# CVE-2020-16909: Windows Error Reporting Elevation of Privilege Vulnerability CVE-2020-16909 is fixed in 29 products on 1 platform, first by KB4580346, released October 13, 2020. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2020-16909 - Priority: High - CVSS: 7.8 (Important) - EPSS: 0.0087 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: yes - Vendor exploitability assessment: Exploitation Less Likely - Published: Oct 13, 2020 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-16909 ## Description

An elevation of privilege vulnerability exists in Windows Error Reporting (WER) when WER handles and executes files. The vulnerability could allow elevation of privilege if an attacker can successfully exploit it.

An attacker who successfully exploited the vulnerability could gain greater access to sensitive information and system functionality. To exploit the vulnerability, an attacker could run a specially crafted application.

The security update addresses the vulnerability by correcting the way that WER handles and executes files.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.3986 | [KB4580346](https://patchblox.com/security/data/fix/microsoft/kb4580346.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.3986 | [KB4580346](https://patchblox.com/security/data/fix/microsoft/kb4580346.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.2166 | [KB4580328](https://patchblox.com/security/data/fix/microsoft/kb4580328.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1709 for ARM64-based Systems | 16299.2166 | [KB4580328](https://patchblox.com/security/data/fix/microsoft/kb4580328.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.2166 | [KB4580328](https://patchblox.com/security/data/fix/microsoft/kb4580328.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.1792 | [KB4580330](https://patchblox.com/security/data/fix/microsoft/kb4580330.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.1792 | [KB4580330](https://patchblox.com/security/data/fix/microsoft/kb4580330.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.1792 | [KB4580330](https://patchblox.com/security/data/fix/microsoft/kb4580330.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.1518 | [KB4577668](https://patchblox.com/security/data/fix/microsoft/kb4577668.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.1518 | [KB4577668](https://patchblox.com/security/data/fix/microsoft/kb4577668.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.1518 | [KB4577668](https://patchblox.com/security/data/fix/microsoft/kb4577668.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1903 for 32-bit Systems | | [KB4577671](https://patchblox.com/security/data/fix/microsoft/kb4577671.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1903 for ARM64-based Systems | | [KB4577671](https://patchblox.com/security/data/fix/microsoft/kb4577671.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1903 for x64-based Systems | | [KB4577671](https://patchblox.com/security/data/fix/microsoft/kb4577671.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1909 for 32-bit Systems | | [KB4577671](https://patchblox.com/security/data/fix/microsoft/kb4577671.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1909 for ARM64-based Systems | | [KB4577671](https://patchblox.com/security/data/fix/microsoft/kb4577671.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 1909 for x64-based Systems | | [KB4577671](https://patchblox.com/security/data/fix/microsoft/kb4577671.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 2004 for 32-bit Systems | 19041.572 | [KB4579311](https://patchblox.com/security/data/fix/microsoft/kb4579311.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 2004 for ARM64-based Systems | 19041.572 | [KB4579311](https://patchblox.com/security/data/fix/microsoft/kb4579311.md) | Oct 13, 2020 | | Microsoft | Windows 10 Version 2004 for x64-based Systems | 19041.572 | [KB4579311](https://patchblox.com/security/data/fix/microsoft/kb4579311.md) | Oct 13, 2020 | | Microsoft | Windows 10 for 32-bit Systems | 10240.18725 | [KB4580327](https://patchblox.com/security/data/fix/microsoft/kb4580327.md) | Oct 13, 2020 | | Microsoft | Windows 10 for x64-based Systems | 10240.18725 | [KB4580327](https://patchblox.com/security/data/fix/microsoft/kb4580327.md) | Oct 13, 2020 | | Microsoft | Windows Server 2016 | 14393.3986 | [KB4580346](https://patchblox.com/security/data/fix/microsoft/kb4580346.md) | Oct 13, 2020 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.3986 | [KB4580346](https://patchblox.com/security/data/fix/microsoft/kb4580346.md) | Oct 13, 2020 | | Microsoft | Windows Server 2019 | 17763.1518 | [KB4577668](https://patchblox.com/security/data/fix/microsoft/kb4577668.md) | Oct 13, 2020 | | Microsoft | Windows Server 2019 (Server Core installation) | 17763.1518 | [KB4577668](https://patchblox.com/security/data/fix/microsoft/kb4577668.md) | Oct 13, 2020 | | Microsoft | Windows Server, version 1903 (Server Core installation) | | [KB4577671](https://patchblox.com/security/data/fix/microsoft/kb4577671.md) | Oct 13, 2020 | | Microsoft | Windows Server, version 1909 (Server Core installation) | | [KB4577671](https://patchblox.com/security/data/fix/microsoft/kb4577671.md) | Oct 13, 2020 | | Microsoft | Windows Server, version 2004 (Server Core installation) | 19041.572 | [KB4579311](https://patchblox.com/security/data/fix/microsoft/kb4579311.md) | Oct 13, 2020 | --- Data as of 2026-11-08T00:53:09Z 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 Free to use with attribution: show "Data: Patchblox Patch Radar" with a link to https://patchblox.com/security/patch-radar. Terms, including what needs a written agreement: https://patchblox.com/security/patch-radar/use-the-data Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.