# Mozilla Firefox (en-US) 101.0

Mozilla Firefox (en-US) 101.0, released May 31, 2022, fixes 12 CVEs in Mozilla Firefox (en-US). None of them is reported as exploited. Patch Radar priority: High. The latest Mozilla Firefox (en-US) is 159.0, which also fixes every one of these CVEs.

- Web page: https://patchblox.com/security/fix/windows-app/mozilla.firefox-101.0
- Platform: Windows apps
- Released: May 31, 2022
- Priority: High (Closes CVE-2022-31736, high severity)
- CVEs: 12, exploited: 0, on CISA KEV: 0
- Superseded by: [Mozilla Firefox (en-US) 159.0](https://patchblox.com/security/data/product/windows-app/mozilla-firefox-en-us.md), the latest version, which also fixes every CVE listed here

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Mozilla Firefox (en-US)](https://patchblox.com/security/data/product/windows-app/mozilla-firefox-en-us.md) |  | 101.0 |

## CVEs this fix closes

| CVE | Priority | Title | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2022-31736](https://patchblox.com/security/data/cve/CVE-2022-31736.md) | High | Mozilla Thunderbird and 4 others: Permissive Cross-domain Policy with Untrusted Domains | 9.8 | 0.0111 |  |
| [CVE-2022-31747](https://patchblox.com/security/data/cve/CVE-2022-31747.md) | High | Mozilla Thunderbird and 4 others: Improper Restriction of Operations within the Bounds of a Memory Buffer | 9.8 | 0.0094 |  |
| [CVE-2022-31737](https://patchblox.com/security/data/cve/CVE-2022-31737.md) | High | Mozilla Thunderbird and 4 others: Out-of-bounds Write | 9.8 | 0.0087 |  |
| [CVE-2022-31741](https://patchblox.com/security/data/cve/CVE-2022-31741.md) | High | Mozilla Thunderbird and 4 others: Use of Uninitialized Resource | 9.8 | 0.0071 |  |
| [CVE-2022-31739](https://patchblox.com/security/data/cve/CVE-2022-31739.md) | High | Mozilla Thunderbird and 4 others: External Control of File Name or Path | 8.8 | 0.0071 |  |
| [CVE-2022-31748](https://patchblox.com/security/data/cve/CVE-2022-31748.md) | High | Mozilla Firefox ESR and 2 others: Improper Restriction of Operations within the Bounds of a Memory Buffer | 9.8 | 0.0070 |  |
| [CVE-2022-31740](https://patchblox.com/security/data/cve/CVE-2022-31740.md) | High | Mozilla Thunderbird and 4 others: Improper Restriction of Operations within the Bounds of a Memory Buffer | 9.8 | 0.0069 |  |
| [CVE-2022-31742](https://patchblox.com/security/data/cve/CVE-2022-31742.md) | High | Mozilla Thunderbird and 4 others: Observable Discrepancy | 9.8 | 0.0063 |  |
| [CVE-2022-31738](https://patchblox.com/security/data/cve/CVE-2022-31738.md) | High | Mozilla Thunderbird and 4 others: Authentication Bypass by Spoofing | 9.8 | 0.0062 |  |
| [CVE-2022-31744](https://patchblox.com/security/data/cve/CVE-2022-31744.md) | High | Mozilla Thunderbird and 4 others: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | 9.8 | 0.0062 |  |
| [CVE-2022-31743](https://patchblox.com/security/data/cve/CVE-2022-31743.md) | Routine | Mozilla Firefox ESR and 2 others: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') | 6.5 | 0.0046 |  |
| [CVE-2022-31745](https://patchblox.com/security/data/cve/CVE-2022-31745.md) | Routine | Mozilla Firefox ESR and 2 others: Improper Validation of Array Index | 4.3 | 0.0037 |  |

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Data as of 2026-11-08T06:59:42Z 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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