# KB4601349: February 2021 security update

KB4601349, released February 9, 2021, fixes 17 CVEs across 4 products. One of them is being exploited (CVE-2020-1472); 1 on CISA KEV. Patch Radar priority: Patch now.

- Web page: https://patchblox.com/security/fix/microsoft/kb4601349
- Platform: Microsoft
- Released: Feb 9, 2021
- Priority: Patch now (Closes CVE-2020-1472, exploited (CISA KEV, ransomware))
- CVEs: 17, exploited: 1, on CISA KEV: 1
- Vendor advisory: https://support.microsoft.com/help/4601349

## Applies to

| Product | Release | Fixed in |
|---|---|---|
| [Windows 8.1 for 32-bit systems](https://patchblox.com/security/data/product/microsoft/windows-8.1-for-32-bit-systems.md) |  |  |
| [Windows 8.1 for x64-based systems](https://patchblox.com/security/data/product/microsoft/windows-8.1-for-x64-based-systems.md) |  |  |
| [Windows Server 2012 R2](https://patchblox.com/security/data/product/microsoft/windows-server-2012-r2.md) |  |  |
| [Windows Server 2012 R2 (Server Core installation)](https://patchblox.com/security/data/product/microsoft/windows-server-2012-r2-server-core-installation.md) |  |  |

## CVEs this fix closes

| CVE | Priority | Component | CVSS | EPSS | Exploitation |
|---|---|---|---:|---:|---|
| [CVE-2020-1472](https://patchblox.com/security/data/cve/CVE-2020-1472.md) | Patch now | Windows Netlogon | 10.0 | 0.9939 | CISA KEV, Ransomware |
| [CVE-2021-24086](https://patchblox.com/security/data/cve/CVE-2021-24086.md) | Urgent | Windows TCP/IP | 7.5 | 0.5896 | More likely |
| [CVE-2021-24074](https://patchblox.com/security/data/cve/CVE-2021-24074.md) | Urgent | Windows TCP/IP | 9.8 | 0.2616 | More likely |
| [CVE-2021-24094](https://patchblox.com/security/data/cve/CVE-2021-24094.md) | Urgent | Windows TCP/IP | 9.8 | 0.2214 | More likely |
| [CVE-2021-24078](https://patchblox.com/security/data/cve/CVE-2021-24078.md) | Urgent | Role: DNS Server | 9.8 | 0.1189 | More likely |
| [CVE-2021-24077](https://patchblox.com/security/data/cve/CVE-2021-24077.md) | Urgent | Role: Windows Fax Service | 9.8 | 0.0287 |  |
| [CVE-2021-1722](https://patchblox.com/security/data/cve/CVE-2021-1722.md) | Urgent | Role: Windows Fax Service | 8.1 | 0.0244 |  |
| [CVE-2021-24088](https://patchblox.com/security/data/cve/CVE-2021-24088.md) | Urgent | Windows Print Spooler Components | 8.8 | 0.0243 |  |
| [CVE-2021-1727](https://patchblox.com/security/data/cve/CVE-2021-1727.md) | Urgent | Windows Installer | 7.8 | 0.0076 | Disclosed |
| [CVE-2021-1734](https://patchblox.com/security/data/cve/CVE-2021-1734.md) | High | Windows Remote Procedure Call | 7.5 | 0.0381 |  |
| [CVE-2021-24083](https://patchblox.com/security/data/cve/CVE-2021-24083.md) | High | Windows Address Book | 7.8 | 0.0287 |  |
| [CVE-2021-24103](https://patchblox.com/security/data/cve/CVE-2021-24103.md) | High | Windows Event Tracing | 7.8 | 0.0063 |  |
| [CVE-2021-25195](https://patchblox.com/security/data/cve/CVE-2021-25195.md) | High | Windows PKU2U | 7.8 | 0.0063 |  |
| [CVE-2021-24102](https://patchblox.com/security/data/cve/CVE-2021-24102.md) | High | Windows Event Tracing | 7.8 | 0.0055 |  |
| [CVE-2021-24080](https://patchblox.com/security/data/cve/CVE-2021-24080.md) | Routine | Windows Trust Verification API | 6.5 | 0.0305 |  |
| [CVE-2021-24076](https://patchblox.com/security/data/cve/CVE-2021-24076.md) | Routine | Role: Windows Hyper-V | 5.5 | 0.0095 |  |
| [CVE-2021-24079](https://patchblox.com/security/data/cve/CVE-2021-24079.md) | Routine | Windows Backup Engine | 5.5 | 0.0095 |  |

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Data as of 2026-11-07T12:40:37Z 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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