# CVE-2019-0637: Windows Defender Firewall Security Feature Bypass Vulnerability

CVE-2019-0637 is fixed in 13 products on 1 platform, first by KB4486996, released February 12, 2019. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2019-0637
- Priority: Routine
- CVSS: 5.3 (Important)
- EPSS: 0.0430
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: yes
- Vendor exploitability assessment: Exploitation Less Likely
- Published: Feb 12, 2019
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-0637

## Description

<p>A security feature bypass vulnerability exists when Windows Defender Firewall incorrectly applies firewall profiles to cellular network connections. This vulnerability occurs when Windows is connected to both an ethernet network and a cellular network.</p> <p>An attacker would have no way to trigger this vulnerability remotely, and this vulnerability by itself does not allow Windows to be exploited.</p> <p>This update addresses the behavior by correcting how Windows Defender Firewall handles firewall profiles when ethernet and cellular network connections are both present.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.967 | [KB4486996](https://patchblox.com/security/data/fix/microsoft/kb4486996.md) | Feb 12, 2019 |
| Microsoft | Windows 10 Version 1709 for ARM64-based Systems | 16299.967 | [KB4486996](https://patchblox.com/security/data/fix/microsoft/kb4486996.md) | Feb 12, 2019 |
| Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.967 | [KB4486996](https://patchblox.com/security/data/fix/microsoft/kb4486996.md) | Feb 12, 2019 |
| Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.590 | [KB4487017](https://patchblox.com/security/data/fix/microsoft/kb4487017.md) | Feb 12, 2019 |
| Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.590 | [KB4487017](https://patchblox.com/security/data/fix/microsoft/kb4487017.md) | Feb 12, 2019 |
| Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.590 | [KB4487017](https://patchblox.com/security/data/fix/microsoft/kb4487017.md) | Feb 12, 2019 |
| Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.316 | [KB4487044](https://patchblox.com/security/data/fix/microsoft/kb4487044.md) | Feb 12, 2019 |
| Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.316 | [KB4487044](https://patchblox.com/security/data/fix/microsoft/kb4487044.md) | Feb 12, 2019 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.316 | [KB4487044](https://patchblox.com/security/data/fix/microsoft/kb4487044.md) | Feb 12, 2019 |
| Microsoft | Windows Server 2019 | 17763.316 | [KB4487044](https://patchblox.com/security/data/fix/microsoft/kb4487044.md) | Feb 12, 2019 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.316 | [KB4487044](https://patchblox.com/security/data/fix/microsoft/kb4487044.md) | Feb 12, 2019 |
| Microsoft | Windows Server, version 1709  (Server Core Installation) | 16299.967 | [KB4486996](https://patchblox.com/security/data/fix/microsoft/kb4486996.md) | Feb 12, 2019 |
| Microsoft | Windows Server, version 1803  (Server Core Installation) | 17134.590 | [KB4487017](https://patchblox.com/security/data/fix/microsoft/kb4487017.md) | Feb 12, 2019 |

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Data as of 2026-11-07T18:46:35Z 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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