Windows NTLM Tampering Vulnerability
Priority MEDIUM 54Published · Updated
Key facts
- Attack vector
- Network
- Privileges required
- None
- User interaction
- Required
- Attack complexity
- High
- Impact type
- —
- Confidentiality · integrity · availability
- None · High · None
- Fix status
- Fixed
Attack profile from CVSS 3.1 · CNA. Fix status from CNA.
Summary
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. An attacker who successfully exploited this vulnerability could gain the ability to downgrade NTLM security features. To exploit this vulnerability, the attacker would need to tamper with the NTLM exchange. The attacker could then modify flags of the NTLM packet without invalidating the signature. The update addresses the vulnerability by hardening NTLM MIC protection on the server-side.
Why it matters now
EPSS 0.48043 98th percentileScored 2026-11-07
Fix Fixed Windows 10 Version 1703 (Microsoft): publicationWindows 10 Version 1803 (Microsoft): publication+27 more products
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
| Vendor | Product | Affected versions | Fixed in | Status | Source |
|---|---|---|---|---|---|
| Microsoft | Windows 10 Version 1703 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1803 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server, version 1803 (Server Core Installation) | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1809 | 10.0.17763.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1809 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2019 | 10.0.17763.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2019 (Server Core installation) | 10.0.17763.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1709 for 32-bit Systems | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1709 | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1903 for 32-bit Systems | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1903 for x64-based Systems | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1903 for ARM64-based Systems | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server, version 1903 (Server Core installation) | 10.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1507 | 10.0.10240.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 10 Version 1607 | 10.0.14393.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2016 | 10.0.14393.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2016 (Server Core installation) | 10.0.14393.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 7 | 6.1.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 7 Service Pack 1 | 6.1.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows 8.1 | 6.3.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2008 Service Pack 2 | 6.0.6003.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | 6.0.6003.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2008 Service Pack 2 | 6.0.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2008 Service Pack 2 | 6.0.6003.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2008 R2 Systems Service Pack 1 | 6.1.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2008 R2 Service Pack 1 | 6.1.7601.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | 6.1.7601.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2012 | 6.2.9200.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2012 (Server Core installation) | 6.2.9200.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2012 R2 | 6.3.9600.0 to before publication | publication | Patch available | CNA |
| Microsoft | Windows Server 2012 R2 (Server Core installation) | 6.3.9600.0 to before publication | publication | Patch available | CNA |
- Windows 10 Version 1703 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1803 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server, version 1803 (Server Core Installation) VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1809 VendorMicrosoft Affected 10.0.17763.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1809 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2019 VendorMicrosoft Affected 10.0.17763.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2019 (Server Core installation) VendorMicrosoft Affected 10.0.17763.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1709 for 32-bit Systems VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1709 VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1903 for 32-bit Systems VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1903 for x64-based Systems VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1903 for ARM64-based Systems VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server, version 1903 (Server Core installation) VendorMicrosoft Affected 10.0.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1507 VendorMicrosoft Affected 10.0.10240.0 to before publication Fixed in publication Patch available CNA
- Windows 10 Version 1607 VendorMicrosoft Affected 10.0.14393.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2016 VendorMicrosoft Affected 10.0.14393.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2016 (Server Core installation) VendorMicrosoft Affected 10.0.14393.0 to before publication Fixed in publication Patch available CNA
- Windows 7 VendorMicrosoft Affected 6.1.0 to before publication Fixed in publication Patch available CNA
- Windows 7 Service Pack 1 VendorMicrosoft Affected 6.1.0 to before publication Fixed in publication Patch available CNA
