# CVE-2022-0511: Mozilla Firefox ESR and 2 others: Out-of-bounds Write

CVE-2022-0511 is fixed in 5 products on 2 platforms, first by Mozilla Firefox (en-US) 97.0, released February 8, 2022. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2022-0511
- Priority: High
- CVSS: 8.8 (Medium)
- EPSS: 0.0056
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 8, 2022
- Weakness: CWE-787: Out-of-bounds Write
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2022-0511

## Description

Mozilla developers and community members Gabriele Svelto, Sebastian Hengst, Randell Jesup, Luan Herrera, Lars T Hansen, and the Mozilla Fuzzing Team reported memory safety bugs present in Firefox 96. 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 < 97.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Firefox (en-US) | 97.0 | [Mozilla Firefox (en-US) 97.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox-97.0.md) | Feb 8, 2022 |
| 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 |
| Linux | firefox Ubuntu 18.04.6 LTS (bionic) | 97.0+build2-0ubuntu0.18.04.1 | [firefox 97.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-97.0-build2-0ubuntu0.18.04.1.md) | Feb 8, 2022 |
| Linux | firefox Ubuntu 20.04 LTS (focal) | 97.0+build2-0ubuntu0.20.04.1 | [firefox 97.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-97.0-build2-0ubuntu0.20.04.1.md) | Feb 8, 2022 |
| Linux | firefox Ubuntu 22.04.1 LTS (jammy) | 97.0+build2-0ubuntu1 | [firefox 97.0+build2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-firefox-97.0-build2-0ubuntu1.md) | Feb 8, 2022 |
| Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 97.0+build2-0ubuntu0.18.04.1 | [firefox-geckodriver 97.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-97.0-build2-0ubuntu0.18.04.1.md) | Feb 8, 2022 |
| Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 97.0+build2-0ubuntu0.20.04.1 | [firefox-geckodriver 97.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-97.0-build2-0ubuntu0.20.04.1.md) | Feb 8, 2022 |
| Linux | firefox-geckodriver Ubuntu 22.04.1 LTS (jammy) | 97.0+build2-0ubuntu1 | [firefox-geckodriver 97.0+build2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-firefox-geckodriver-97.0-build2-0ubuntu1.md) | Feb 8, 2022 |
| Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 97.0+build2-0ubuntu0.18.04.1 | [firefox-mozsymbols 97.0+build2-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-97.0-build2-0ubuntu0.18.04.1.md) | Feb 8, 2022 |
| Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 97.0+build2-0ubuntu0.20.04.1 | [firefox-mozsymbols 97.0+build2-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-97.0-build2-0ubuntu0.20.04.1.md) | Feb 8, 2022 |
| Linux | firefox-mozsymbols Ubuntu 22.04.1 LTS (jammy) | 97.0+build2-0ubuntu1 | [firefox-mozsymbols 97.0+build2-0ubuntu1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-firefox-mozsymbols-97.0-build2-0ubuntu1.md) | Feb 8, 2022 |

---

Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data

Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.