# CVE-2020-1027: Windows Kernel Elevation of Privilege Vulnerability CVE-2020-1027 is fixed in 41 products on 1 platform, first by KB4550929, released April 14, 2020. It is being exploited: CISA added it to the Known Exploited Vulnerabilities catalog on May 23, 2022. Patch Radar priority: Patch now. - Web page: https://patchblox.com/security/cve/CVE-2020-1027 - Priority: Patch now - CVSS: 7.8 (Important) - EPSS: 0.0472 - CISA KEV: listed May 23, 2022, federal due date Jun 13, 2022 - Exploited (vendor report): yes - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Detected - Published: Apr 14, 2020 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1027 ## Description

An elevation of privilege vulnerability exists in the way that the Windows Kernel handles objects in memory. An attacker who successfully exploited the vulnerability could execute code with elevated permissions.

To exploit the vulnerability, a locally authenticated attacker could run a specially crafted application.

The security update addresses the vulnerability by ensuring the Windows Kernel properly handles objects in memory.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.3630 | [KB4550929](https://patchblox.com/security/data/fix/microsoft/kb4550929.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.3630 | [KB4550929](https://patchblox.com/security/data/fix/microsoft/kb4550929.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.1806 | [KB4550927](https://patchblox.com/security/data/fix/microsoft/kb4550927.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1709 for ARM64-based Systems | 16299.1806 | [KB4550927](https://patchblox.com/security/data/fix/microsoft/kb4550927.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.1806 | [KB4550927](https://patchblox.com/security/data/fix/microsoft/kb4550927.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.1425 | [KB4550922](https://patchblox.com/security/data/fix/microsoft/kb4550922.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.1425 | [KB4550922](https://patchblox.com/security/data/fix/microsoft/kb4550922.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.1425 | [KB4550922](https://patchblox.com/security/data/fix/microsoft/kb4550922.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.1158 | [KB4549949](https://patchblox.com/security/data/fix/microsoft/kb4549949.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.1158 | [KB4549949](https://patchblox.com/security/data/fix/microsoft/kb4549949.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.1158 | [KB4549949](https://patchblox.com/security/data/fix/microsoft/kb4549949.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1903 for 32-bit Systems | | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1903 for ARM64-based Systems | | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1903 for x64-based Systems | | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1909 for 32-bit Systems | | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1909 for ARM64-based Systems | | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 | | Microsoft | Windows 10 Version 1909 for x64-based Systems | | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 | | Microsoft | Windows 10 for 32-bit Systems | 10240.18545 | [KB4550930](https://patchblox.com/security/data/fix/microsoft/kb4550930.md) | Apr 14, 2020 | | Microsoft | Windows 10 for x64-based Systems | 10240.18545 | [KB4550930](https://patchblox.com/security/data/fix/microsoft/kb4550930.md) | Apr 14, 2020 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4550965](https://patchblox.com/security/data/fix/microsoft/kb4550965.md) | Apr 14, 2020 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4550964](https://patchblox.com/security/data/fix/microsoft/kb4550964.md) | Apr 14, 2020 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4550965](https://patchblox.com/security/data/fix/microsoft/kb4550965.md) | Apr 14, 2020 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4550964](https://patchblox.com/security/data/fix/microsoft/kb4550964.md) | Apr 14, 2020 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4550961](https://patchblox.com/security/data/fix/microsoft/kb4550961.md) | Apr 14, 2020 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4550970](https://patchblox.com/security/data/fix/microsoft/kb4550970.md) | Apr 14, 2020 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4550961](https://patchblox.com/security/data/fix/microsoft/kb4550961.md) | Apr 14, 2020 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4550970](https://patchblox.com/security/data/fix/microsoft/kb4550970.md) | Apr 14, 2020 | | Microsoft | Windows RT 8.1 | | [KB4550961](https://patchblox.com/security/data/fix/microsoft/kb4550961.md) | Apr 14, 2020 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4550965](https://patchblox.com/security/data/fix/microsoft/kb4550965.md) | Apr 14, 2020 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4550964](https://patchblox.com/security/data/fix/microsoft/kb4550964.md) | Apr 14, 2020 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4550965](https://patchblox.com/security/data/fix/microsoft/kb4550965.md) | Apr 14, 2020 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4550964](https://patchblox.com/security/data/fix/microsoft/kb4550964.md) | Apr 14, 2020 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4550957](https://patchblox.com/security/data/fix/microsoft/kb4550957.md) | Apr 14, 2020 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4550951](https://patchblox.com/security/data/fix/microsoft/kb4550951.md) | Apr 14, 2020 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB4550957](https://patchblox.com/security/data/fix/microsoft/kb4550957.md) | Apr 14, 2020 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB4550951](https://patchblox.com/security/data/fix/microsoft/kb4550951.md) | Apr 14, 2020 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4550957](https://patchblox.com/security/data/fix/microsoft/kb4550957.md) | Apr 14, 2020 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4550951](https://patchblox.com/security/data/fix/microsoft/kb4550951.md) | Apr 14, 2020 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB4550957](https://patchblox.com/security/data/fix/microsoft/kb4550957.md) | Apr 14, 2020 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB4550951](https://patchblox.com/security/data/fix/microsoft/kb4550951.md) | Apr 14, 2020 | | Microsoft | Windows Server 2012 | | [KB4550917](https://patchblox.com/security/data/fix/microsoft/kb4550917.md) | Apr 14, 2020 | | Microsoft | Windows Server 2012 | | [KB4550971](https://patchblox.com/security/data/fix/microsoft/kb4550971.md) | Apr 14, 2020 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4550917](https://patchblox.com/security/data/fix/microsoft/kb4550917.md) | Apr 14, 2020 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4550971](https://patchblox.com/security/data/fix/microsoft/kb4550971.md) | Apr 14, 2020 | | Microsoft | Windows Server 2012 R2 | | [KB4550961](https://patchblox.com/security/data/fix/microsoft/kb4550961.md) | Apr 14, 2020 | | Microsoft | Windows Server 2012 R2 | | [KB4550970](https://patchblox.com/security/data/fix/microsoft/kb4550970.md) | Apr 14, 2020 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4550961](https://patchblox.com/security/data/fix/microsoft/kb4550961.md) | Apr 14, 2020 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4550970](https://patchblox.com/security/data/fix/microsoft/kb4550970.md) | Apr 14, 2020 | | Microsoft | Windows Server 2016 | 14393.3630 | [KB4550929](https://patchblox.com/security/data/fix/microsoft/kb4550929.md) | Apr 14, 2020 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.3630 | [KB4550929](https://patchblox.com/security/data/fix/microsoft/kb4550929.md) | Apr 14, 2020 | | Microsoft | Windows Server 2019 | 17763.1158 | [KB4549949](https://patchblox.com/security/data/fix/microsoft/kb4549949.md) | Apr 14, 2020 | | Microsoft | Windows Server 2019 (Server Core installation) | 17763.1158 | [KB4549949](https://patchblox.com/security/data/fix/microsoft/kb4549949.md) | Apr 14, 2020 | | Microsoft | Windows Server, version 1803 (Server Core Installation) | 17134.1425 | [KB4550922](https://patchblox.com/security/data/fix/microsoft/kb4550922.md) | Apr 14, 2020 | | Microsoft | Windows Server, version 1903 (Server Core installation) | | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 | | Microsoft | Windows Server, version 1909 (Server Core installation) | | [KB4549951](https://patchblox.com/security/data/fix/microsoft/kb4549951.md) | Apr 14, 2020 | --- 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