- Windows 8.1 VendorMicrosoft Affected 6.3.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2008 Service Pack 2 VendorMicrosoft Affected 6.0.6003.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2008 Service Pack 2 (Server Core installation) VendorMicrosoft Affected 6.0.6003.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2008 Service Pack 2 VendorMicrosoft Affected 6.0.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2008 Service Pack 2 VendorMicrosoft Affected 6.0.6003.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2008 R2 Systems Service Pack 1 VendorMicrosoft Affected 6.1.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2008 R2 Service Pack 1 VendorMicrosoft Affected 6.1.7601.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2008 R2 Service Pack 1 (Server Core installation) VendorMicrosoft Affected 6.1.7601.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2012 VendorMicrosoft Affected 6.2.9200.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2012 (Server Core installation) VendorMicrosoft Affected 6.2.9200.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2012 R2 VendorMicrosoft Affected 6.3.9600.0 to before publication Fixed in publication Patch available CNA
- Windows Server 2012 R2 (Server Core installation) VendorMicrosoft Affected 6.3.9600.0 to before publication Fixed in publication Patch available CNA
CPE configurations NVD · 19
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:* | 1607 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1703:*:*:*:*:*:*:* | 1703 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1709:*:*:*:*:*:*:* | 1709 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:* | 1803 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:* | 1809 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_10:1903:*:*:*:*:*:*:* | 1903 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
- cpe:2.3:o:microsoft:windows_10:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1607:*:*:*:*:*:*:* Versions 1607 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1703:*:*:*:*:*:*:* Versions 1703 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1709:*:*:*:*:*:*:* Versions 1709 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1803:*:*:*:*:*:*:* Versions 1803 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1809:*:*:*:*:*:*:* Versions 1809 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_10:1903:*:*:*:*:*:*:* Versions 1903 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_7:-:sp1:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_8.1:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_rt_8.1:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
Show 9 more CPE
| CPE | Versions | Role | Vendor |
|---|---|---|---|
| cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:itanium:* | r2 sp1 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* | r2 sp1 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* | r2 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2016:1803:*:*:*:*:*:*:* | 1803 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2016:1903:*:*:*:*:*:*:* | 1903 | Vulnerable | Microsoft |
| cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* | not specified by NVD | Vulnerable | Microsoft |
- cpe:2.3:o:microsoft:windows_server_2008:-:sp2:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:itanium:* Versions r2 sp1 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2008:r2:sp1:*:*:*:*:x64:* Versions r2 sp1 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2012:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2012:r2:*:*:*:*:*:*:* Versions r2 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2016:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2016:1803:*:*:*:*:*:*:* Versions 1803 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2016:1903:*:*:*:*:*:*:* Versions 1903 Vulnerable ·Microsoft
- cpe:2.3:o:microsoft:windows_server_2019:-:*:*:*:*:*:*:* Versions not specified by NVD Vulnerable ·Microsoft
Remediation
- Fix · CNA Windows 10 Version 1703 (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1803 (Microsoft) Fixed in publication
- Fix · CNA Windows Server, version 1803 (Server Core Installation) (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1809 (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1809 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2019 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2019 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1709 for 32-bit Systems (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1709 (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1903 for 32-bit Systems (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1903 for x64-based Systems (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1903 for ARM64-based Systems (Microsoft) Fixed in publication
- Fix · CNA Windows Server, version 1903 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1507 (Microsoft) Fixed in publication
- Fix · CNA Windows 10 Version 1607 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2016 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2016 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows 7 (Microsoft) Fixed in publication
- Fix · CNA Windows 7 Service Pack 1 (Microsoft) Fixed in publication
- Fix · CNA Windows 8.1 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2008 Service Pack 2 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2008 Service Pack 2 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2008 Service Pack 2 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2008 Service Pack 2 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2008 R2 Systems Service Pack 1 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2008 R2 Service Pack 1 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2008 R2 Service Pack 1 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2012 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2012 (Server Core installation) (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2012 R2 (Microsoft) Fixed in publication
- Fix · CNA Windows Server 2012 R2 (Server Core installation) (Microsoft) Fixed in publication
Timeline
- 2026-10-02 Threatist record created from CVE-2019-1040
- 2026-10-03 Alias added: GHSA-8vpr-83m7-3f7q
References
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- TI-2015-01587 Mount Manager in Microsoft Windows Vista SP2, Windows Server 2008 SP2 and R2 SP1, Windows… KEVCVSS 3.1MEDIUM 6.6
Sources
- CVE-2019-1040 · CVE Program
- CVE-2019-1040 · NVD
- FIRST EPSS
- GHSA-8vpr-83m7-3f7q · GitHub Advisory Database · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences