# CVE-2019-1019: Microsoft Windows Security Feature Bypass Vulnerability CVE-2019-1019 is fixed in 41 products on 1 platform, first by KB4503267, released June 11, 2019. It is not reported as exploited. Patch Radar priority: High. - Web page: https://patchblox.com/security/cve/CVE-2019-1019 - Priority: High - CVSS: 8.5 (Important) - EPSS: 0.1512 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Vendor exploitability assessment: Exploitation Less Likely - Published: Jun 11, 2019 - Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1019 ## Description

A security feature bypass vulnerability exists where a NETLOGON message is able to obtain the session key and sign messages.

To exploit this vulnerability, an attacker could send a specially crafted authentication request. An attacker who successfully exploited this vulnerability could access another machine using the original user privileges.

The issue has been addressed by changing how NTLM validates network authentication messages.

## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Microsoft | Windows 10 Version 1607 for 32-bit Systems | 14393.3025 | [KB4503267](https://patchblox.com/security/data/fix/microsoft/kb4503267.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1607 for x64-based Systems | 14393.3025 | [KB4503267](https://patchblox.com/security/data/fix/microsoft/kb4503267.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1703 for 32-bit Systems | 15063.1868 | [KB4503279](https://patchblox.com/security/data/fix/microsoft/kb4503279.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1703 for x64-based Systems | 15063.1868 | [KB4503279](https://patchblox.com/security/data/fix/microsoft/kb4503279.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1709 for 32-bit Systems | 16299.1217 | [KB4503284](https://patchblox.com/security/data/fix/microsoft/kb4503284.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1709 for ARM64-based Systems | 16299.1217 | [KB4503284](https://patchblox.com/security/data/fix/microsoft/kb4503284.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1709 for x64-based Systems | 16299.1217 | [KB4503284](https://patchblox.com/security/data/fix/microsoft/kb4503284.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1803 for 32-bit Systems | 17134.829 | [KB4503286](https://patchblox.com/security/data/fix/microsoft/kb4503286.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1803 for ARM64-based Systems | 17134.829 | [KB4503286](https://patchblox.com/security/data/fix/microsoft/kb4503286.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1803 for x64-based Systems | 17134.829 | [KB4503286](https://patchblox.com/security/data/fix/microsoft/kb4503286.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1809 for 32-bit Systems | 17763.557 | [KB4503327](https://patchblox.com/security/data/fix/microsoft/kb4503327.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1809 for ARM64-based Systems | 17763.557 | [KB4503327](https://patchblox.com/security/data/fix/microsoft/kb4503327.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1809 for x64-based Systems | 17763.557 | [KB4503327](https://patchblox.com/security/data/fix/microsoft/kb4503327.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1903 for 32-bit Systems | 18362.175 | [KB4503293](https://patchblox.com/security/data/fix/microsoft/kb4503293.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1903 for ARM64-based Systems | 18362.175 | [KB4503293](https://patchblox.com/security/data/fix/microsoft/kb4503293.md) | Jun 11, 2019 | | Microsoft | Windows 10 Version 1903 for x64-based Systems | 18362.175 | [KB4503293](https://patchblox.com/security/data/fix/microsoft/kb4503293.md) | Jun 11, 2019 | | Microsoft | Windows 10 for 32-bit Systems | 10240.18244 | [KB4503291](https://patchblox.com/security/data/fix/microsoft/kb4503291.md) | Jun 11, 2019 | | Microsoft | Windows 10 for x64-based Systems | 10240.18244 | [KB4503291](https://patchblox.com/security/data/fix/microsoft/kb4503291.md) | Jun 11, 2019 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4503292](https://patchblox.com/security/data/fix/microsoft/kb4503292.md) | Jun 11, 2019 | | Microsoft | Windows 7 for 32-bit Systems Service Pack 1 | | [KB4503269](https://patchblox.com/security/data/fix/microsoft/kb4503269.md) | Jun 11, 2019 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4503292](https://patchblox.com/security/data/fix/microsoft/kb4503292.md) | Jun 11, 2019 | | Microsoft | Windows 7 for x64-based Systems Service Pack 1 | | [KB4503269](https://patchblox.com/security/data/fix/microsoft/kb4503269.md) | Jun 11, 2019 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4503276](https://patchblox.com/security/data/fix/microsoft/kb4503276.md) | Jun 11, 2019 | | Microsoft | Windows 8.1 for 32-bit systems | | [KB4503290](https://patchblox.com/security/data/fix/microsoft/kb4503290.md) | Jun 11, 2019 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4503276](https://patchblox.com/security/data/fix/microsoft/kb4503276.md) | Jun 11, 2019 | | Microsoft | Windows 8.1 for x64-based systems | | [KB4503290](https://patchblox.com/security/data/fix/microsoft/kb4503290.md) | Jun 11, 2019 | | Microsoft | Windows RT 8.1 | | [KB4503276](https://patchblox.com/security/data/fix/microsoft/kb4503276.