CVE-2019-1166
MEDIUMCVSS 5.9/10EPSS 61.68%
Last modified
CVE-2019-1166 is a medium-severity vulnerability rated 5.9/10 on the CVSS scale. 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'.. EPSS estimates a 61.68% chance of exploitation in the next 30 days.
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'.
Metrics
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Microsoft | Windows 10 | All versions | — |
| Microsoft | Windows 10 | 1607 | — |
| Microsoft | Windows 10 | 1703 | — |
| Microsoft | Windows 10 | 1709 | — |
| Microsoft | Windows 10 | 1803 | — |
| Microsoft | Windows 10 | 1809 | — |
| Microsoft | Windows 10 | 1903 | — |
| Microsoft | Windows 7 | All versions | Sp1 |
| Microsoft | Windows 8.1 | All versions | — |
| Microsoft | Windows Rt 8.1 | All versions | — |
| Microsoft | Windows Server 2008 | All versions | Sp2 |
| Microsoft | Windows Server 2008 | r2 | Sp1 |
| Microsoft | Windows Server 2012 | All versions | — |
| Microsoft | Windows Server 2012 | r2 | — |
| Microsoft | Windows Server 2016 | All versions | — |
| Microsoft | Windows Server 2016 | 1803 | — |
| Microsoft | Windows Server 2016 | 1903 | — |
| Microsoft | Windows Server 2019 | All versions | — |
References
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1166Patch, Vendor Advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1166Patch, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2019-1166?
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'.
How severe is CVE-2019-1166?
CVE-2019-1166 has a CVSS score of 5.9/10 (MEDIUM severity). The EPSS model estimates a 61.68% probability of exploitation in the next 30 days.
How do I fix CVE-2019-1166?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
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Are you affected by CVE-2019-1166?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST