---
title: "CVE-2019-1166: Microsoft Windows vulnerability | CubePath"
description: "A tampering vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLM MIC (Message Integrity…"
language: en
source: https://cubepath.com/security/cve/CVE-2019-1166
---

# CVE-2019-1166: Microsoft Windows vulnerability | CubePath

## Description

A tampering vulnerability exists in Microsoft Windows when a man-in-the-middle attacker is able to successfully bypass the NTLM MIC (Message Integrity Check) protection, aka 'Windows NTLM Tampering Vulnerability'.

Official description from the CVE record, published by microsoft. Copyright © 1999-2026 The MITRE Corporation. See [/security/cve/legal](https://cubepath.com/security/cve/legal) for the CVE license. [View the record on cve.org](https://www.cve.org/CVERecord?id=CVE-2019-1166)

## Key data

### EPSS

Exploit Prediction Scoring System by FIRST: an estimate of the probability that exploitation activity will be observed in the next 30 days.

Score

0.68108 (68.1% probability)

Percentile

99.3%

Scores of

Nov 10, 2026

Model

v2026.06.15

## Affected products

Products listed in the CVE record, as the CNA published them.

- Microsoft Windows

  - affected: 7 for 32-bit Systems Service Pack 1
  - affected: 7 for x64-based Systems Service Pack 1
  - affected: 8.1 for 32-bit systems
  - affected: 8.1 for x64-based systems
  - affected: RT 8.1
  - affected: 10 for 32-bit Systems
  - affected: 10 for x64-based Systems
  - affected: 10 Version 1607 for 32-bit Systems
  - affected: 10 Version 1607 for x64-based Systems
  - affected: 10 Version 1703 for 32-bit Systems
  - affected: 10 Version 1703 for x64-based Systems
  - affected: 10 Version 1709 for 32-bit Systems
  - affected: 10 Version 1709 for x64-based Systems
  - affected: 10 Version 1803 for 32-bit Systems
  - affected: 10 Version 1803 for x64-based Systems
  - affected: 10 Version 1803 for ARM64-based Systems
  - affected: 10 Version 1809 for 32-bit Systems
  - affected: 10 Version 1809 for x64-based Systems
  - affected: 10 Version 1809 for ARM64-based Systems
  - affected: 10 Version 1709 for ARM64-based Systems
- Microsoft Windows Server

  - affected: 2008 R2 for x64-based Systems Service Pack 1 (Core installation)
  - affected: 2008 R2 for Itanium-Based Systems Service Pack 1
  - affected: 2008 R2 for x64-based Systems Service Pack 1
  - affected: 2008 for 32-bit Systems Service Pack 2 (Core installation)
  - affected: 2012
  - affected: 2012 (Core installation)
  - affected: 2012 R2
  - affected: 2012 R2 (Core installation)
  - affected: 2016
  - affected: 2016 (Core installation)
  - affected: version 1803 (Core Installation)
  - affected: 2019
  - affected: 2019 (Core installation)
  - affected: 2008 for Itanium-Based Systems Service Pack 2
  - affected: 2008 for 32-bit Systems Service Pack 2
  - affected: 2008 for x64-based Systems Service Pack 2
  - affected: 2008 for x64-based Systems Service Pack 2 (Core installation)
- Microsoft Windows 10 Version 1903 for 32-bit Systems

  - affected: unspecified
- Microsoft Windows 10 Version 1903 for x64-based Systems

  - affected: unspecified
- Microsoft Windows 10 Version 1903 for ARM64-based Systems

  - affected: unspecified
- Microsoft Windows Server, version 1903 (Server Core installation)

  - affected: unspecified

## References

Links listed in the CVE record. They lead to other sites, which CubePath does not control.

- [portal.msrc.microsoft.com/en-US/security-guidance/advisory/…](https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1166)

## Timeline

1. ID reserved Nov 26, 2018
2. Record published Oct 10, 2019
3. Record last updated Aug 4, 2024

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Data from the CVE Program (MITRE), CISA KEV and FIRST EPSS. CVSS is owned by FIRST and used by permission. Not affiliated with or endorsed by MITRE, CISA or FIRST. Data as of Nov 10, 2026, 20:02 UTC. [Sources and licenses](https://cubepath.com/security/cve/legal)