# CVE-2019-1365: Microsoft IIS Server Elevation of Privilege Vulnerability CVE-2019-1365 is fixed in 34 products on 1 platform, first by KB4519998, released October 8, 2019. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2019-1365 - Priority: High - CVSS: 7.5 (Important) - EPSS: 0.0435 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Less Likely - Published: Oct 8, 2019 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1365 ## Description

An elevation of privilege vulnerability exists when Microsoft IIS Server fails to check the length of a buffer prior to copying memory to it.

An attacker who successfully exploited this vulnerability can allow an unprivileged function ran by the user to execute code in the context of NT AUTHORITY\system escaping the Sandbox.

The security update addresses the vulnerability by correcting how Microsoft IIS Server sanitizes web requests.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.3274 | [KB4519998](https://patchblox.com/security/data/fix/microsoft/kb4519998.md) | Oct 8, 2019 | | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.3274 | [KB4519998](https://patchblox.com/security/data/fix/microsoft/kb4519998.md) | Oct 8, 2019 | | Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.1069 | [KB4520008](https://patchblox.com/security/data/fix/microsoft/kb4520008.md) | Oct 8, 2019 | | Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.1069 | [KB4520008](https://patchblox.com/security/data/fix/microsoft/kb4520008.md) | Oct 8, 2019 | | Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.1069 | [KB4520008](https://patchblox.com/security/data/fix/microsoft/kb4520008.md) | Oct 8, 2019 | | Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.805 | [KB4519338](https://patchblox.com/security/data/fix/microsoft/kb4519338.md) | Oct 8, 2019 | | Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.805 | [KB4519338](https://patchblox.com/security/data/fix/microsoft/kb4519338.md) | Oct 8, 2019 | | Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.805 | [KB4519338](https://patchblox.com/security/data/fix/microsoft/kb4519338.md) | Oct 8, 2019 | | Microsoft | Windows 10 Version 1903 for 32-bit Systems | 18362.418 | [KB4517389](https://patchblox.com/security/data/fix/microsoft/kb4517389.md) | Oct 8, 2019 | | Microsoft | Windows 10 Version 1903 for ARM64-based Systems | 18362.418 | [KB4517389](https://patchblox.com/security/data/fix/microsoft/kb4517389.md) | Oct 8, 2019 | | Microsoft | Windows 10 Version 1903 for x64-based Systems | 18362.418 | [KB4517389](https://patchblox.com/security/data/fix/microsoft/kb4517389.md) | Oct 8, 2019 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4519976](https://patchblox.com/security/data/fix/microsoft/kb4519976.md) | Oct 8, 2019 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4520003](https://patchblox.com/security/data/fix/microsoft/kb4520003.md) | Oct 8, 2019 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4519976](https://patchblox.com/security/data/fix/microsoft/kb4519976.md) | Oct 8, 2019 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4520003](https://patchblox.com/security/data/fix/microsoft/kb4520003.md) | Oct 8, 2019 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4520005](https://patchblox.com/security/data/fix/microsoft/kb4520005.md) | Oct 8, 2019 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4519990](https://patchblox.com/security/data/fix/microsoft/kb4519990.md) | Oct 8, 2019 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4520005](https://patchblox.com/security/data/fix/microsoft/kb4520005.md) | Oct 8, 2019 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4519990](https://patchblox.com/security/data/fix/microsoft/kb4519990.md) | Oct 8, 2019 | | Microsoft | Windows RT 8.1 | | [KB4520005](https://patchblox.com/security/data/fix/microsoft/kb4520005.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | | [KB4519976](https://patchblox.com/security/data/fix/microsoft/kb4519976.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | | [KB4520003](https://patchblox.com/security/data/fix/microsoft/kb4520003.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4519976](https://patchblox.com/security/data/fix/microsoft/kb4519976.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4520003](https://patchblox.com/security/data/fix/microsoft/kb4520003.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4519976](https://patchblox.com/security/data/fix/microsoft/kb4519976.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4520003](https://patchblox.com/security/data/fix/microsoft/kb4520003.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4520002](https://patchblox.com/security/data/fix/microsoft/kb4520002.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4520009](https://patchblox.com/security/data/fix/microsoft/kb4520009.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB4520002](https://patchblox.com/security/data/fix/microsoft/kb4520002.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB4520009](https://patchblox.com/security/data/fix/microsoft/kb4520009.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 for Itanium-Based Systems Service Pack 2 | | [KB4520002](https://patchblox.com/security/data/fix/microsoft/kb4520002.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 for Itanium-Based Systems Service Pack 2 | | [KB4520009](https://patchblox.com/security/data/fix/microsoft/kb4520009.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4520002](https://patchblox.com/security/data/fix/microsoft/kb4520002.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4520009](https://patchblox.com/security/data/fix/microsoft/kb4520009.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB4520002](https://patchblox.com/security/data/fix/microsoft/kb4520002.md) | Oct 8, 2019 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB4520009](https://patchblox.com/security/data/fix/microsoft/kb4520009.md) | Oct 8, 2019 | | Microsoft | Windows Server 2012 | | [KB4520007](https://patchblox.com/security/data/fix/microsoft/kb4520007.md) | Oct 8, 2019 | | Microsoft | Windows Server 2012 | | [KB4519985](https://patchblox.com/security/data/fix/microsoft/kb4519985.md) | Oct 8, 2019 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4520007](https://patchblox.com/security/data/fix/microsoft/kb4520007.md) | Oct 8, 2019 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4519985](https://patchblox.com/security/data/fix/microsoft/kb4519985.md) | Oct 8, 2019 | | Microsoft | Windows Server 2012 R2 | | [KB4520005](https://patchblox.com/security/data/fix/microsoft/kb4520005.md) | Oct 8, 2019 | | Microsoft | Windows Server 2012 R2 | | [KB4519990](https://patchblox.com/security/data/fix/microsoft/kb4519990.md) | Oct 8, 2019 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4520005](https://patchblox.com/security/data/fix/microsoft/kb4520005.md) | Oct 8, 2019 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4519990](https://patchblox.com/security/data/fix/microsoft/kb4519990.md) | Oct 8, 2019 | | Microsoft | Windows Server 2016 | 14393.3274 | [KB4519998](https://patchblox.com/security/data/fix/microsoft/kb4519998.md) | Oct 8, 2019 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.3274 | [KB4519998](https://patchblox.com/security/data/fix/microsoft/kb4519998.md) | Oct 8, 2019 | | Microsoft | Windows Server 2019 | 17763.805 | [KB4519338](https://patchblox.com/security/data/fix/microsoft/kb4519338.md) | Oct 8, 2019 | | Microsoft | Windows Server 2019 (Server Core installation) | 17763.805 | [KB4519338](https://patchblox.com/security/data/fix/microsoft/kb4519338.md) | Oct 8, 2019 | | Microsoft | Windows Server, version 1803 (Server Core Installation) | 17134.1069 | [KB4520008](https://patchblox.com/security/data/fix/microsoft/kb4520008.md) | Oct 8, 2019 | | Microsoft | Windows Server, version 1903 (Server Core installation) | 18362.418 | [KB4517389](https://patchblox.com/security/data/fix/microsoft/kb4517389.md) | Oct 8, 2019 | --- 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 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.