# CVE-2020-1577: DirectWrite Information Disclosure Vulnerability CVE-2020-1577 is fixed in 44 products on 1 platform, first by KB4571694, released August 11, 2020. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2020-1577 - Priority: Routine - CVSS: 5.5 (Important) - EPSS: 0.0709 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Less Likely - Published: Aug 11, 2020 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2020-1577 ## Description

An information disclosure vulnerability exists when DirectWrite improperly discloses the contents of its memory. An attacker who successfully exploited the vulnerability could obtain information to further compromise the user’s system.

There are multiple ways an attacker could exploit the vulnerability, such as by convincing a user to open a specially crafted document, or by convincing a user to visit an untrusted webpage.

The security update addresses the vulnerability by correcting how DirectWrite handles objects in memory.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.3866 | [KB4571694](https://patchblox.com/security/data/fix/microsoft/kb4571694.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.3866 | [KB4571694](https://patchblox.com/security/data/fix/microsoft/kb4571694.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.2045 | [KB4571741](https://patchblox.com/security/data/fix/microsoft/kb4571741.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1709 for ARM64-based Systems | 16299.2045 | [KB4571741](https://patchblox.com/security/data/fix/microsoft/kb4571741.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.2045 | [KB4571741](https://patchblox.com/security/data/fix/microsoft/kb4571741.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.1667 | [KB4571709](https://patchblox.com/security/data/fix/microsoft/kb4571709.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.1667 | [KB4571709](https://patchblox.com/security/data/fix/microsoft/kb4571709.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.1667 | [KB4571709](https://patchblox.com/security/data/fix/microsoft/kb4571709.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.1397 | [KB4565349](https://patchblox.com/security/data/fix/microsoft/kb4565349.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.1397 | [KB4565349](https://patchblox.com/security/data/fix/microsoft/kb4565349.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.1397 | [KB4565349](https://patchblox.com/security/data/fix/microsoft/kb4565349.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1903 for 32-bit Systems | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1903 for ARM64-based Systems | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1903 for x64-based Systems | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1909 for 32-bit Systems | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1909 for ARM64-based Systems | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 1909 for x64-based Systems | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 2004 for 32-bit Systems | 19041.450 | [KB4566782](https://patchblox.com/security/data/fix/microsoft/kb4566782.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 2004 for ARM64-based Systems | 19041.450 | [KB4566782](https://patchblox.com/security/data/fix/microsoft/kb4566782.md) | Aug 11, 2020 | | Microsoft | Windows 10 Version 2004 for x64-based Systems | 19041.450 | [KB4566782](https://patchblox.com/security/data/fix/microsoft/kb4566782.md) | Aug 11, 2020 | | Microsoft | Windows 10 for 32-bit Systems | 10240.18666 | [KB4571692](https://patchblox.com/security/data/fix/microsoft/kb4571692.md) | Aug 11, 2020 | | Microsoft | Windows 10 for x64-based Systems | 10240.18666 | [KB4571692](https://patchblox.com/security/data/fix/microsoft/kb4571692.md) | Aug 11, 2020 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4571729](https://patchblox.com/security/data/fix/microsoft/kb4571729.md) | Aug 11, 2020 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4571719](https://patchblox.com/security/data/fix/microsoft/kb4571719.md) | Aug 11, 2020 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4571729](https://patchblox.com/security/data/fix/microsoft/kb4571729.md) | Aug 11, 2020 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4571719](https://patchblox.com/security/data/fix/microsoft/kb4571719.md) | Aug 11, 2020 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4571703](https://patchblox.com/security/data/fix/microsoft/kb4571703.md) | Aug 11, 2020 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4571723](https://patchblox.com/security/data/fix/microsoft/kb4571723.md) | Aug 11, 2020 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4571703](https://patchblox.com/security/data/fix/microsoft/kb4571703.md) | Aug 11, 2020 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4571723](https://patchblox.com/security/data/fix/microsoft/kb4571723.md) | Aug 11, 2020 | | Microsoft | Windows RT 8.1 | | [KB4571703](https://patchblox.com/security/data/fix/microsoft/kb4571703.md) | Aug 11, 2020 | | Microsoft | 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 | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4571719](https://patchblox.com/security/data/fix/microsoft/kb4571719.md) | Aug 11, 2020 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4571729](https://patchblox.com/security/data/fix/microsoft/kb4571729.md) | Aug 11, 2020 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4571719](https://patchblox.com/security/data/fix/microsoft/kb4571719.md) | Aug 11, 2020 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4571730](https://patchblox.com/security/data/fix/microsoft/kb4571730.md) | Aug 11, 2020 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4571746](https://patchblox.com/security/data/fix/microsoft/kb4571746.md) | Aug 11, 2020 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB4571730](https://patchblox.com/security/data/fix/microsoft/kb4571730.md) | Aug 11, 2020 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB4571746](https://patchblox.com/security/data/fix/microsoft/kb4571746.md) | Aug 11, 2020 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4571730](https://patchblox.com/security/data/fix/microsoft/kb4571730.md) | Aug 11, 2020 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4571746](https://patchblox.com/security/data/fix/microsoft/kb4571746.md) | Aug 11, 2020 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB4571730](https://patchblox.com/security/data/fix/microsoft/kb4571730.md) | Aug 11, 2020 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB4571746](https://patchblox.com/security/data/fix/microsoft/kb4571746.md) | Aug 11, 2020 | | Microsoft | Windows Server 2012 | | [KB4571702](https://patchblox.com/security/data/fix/microsoft/kb4571702.md) | Aug 11, 2020 | | Microsoft | Windows Server 2012 | | [KB4571736](https://patchblox.com/security/data/fix/microsoft/kb4571736.md) | Aug 11, 2020 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4571702](https://patchblox.com/security/data/fix/microsoft/kb4571702.md) | Aug 11, 2020 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4571736](https://patchblox.com/security/data/fix/microsoft/kb4571736.md) | Aug 11, 2020 | | Microsoft | Windows Server 2012 R2 | | [KB4571703](https://patchblox.com/security/data/fix/microsoft/kb4571703.md) | Aug 11, 2020 | | Microsoft | Windows Server 2012 R2 | | [KB4571723](https://patchblox.com/security/data/fix/microsoft/kb4571723.md) | Aug 11, 2020 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4571703](https://patchblox.com/security/data/fix/microsoft/kb4571703.md) | Aug 11, 2020 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4571723](https://patchblox.com/security/data/fix/microsoft/kb4571723.md) | Aug 11, 2020 | | Microsoft | Windows Server 2016 | 14393.3866 | [KB4571694](https://patchblox.com/security/data/fix/microsoft/kb4571694.md) | Aug 11, 2020 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.3866 | [KB4571694](https://patchblox.com/security/data/fix/microsoft/kb4571694.md) | Aug 11, 2020 | | Microsoft | Windows Server 2019 | 17763.1397 | [KB4565349](https://patchblox.com/security/data/fix/microsoft/kb4565349.md) | Aug 11, 2020 | | Microsoft | Windows Server 2019 (Server Core installation) | 17763.1397 | [KB4565349](https://patchblox.com/security/data/fix/microsoft/kb4565349.md) | Aug 11, 2020 | | Microsoft | Windows Server, version 1903 (Server Core installation) | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Windows Server, version 1909 (Server Core installation) | | [KB4565351](https://patchblox.com/security/data/fix/microsoft/kb4565351.md) | Aug 11, 2020 | | Microsoft | Windows Server, version 2004 (Server Core installation) | 19041.450 | [KB4566782](https://patchblox.com/security/data/fix/microsoft/kb4566782.md) | Aug 11, 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.