# CVE-2022-31745: Mozilla Firefox ESR and 2 others: Improper Validation of Array Index

CVE-2022-31745 is fixed in 5 products on 2 platforms, first by Mozilla Firefox (en-US) 101.0, released May 31, 2022. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-31745
- Priority: Routine
- CVSS: 4.3 (Medium)
- EPSS: 0.0037
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 31, 2022
- Weakness: CWE-129: Improper Validation of Array Index
- Vendor advisory: https://nvd.nist.gov/vuln/detail/CVE-2022-31745

## Description

If array shift operations are not used, the Garbage Collector may have become confused about valid objects. This vulnerability affects Firefox < 101.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Windows apps | Mozilla Firefox (en-US) | 101.0 | [Mozilla Firefox (en-US) 101.0](https://patchblox.com/security/data/fix/windows-app/mozilla.firefox-101.0.md) | May 31, 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) | 101.0.1+build1-0ubuntu0.18.04.1 | [firefox 101.0.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-101.0.1-build1-0ubuntu0.18.04.1.md) | May 31, 2022 |
| Linux | firefox Ubuntu 20.04 LTS (focal) | 101.0.1+build1-0ubuntu0.20.04.1 | [firefox 101.0.1+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-101.0.1-build1-0ubuntu0.20.04.1.md) | May 31, 2022 |
| Linux | firefox-geckodriver Ubuntu 18.04.6 LTS (bionic) | 101.0.1+build1-0ubuntu0.18.04.1 | [firefox-geckodriver 101.0.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-geckodriver-101.0.1-build1-0ubuntu0.18.04.1.md) | May 31, 2022 |
| Linux | firefox-geckodriver Ubuntu 20.04 LTS (focal) | 101.0.1+build1-0ubuntu0.20.04.1 | [firefox-geckodriver 101.0.1+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-geckodriver-101.0.1-build1-0ubuntu0.20.04.1.md) | May 31, 2022 |
| Linux | firefox-mozsymbols Ubuntu 18.04.6 LTS (bionic) | 101.0.1+build1-0ubuntu0.18.04.1 | [firefox-mozsymbols 101.0.1+build1-0ubuntu0.18.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-firefox-mozsymbols-101.0.1-build1-0ubuntu0.18.04.1.md) | May 31, 2022 |
| Linux | firefox-mozsymbols Ubuntu 20.04 LTS (focal) | 101.0.1+build1-0ubuntu0.20.04.1 | [firefox-mozsymbols 101.0.1+build1-0ubuntu0.20.04.1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-firefox-mozsymbols-101.0.1-build1-0ubuntu0.20.04.1.md) | May 31, 2022 |

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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

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