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.
Metrics
Affected Vendors & Products
| Vendors | Products |
|---|---|
| Microsoft |
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Configuration 1 [-]
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No data.
References
History
Fri, 20 Feb 2026 21:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Microsoft windows 10 1507
Microsoft windows 10 1607 Microsoft windows 10 1809 Microsoft windows Server 1803 Microsoft windows Server 1903 Microsoft windows Server 2008 R2 Microsoft windows Server 2008 Sp2 Microsoft windows Server 2012 R2 |
|
| CPEs | cpe:2.3:o:microsoft:windows_10:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_10_1507:*:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1607:*:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:arm64:* cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_7:*:sp1:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_7:*:sp1:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_8.1:*:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_server_1803:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_1903:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2008:*:sp2:*:*:*:*:itanium:* cpe:2.3:o:microsoft:windows_server_2008_R2:*:*:*:*:*:*:itanium:* cpe:2.3:o:microsoft:windows_server_2008_R2:*:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2008_sp2:*:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2008_sp2:*:*:*:*:*:*:x86:* cpe:2.3:o:microsoft:windows_server_2012:*:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2012_R2:*:*:*:*:*:*:x64:* cpe:2.3:o:microsoft:windows_server_2016:*:*:*:*:*:*:*:* cpe:2.3:o:microsoft:windows_server_2019:*:*:*:*:*:*:*:* |
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| Vendors & Products |
Microsoft windows 10 1507
Microsoft windows 10 1607 Microsoft windows 10 1809 Microsoft windows Server 1803 Microsoft windows Server 1903 Microsoft windows Server 2008 R2 Microsoft windows Server 2008 Sp2 Microsoft windows Server 2012 R2 |
Wed, 16 Jul 2025 13:45:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
epss
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epss
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Tue, 20 May 2025 18:00:00 +0000
| Type | Values Removed | Values Added |
|---|---|---|
| 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'. | 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. |
| Title | Windows NTLM Tampering Vulnerability | |
| References |
| |
| Metrics |
cvssV3_1
|
MITRE
Status: PUBLISHED
Assigner: microsoft
Published:
Updated: 2025-05-20T17:50:16.225Z
Reserved: 2018-11-26T00:00:00.000Z
Link: CVE-2019-1040
Vulnrichment
No data.
NVD
Status : Modified
Published: 2019-06-12T14:29:03.713
Modified: 2025-05-20T18:15:39.637
Link: CVE-2019-1040
Redhat
No data.