# CVE-2020-1567: MSHTML Engine Remote Code Execution Vulnerability CVE-2020-1567 is fixed in 34 products on 1 platform, first by KB4571694, released August 11, 2020. 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-2020-1567 - Priority: Urgent - CVSS: 7.5 (Critical) - EPSS: 0.0367 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation More Likely - Published: Aug 11, 2020 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1567 ## Description

A remote code execution vulnerability exists in the way that the MSHTML engine improperly validates input.

An attacker could execute arbitrary code in the context of the current user. If the current user is logged on with administrative user rights, an attacker who successfully exploited the vulnerability could take control of an affected system. An attacker could then install programs; view, change, or delete data; or create new accounts with full user rights.

In a HTML editing attack scenario, an attacker could trick a user into editing a specially crafted file that is designed to exploit the vulnerability.

The security update addresses the vulnerability by modifying how MSHTML engine validates input.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Internet Explorer 11 on Windows 10 Version 1607 for 32-bit Systems | 14393.3866 | [KB4571694](https://patchblox.com/security/data/fix/microsoft/kb4571694.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1607 for x64-based Systems | 14393.3866 | [KB4571694](https://patchblox.com/security/data/fix/microsoft/kb4571694.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1709 for 32-bit Systems | 16299.2045 | [KB4571741](https://patchblox.com/security/data/fix/microsoft/kb4571741.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1709 for ARM64-based Systems | 16299.2045 | [KB4571741](https://patchblox.com/security/data/fix/microsoft/kb4571741.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1709 for x64-based Systems | 16299.2045 | [KB4571741](https://patchblox.com/security/data/fix/microsoft/kb4571741.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1803 for 32-bit Systems | 17134.1667 | [KB4571709](https://patchblox.com/security/data/fix/microsoft/kb4571709.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1803 for ARM64-based Systems | 17134.1667 | [KB4571709](https://patchblox.com/security/data/fix/microsoft/kb4571709.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1803 for x64-based Systems | 17134.1667 | [KB4571709](https://patchblox.com/security/data/fix/microsoft/kb4571709.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1809 for 32-bit Systems | 17763.1397 | [KB4565349](https://patchblox.com/security/data/fix/microsoft/kb4565349.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1809 for ARM64-based Systems | 17763.1397 | [KB4565349](https://patchblox.com/security/data/fix/microsoft/kb4565349.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1809 for x64-based Systems | 17763.1397 | [KB4565349](https://patchblox.com/security/data/fix/microsoft/kb4565349.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1903 for 32-bit Systems | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1903 for ARM64-based Systems | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1903 for x64-based Systems | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1909 for 32-bit Systems | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1909 for ARM64-based Systems | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 1909 for x64-based Systems | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 2004 for 32-bit Systems | 19041.450 | [KB4566782](https://patchblox.com/security/data/fix/microsoft/kb4566782.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 2004 for ARM64-based Systems | 19041.450 | [KB4566782](https://patchblox.com/security/data/fix/microsoft/kb4566782.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 Version 2004 for x64-based Systems | 19041.450 | [KB4566782](https://patchblox.com/security/data/fix/microsoft/kb4566782.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 for 32-bit Systems | 10240.18666 | [KB4571692](https://patchblox.com/security/data/fix/microsoft/kb4571692.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 10 for x64-based Systems | 10240.18666 | [KB4571692](https://patchblox.com/security/data/fix/microsoft/kb4571692.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 | | [KB4571687](https://patchblox.com/security/data/fix/microsoft/kb4571687.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 7 for 32-bit Systems Service Pack 1 | | [KB4571729](https://patchblox.com/security/data/fix/microsoft/kb4571729.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 | | [KB4571687](https://patchblox.com/security/data/fix/microsoft/kb4571687.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 7 for x64-based Systems Service Pack 1 | | [KB4571729](https://patchblox.com/security/data/fix/microsoft/kb4571729.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 8.1 for 32-bit systems | | [KB4571687](https://patchblox.com/security/data/fix/microsoft/kb4571687.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 8.1 for 32-bit systems | | [KB4571703](https://patchblox.com/security/data/fix/microsoft/kb4571703.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 8.1 for x64-based systems | | [KB4571687](https://patchblox.com/security/data/fix/microsoft/kb4571687.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows 8.1 for x64-based systems | | [KB4571703](https://patchblox.com/security/data/fix/microsoft/kb4571703.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows RT 8.1 | | [KB4571703](https://patchblox.com/security/data/fix/microsoft/kb4571703.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4571687](https://patchblox.com/security/data/fix/microsoft/kb4571687.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4571729](https://patchblox.com/security/data/fix/microsoft/kb4571729.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows Server 2012 | | [KB4571687](https://patchblox.com/security/data/fix/microsoft/kb4571687.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows Server 2012 | | [KB4571736](https://patchblox.com/security/data/fix/microsoft/kb4571736.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows Server 2012 R2 | | [KB4571687](https://patchblox.com/security/data/fix/microsoft/kb4571687.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows Server 2012 R2 | | [KB4571703](https://patchblox.com/security/data/fix/microsoft/kb4571703.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows Server 2016 | 14393.3866 | [KB4571694](https://patchblox.com/security/data/fix/microsoft/kb4571694.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 11 on Windows Server 2019 | 17763.1397 | [KB4565349](https://patchblox.com/security/data/fix/microsoft/kb4565349.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4571730](https://patchblox.com/security/data/fix/microsoft/kb4571730.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 9 on Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4571687](https://patchblox.com/security/data/fix/microsoft/kb4571687.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4571730](https://patchblox.com/security/data/fix/microsoft/kb4571730.md) | Aug 11, 2020 | | Microsoft | Internet Explorer 9 on Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4571687](https://patchblox.com/security/data/fix/microsoft/kb4571687.md) | Aug 11, 2020 | --- Data as of 2026-11-08T00:53:09Z UTC. 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