# CVE-2019-0840: Windows Kernel Information Disclosure Vulnerability

CVE-2019-0840 is fixed in 13 products on 1 platform, first by KB4493441, released April 9, 2019. It is not reported as exploited, but the vendor rates exploitation more likely. Patch Radar priority: Urgent.

- Web page: https://patchblox.com/security/cve/CVE-2019-0840
- Priority: Urgent
- CVSS: 5.5 (Important)
- EPSS: 0.0213
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Vendor exploitability assessment: Exploitation More Likely
- Published: Apr 9, 2019
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-0840

## Description

<p>An information disclosure vulnerability exists when the Windows kernel improperly handles objects in memory. An attacker who successfully exploited this vulnerability could obtain information to further compromise the user’s system.</p> <p>To exploit this vulnerability, an attacker would have to log on to an affected system and run a specially crafted application. The vulnerability would not allow an attacker to execute code or to elevate user rights directly, but it could be used to obtain information that could be used to try to further compromise the affected system.</p> <p>The update addresses the vulnerability by correcting how the Windows kernel handles objects in memory.</p>

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.1087 | [KB4493441](https://patchblox.com/security/data/fix/microsoft/kb4493441.md) | Apr 9, 2019 |
| Microsoft | Windows 10 Version 1709 for ARM64-based Systems | 16299.1087 | [KB4493441](https://patchblox.com/security/data/fix/microsoft/kb4493441.md) | Apr 9, 2019 |
| Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.1087 | [KB4493441](https://patchblox.com/security/data/fix/microsoft/kb4493441.md) | Apr 9, 2019 |
| Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.706 | [KB4493464](https://patchblox.com/security/data/fix/microsoft/kb4493464.md) | Apr 9, 2019 |
| Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.706 | [KB4493464](https://patchblox.com/security/data/fix/microsoft/kb4493464.md) | Apr 9, 2019 |
| Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.706 | [KB4493464](https://patchblox.com/security/data/fix/microsoft/kb4493464.md) | Apr 9, 2019 |
| Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.437 | [KB4493509](https://patchblox.com/security/data/fix/microsoft/kb4493509.md) | Apr 9, 2019 |
| Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.437 | [KB4493509](https://patchblox.com/security/data/fix/microsoft/kb4493509.md) | Apr 9, 2019 |
| Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.437 | [KB4493509](https://patchblox.com/security/data/fix/microsoft/kb4493509.md) | Apr 9, 2019 |
| Microsoft | Windows Server 2019 | 17763.437 | [KB4493509](https://patchblox.com/security/data/fix/microsoft/kb4493509.md) | Apr 9, 2019 |
| Microsoft | Windows Server 2019 (Server Core installation) | 17763.437 | [KB4493509](https://patchblox.com/security/data/fix/microsoft/kb4493509.md) | Apr 9, 2019 |
| Microsoft | Windows Server, version 1709  (Server Core Installation) | 16299.1087 | [KB4493441](https://patchblox.com/security/data/fix/microsoft/kb4493441.md) | Apr 9, 2019 |
| Microsoft | Windows Server, version 1803  (Server Core Installation) | 17134.706 | [KB4493464](https://patchblox.com/security/data/fix/microsoft/kb4493464.md) | Apr 9, 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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