MEDIUM
Windows NTLM Tampering Vulnerability
Published Jun 12, 2019
5.3
MEDIUMCVSS 3.1
EPSS 48.04%
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. 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.
Affected products
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- Version 10.0.10240.0StatusaffectedConstraints<publication
- Version
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- Version 10.0.14393.0StatusaffectedConstraints<publication
- Version
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- Version 10.0.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.0StatusaffectedConstraints<publication
- Version 10.0.17763.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.0StatusaffectedConstraints<publication
- Version
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- Version 6.1.0StatusaffectedConstraints<publication
- Version
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- Version 6.1.0StatusaffectedConstraints<publication
- Version
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- Version 6.3.0StatusaffectedConstraints<publication
- Version
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- Version 6.0.6003.0StatusaffectedConstraints<publication
- Version
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- Version 6.1.7601.0StatusaffectedConstraints<publication
- Version
- Vendor Microsoft Product Windows Server 2008 R2 Service Pack 1 (Server Core installation) Defaultn/a
- Version 6.1.7601.0StatusaffectedConstraints<publication
- Version
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- Version 6.1.0StatusaffectedConstraints<publication
- Version
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- Version 6.0.0StatusaffectedConstraints<publication
- Version 6.0.6003.0StatusaffectedConstraints<publication
- Version
-
- Version 6.0.6003.0StatusaffectedConstraints<publication
- Version
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- Version 6.2.9200.0StatusaffectedConstraints<publication
- Version
-
- Version 6.2.9200.0StatusaffectedConstraints<publication
- Version
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- Version 6.3.9600.0StatusaffectedConstraints<publication
- Version
-
- Version 6.3.9600.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.14393.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.14393.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.17763.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.17763.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.0StatusaffectedConstraints<publication
- Version
-
- Version 10.0.0StatusaffectedConstraints<publication
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | |||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Microsoft | Windows 10 Version 1507 | n/a |
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| Microsoft | Windows 10 Version 1607 | n/a |
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| Microsoft | Windows 10 Version 1703 | n/a |
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| Microsoft | Windows 10 Version 1709 | n/a |
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| Microsoft | Windows 10 Version 1709 for 32-bit Systems | n/a |
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| Microsoft | Windows 10 Version 1803 | n/a |
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| Microsoft | Windows 10 Version 1809 | n/a |
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| Microsoft | Windows 10 Version 1903 for 32-bit Systems | n/a |
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| Microsoft | Windows 10 Version 1903 for ARM64-based Systems | n/a |
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| Microsoft | Windows 10 Version 1903 for x64-based Systems | n/a |
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| Microsoft | Windows 7 | n/a |
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| Microsoft | Windows 7 Service Pack 1 | n/a |
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| Microsoft | Windows 8.1 | n/a |
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| Microsoft | Windows Server 2008 Service Pack 2 | n/a |
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| Microsoft | Windows Server 2008 R2 Service Pack 1 | n/a |
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| Microsoft | Windows Server 2008 R2 Service Pack 1 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2008 R2 Systems Service Pack 1 | n/a |
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| Microsoft | Windows Server 2008 Service Pack 2 | n/a |
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| Microsoft | Windows Server 2008 Service Pack 2 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2012 | n/a |
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| Microsoft | Windows Server 2012 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2012 R2 | n/a |
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| Microsoft | Windows Server 2012 R2 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2016 | n/a |
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| Microsoft | Windows Server 2016 (Server Core installation) | n/a |
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| Microsoft | Windows Server 2019 | n/a |
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| Microsoft | Windows Server 2019 (Server Core installation) | n/a |
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| Microsoft | Windows Server, version 1803 (Server Core Installation) | n/a |
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| Microsoft | Windows Server, version 1903 (Server Core installation) | n/a |
|
OR
- n/a
- 1607
- 1703
- 1709
- 1803
- 1809
- 1903
- n/a
- n/a
- n/a
- n/a
- r2
- r2
- n/a
- r2
- n/a
- 1803
- 1903
- n/a
No data.
No Red Hat product state for this CVE.