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | | [KB4503292](https://patchblox.com/security/data/fix/microsoft/kb4503292.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | | [KB4503269](https://patchblox.com/security/data/fix/microsoft/kb4503269.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4503292](https://patchblox.com/security/data/fix/microsoft/kb4503292.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 | | [KB4503269](https://patchblox.com/security/data/fix/microsoft/kb4503269.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4503292](https://patchblox.com/security/data/fix/microsoft/kb4503292.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | | [KB4503269](https://patchblox.com/security/data/fix/microsoft/kb4503269.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4503273](https://patchblox.com/security/data/fix/microsoft/kb4503273.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 | | [KB4503287](https://patchblox.com/security/data/fix/microsoft/kb4503287.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB4503273](https://patchblox.com/security/data/fix/microsoft/kb4503273.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | | [KB4503287](https://patchblox.com/security/data/fix/microsoft/kb4503287.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 for Itanium-Based Systems Service Pack 2 | | [KB4503273](https://patchblox.com/security/data/fix/microsoft/kb4503273.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 for Itanium-Based Systems Service Pack 2 | | [KB4503287](https://patchblox.com/security/data/fix/microsoft/kb4503287.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4503273](https://patchblox.com/security/data/fix/microsoft/kb4503273.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 | | [KB4503287](https://patchblox.com/security/data/fix/microsoft/kb4503287.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB4503273](https://patchblox.com/security/data/fix/microsoft/kb4503273.md) | Jun 11, 2019 | | Microsoft | Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | | [KB4503287](https://patchblox.com/security/data/fix/microsoft/kb4503287.md) | Jun 11, 2019 | | Microsoft | Windows Server 2012 | | [KB4503285](https://patchblox.com/security/data/fix/microsoft/kb4503285.md) | Jun 11, 2019 | | Microsoft | Windows Server 2012 | | [KB4503263](https://patchblox.com/security/data/fix/microsoft/kb4503263.md) | Jun 11, 2019 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4503285](https://patchblox.com/security/data/fix/microsoft/kb4503285.md) | Jun 11, 2019 | | Microsoft | Windows Server 2012 (Server Core installation) | | [KB4503263](https://patchblox.com/security/data/fix/microsoft/kb4503263.md) | Jun 11, 2019 | | Microsoft | Windows Server 2012 R2 | | [KB4503276](https://patchblox.com/security/data/fix/microsoft/kb4503276.md) | Jun 11, 2019 | | Microsoft | Windows Server 2012 R2 | | [KB4503290](https://patchblox.com/security/data/fix/microsoft/kb4503290.md) | Jun 11, 2019 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4503276](https://patchblox.com/security/data/fix/microsoft/kb4503276.md) | Jun 11, 2019 | | Microsoft | Windows Server 2012 R2 (Server Core installation) | | [KB4503290](https://patchblox.com/security/data/fix/microsoft/kb4503290.md) | Jun 11, 2019 | | Microsoft | Windows Server 2016 | 14393.3025 | [KB4503267](https://patchblox.com/security/data/fix/microsoft/kb4503267.md) | Jun 11, 2019 | | Microsoft | Windows Server 2016 (Server Core installation) | 14393.3025 | [KB4503267](https://patchblox.com/security/data/fix/microsoft/kb4503267.md) | Jun 11, 2019 | | Microsoft | Windows Server 2019 | 17763.557 | [KB4503327](https://patchblox.com/security/data/fix/microsoft/kb4503327.md) | Jun 11, 2019 | | Microsoft | Windows Server 2019 (Server Core installation) | 17763.557 | [KB4503327](https://patchblox.com/security/data/fix/microsoft/kb4503327.md) | Jun 11, 2019 | | Microsoft | Windows Server, version 1803 (Server Core Installation) | 17134.829 | [KB4503286](https://patchblox.com/security/data/fix/microsoft/kb4503286.md) | Jun 11, 2019 | | Microsoft | Windows Server, version 1903 (Server Core installation) | 18362.175 | [KB4503293](https://patchblox.com/security/data/fix/microsoft/kb4503293.md) | Jun 11, 2019 | --- 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