751](https://patchblox.com/security/data/fix/linux/debian-cve-2022-22751.md) | Dec 22, 2022 |
| Linux | firefox-esr Debian 14 | 91.5.0esr-1 | [DEBIAN-CVE-2022-22751](https://patchblox.com/security/data/fix/linux/debian-cve-2022-22751.md) | Dec 22, 2022 |
| Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 96.0+build2-0ubuntu0.18.04.1 | [firefox-geckodriver 96.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-96.0-build2-0ubuntu0.18.04.1.md) | Jan 12, 2022 |
| Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 96.0+build2-0ubuntu0.20.04.1 | [firefox-geckodriver 96.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-96.0-build2-0ubuntu0.20.04.1.md) | Jan 12, 2022 |
| Linux | firefox-geckodriver Ubuntu 22.04.1 LTS (jammy) | 96.0+build2-0ubuntu1 | [firefox-geckodriver 96.0+build2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-firefox-geckodriver-96.0-build2-0ubuntu1.md) | Jan 12, 2022 |
| Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 96.0+build2-0ubuntu0.18.04.1 | [firefox-mozsymbols 96.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-96.0-build2-0ubuntu0.18.04.1.md) | Jan 12, 2022 |
| Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 96.0+build2-0ubuntu0.20.04.1 | [firefox-mozsymbols 96.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-96.0-build2-0ubuntu0.20.04.1.md) | Jan 12, 2022 |
| Linux | firefox-mozsymbols Ubuntu 22.04.1 LTS (jammy) | 96.0+build2-0ubuntu1 | [firefox-mozsymbols 96.0+build2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-firefox-mozsymbols-96.0-build2-0ubuntu1.md) | Jan 12, 2022 |
| Linux | thunderbird Debian 12.15 (bookworm) | 1:91.5.0-1 | [DEBIAN-CVE-2022-22751](https://patchblox.com/security/data/fix/linux/debian-cve-2022-22751.md) | Dec 22, 2022 |
| Linux | thunderbird Debian 13.5 (trixie) | 1:91.5.0-1 | [DEBIAN-CVE-2022-22751](https://patchblox.com/security/data/fix/linux/debian-cve-2022-22751.md) | Dec 22, 2022 |
| Linux | thunderbird Debian 14 | 1:91.5.0-1 | [DEBIAN-CVE-2022-22751](https://patchblox.com/security/data/fix/linux/debian-cve-2022-22751.md) | Dec 22, 2022 |
| Linux | thunderbird RHEL 8 | 0:91.5.0-1.el8_5 | [RHSA-2022:0129](https://patchblox.com/security/data/fix/linux/rhsa-2022-0129.md) | Jan 12, 2022 |
| Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-1-91.5.0-build1-0ubuntu0.18.04.1.md) | Feb 16, 2023 |
| Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-1-91.5.0-build1-0ubuntu0.20.04.1.md) | Feb 16, 2023 |
| Linux | thunderbird Ubuntu 22.04.1 LTS (jammy) | 1:91.5.0+build1-0ubuntu1 | [thunderbird 1:91.5.0+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-1-91.5.0-build1-0ubuntu1.md) | Jan 12, 2022 |
| Linux | thunderbird almalinux 8 | 91.5.0-1.el8_5.alma.plus | [ALSA-2022:0129](https://patchblox.com/security/data/fix/linux/alsa-2022-0129.md) | Jan 12, 2022 |
| Linux | thunderbird ol 8 | 0:91.5.0-1.0.1.el8_5 | [ELSA-2022-0129](https://patchblox.com/security/data/fix/linux/elsa-2022-0129.md) | Jan 13, 2022 |
| Linux | thunderbird rocky 8 | 0:91.5.0-1.el8_5 | [RLSA-2022:0129](https://patchblox.com/security/data/fix/linux/rlsa-2022-0129.md) | Jan 12, 2022 |
| Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-gnome-support-1-91.5.0-build1-0ubuntu0.18.04.1.md) | Feb 16, 2023 |
| Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-gnome-support-1-91.5.0-build1-0ubuntu0.20.04.1.md) | Feb 16, 2023 |
| Linux | thunderbird-gnome-support Ubuntu 22.04.1 LTS (jammy) | 1:91.5.0+build1-0ubuntu1 | [thunderbird-gnome-support 1:91.5.0+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-gnome-support-1-91.5.0-build1-0ubuntu1.md) | Jan 12, 2022 |
| Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-thunderbird-mozsymbols-1-91.5.0-build1-0ubuntu0.18.04.1.md) | Feb 16, 2023 |
| Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-thunderbird-mozsymbols-1-91.5.0-build1-0ubuntu0.20.04.1.md) | Feb 16, 2023 |
| Linux | thunderbird-mozsymbols Ubuntu 22.04.1 LTS (jammy) | 1:91.5.0+build1-0ubuntu1 | [thunderbird-mozsymbols 1:91.5.0+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-thunderbird-mozsymbols-1-91.5.0-build1-0ubuntu1.md) | Jan 12, 2022 |
| Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-calendar-timezones-1-91.5.0-build1-0ubuntu0.18.04.1.md) | Feb 16, 2023 |
| Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-calendar-timezones-1-91.5.0-build1-0ubuntu0.20.04.1.md) | Feb 16, 2023 |
| Linux | xul-ext-calendar-timezones Ubuntu 22.04.1 LTS (jammy) | 1:91.5.0+build1-0ubuntu1 | [xul-ext-calendar-timezones 1:91.5.0+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-calendar-timezones-1-91.5.0-build1-0ubuntu1.md) | Jan 12, 2022 |
| Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-gdata-provider-1-91.5.0-build1-0ubuntu0.18.04.1.md) | Feb 16, 2023 |
| Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-gdata-provider-1-91.5.0-build1-0ubuntu0.20.04.1.md) | Feb 16, 2023 |
| Linux | xul-ext-gdata-provider Ubuntu 22.04.1 LTS (jammy) | 1:91.5.0+build1-0ubuntu1 | [xul-ext-gdata-provider 1:91.5.0+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-gdata-provider-1-91.5.0-build1-0ubuntu1.md) | Jan 12, 2022 |
| Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-xul-ext-lightning-1-91.5.0-build1-0ubuntu0.18.04.1.md) | Feb 16, 2023 |
| Linux | 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](https://patchblox.com/security/data/fix/linux/ubuntu-focal-xul-ext-lightning-1-91.5.0-build1-0ubuntu0.20.04.1.md) | Feb 16, 2023 |
| Linux | xul-ext-lightning Ubuntu 22.04.1 LTS (jammy) | 1:91.5.0+build1-0ubuntu1 | [xul-ext-lightning 1:91.5.0+build1-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-xul-ext-lightning-1-91.5.0-build1-0ubuntu1.md) | Jan 12, 2022 |

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