No package ranges for this CVE.
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
5.3 MEDIUM CVE.org
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N/E:P/RL:O/RC:C
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Impact None
Integrity Impact High
Availability Impact None
Exploit Maturity Proof of Concept
1 other source (NVD) ▾
5.3 MEDIUM NVD
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:H/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality Impact None
Integrity Impact High
Availability Impact None
5.9 MEDIUM NVD
CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:N
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction None
Scope Unchanged
Confidentiality Impact None
Integrity Impact High
Availability Impact None
4.3 MEDIUM NVD
AV:N/AC:M/Au:N/C:N/I:P/A:N
Access Vector Network
Access Complexity Medium
Authentication None
Confidentiality Impact None
Integrity Impact Partial
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
48.04% 0.48043
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 2, 2026.
EPSS probability 0.48043
Score over time
2021–2026- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Percentile over time
- EPSS v1
- EPSS v2
- EPSS v3
- EPSS v4
- EPSS v5
Table of values (61 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 2, 2026 | 48.04% (0.48043) | 98.82th | v5 (v2026.06.15) |
| Sep 22, 2026 | 48.04% (0.48043) | 98.80th | v5 (v2026.06.15) |
| Sep 21, 2026 | 33.30% (0.33303) | 98.34th | v5 (v2026.06.15) |
| Sep 6, 2026 | 48.04% (0.48043) | 98.77th | v5 (v2026.06.15) |
| Sep 5, 2026 | 33.30% (0.33303) | 98.30th | v5 (v2026.06.15) |
| Aug 30, 2026 | 48.04% (0.48043) | 98.77th | v5 (v2026.06.15) |
| Aug 28, 2026 | 33.30% (0.33303) | 98.29th | v5 (v2026.06.15) |
| Aug 24, 2026 | 48.04% (0.48043) | 98.76th | v5 (v2026.06.15) |
| Aug 23, 2026 | 33.30% (0.33303) | 98.29th | v5 (v2026.06.15) |
| Jun 15, 2026 | 48.04% (0.48043) | 98.70th | v5 (v2026.06.15) |
| Mar 4, 2026 | 89.68% (0.89678) | 99.55th | v4 (v2025.03.14) |
| Mar 1, 2026 | 86.19% (0.86185) | 99.39th | v4 (v2025.03.14) |
| Feb 4, 2026 | 89.77% (0.89770) | 99.55th | v4 (v2025.03.14) |
| Feb 1, 2026 | 86.34% (0.86344) | 99.40th | v4 (v2025.03.14) |
| Jan 4, 2026 | 89.77% (0.89770) | 99.54th | v4 (v2025.03.14) |
| Jan 1, 2026 | 86.34% (0.86344) | 99.39th | v4 (v2025.03.14) |
| Dec 4, 2025 | 89.68% (0.89678) | 99.53th | v4 (v2025.03.14) |
| Dec 1, 2025 | 86.19% (0.86185) | 99.37th | v4 (v2025.03.14) |
| Nov 21, 2025 | 89.68% (0.89678) | 99.53th | v4 (v2025.03.14) |
| Nov 18, 2025 | 87.86% (0.87857) | 99.56th | v4 (v2025.03.14) |
| Nov 4, 2025 | 89.68% (0.89678) | 99.53th | v4 (v2025.03.14) |
| Nov 1, 2025 | 86.19% (0.86185) | 99.37th | v4 (v2025.03.14) |
| Oct 4, 2025 | 90.61% (0.90610) | 99.59th | v4 (v2025.03.14) |
| Oct 1, 2025 | 87.79% (0.87790) | 99.45th | v4 (v2025.03.14) |
| Sep 4, 2025 | 90.61% (0.90610) | 99.60th | v4 (v2025.03.14) |
| Sep 1, 2025 | 87.79% (0.87790) | 99.45th | v4 (v2025.03.14) |
| Aug 5, 2025 | 90.61% (0.90610) | 99.59th | v4 (v2025.03.14) |
| Aug 1, 2025 | 87.79% (0.87790) | 99.45th | v4 (v2025.03.14) |
| Jul 16, 2025 | 90.61% (0.90610) | 99.58th | v4 (v2025.03.14) |
| Jul 5, 2025 | 86.67% (0.86668) | 99.37th | v4 (v2025.03.14) |
| Jul 1, 2025 | 81.06% (0.81062) | 99.10th | v4 (v2025.03.14) |
| Jun 28, 2025 | 86.67% (0.86668) | 99.36th | v4 (v2025.03.14) |
| Jun 5, 2025 | 88.30% (0.88302) | 99.45th | v4 (v2025.03.14) |
| Jun 1, 2025 | 83.83% (0.83828) | 99.24th | v4 (v2025.03.14) |
| May 21, 2025 | 88.30% (0.88302) | 99.44th | v4 (v2025.03.14) |
| May 6, 2025 | 90.09% (0.90092) | 99.55th | v4 (v2025.03.14) |
| May 1, 2025 | 88.79% (0.88793) | 99.48th | v4 (v2025.03.14) |
| Apr 19, 2025 | 90.09% (0.90092) | 99.54th | v4 (v2025.03.14) |
| Apr 18, 2025 | 88.35% (0.88346) | 99.44th | v4 (v2025.03.14) |
| Apr 17, 2025 | 90.09% (0.90092) | 99.54th | v4 (v2025.03.14) |
| Apr 16, 2025 | 88.35% (0.88346) | 99.44th | v4 (v2025.03.14) |
| Apr 7, 2025 | 90.04% (0.90039) | 99.57th | v4 (v2025.03.14) |
| Apr 6, 2025 | 88.27% (0.88271) | 99.47th | v4 (v2025.03.14) |
| Mar 20, 2025 | 90.04% (0.90039) | 99.59th | v4 (v2025.03.14) |
| Mar 18, 2025 | 88.72% (0.88723) | 99.51th | v4 (v2025.03.14) |
| Mar 17, 2025 | 90.36% (0.90362) | 99.59th | v4 (v2025.03.14) |
| Dec 12, 2024 | 2.44% (0.02436) | 90.38th | v3 (v2023.03.01) |
| Nov 23, 2024 | 2.44% (0.02436) | 90.37th | v3 (v2023.03.01) |
| Nov 8, 2023 | 5.47% (0.05470) | 92.37th | v3 (v2023.03.01) |
| Oct 24, 2023 | 5.57% (0.05567) | 92.39th | v3 (v2023.03.01) |
| Jul 8, 2023 | 7.37% (0.07372) | 93.16th | v3 (v2023.03.01) |
| May 8, 2023 | 57.34% (0.57339) | 97.15th | v3 (v2023.03.01) |
| Mar 7, 2023 | 44.82% (0.44821) | 96.78th | v3 (v2023.03.01) |
| Mar 6, 2023 | 21.82% (0.21815) | 96.59th | v2 (v2022.01.01) |
| Dec 7, 2022 | 21.82% (0.21815) | 96.50th | v2 (v2022.01.01) |
| May 21, 2022 | 22.11% (0.22106) | 96.37th | v2 (v2022.01.01) |
| Feb 4, 2022 | 32.59% (0.32588) | 96.53th | v2 (v2022.01.01) |
| Feb 3, 2022 | 17.64% (0.17642) | 92.83th | v1 |
| Jan 6, 2022 | 17.64% (0.17642) | 92.74th | v1 |
| Sep 1, 2021 | 17.64% (0.17642) | 97.74th | v1 |
| Apr 14, 2021 | 17.64% (0.17642) | 0.00th | v1 |
Weaknesses (0)
No CWE recorded.
References (2)
- https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1040 vendor-advisory
- https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1040 PatchVendor Advisory
| Link | Providers | Tags |
|---|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2019-1040 | vendor-advisory | |
| https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2019-1040 | PatchVendor Advisory |
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner microsoft
Published Jun 12, 2019
Updated May 20, 2025
Reserved Nov 26, 2018
Link CVE-2019-1040
CISA Vulnrichment
Updated n/a