Microsoft Windows
CVE-2019-1318 — Microsoft Windows Transport Layer Security Spoofing Vulnerability
Executive Summary
A spoofing vulnerability exists when Transport Layer Security (TLS) accesses non- Extended Master Secret (EMS) sessions. An attacker who successfully exploited this vulnerability may gain access to unauthorized information. To exploit the vulnerability, an attacker would have to conduct a man-in-the-middle attack. The update addresses the vulnerability by correcting how TLS client and server establish and resume sessions with non-EMS peers.
Overview
5.9
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
High
AVAILABILITY
Low
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.9
EPSS Score
0.0329
probability of exploitation in the next 30 days
0.87197 percentile - updated 2026-07-25
View on FIRST.org
Affected Products
25 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4520011 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 for x64-based Systems | 4520011 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4519998 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4519998 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1703 for 32-bit Systems | 4520010 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1703 for x64-based Systems | 4520010 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4520004 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4520004 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4520004 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4520008 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4520008 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4520008 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4519338 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4519338 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4519338 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1903 for 32-bit Systems | 4517389 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4517389 (Security Update) |
Important | Spoofing | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4517389 (Security Update) |
Important | Spoofing | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 4519976 (Monthly Rollup) 4520003 (Security Only) Important Spoofing 4524157 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows 7 for x64-based Systems Service Pack 1 4519976 (Monthly Rollup) 4520003 (Security Only) Important Spoofing 4524157 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows 8.1 for 32-bit systems 4520005 (Monthly Rollup) 4519990 (Security Only) Important Spoofing 4524156 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows 8.1 for x64-based systems 4520005 (Monthly Rollup) 4519990 (Security Only) Important Spoofing 4524156 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows RT 8.1 | 4520005 (Monthly Rollup) |
Important | Spoofing | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 4520002 (Monthly Rollup) 4520009 (Security Only) Important Spoofing 4516026 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4520002 (Monthly Rollup) 4520009 (Security Only) Important Spoofing 4516026 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 for Itanium-Based Systems Service Pack 2 4520002 (Monthly Rollup) 4520009 (Security Only) Important Spoofing 4516026 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 for x64-based Systems Service Pack 2 4520002 (Monthly Rollup) 4520009 (Security Only) Important Spoofing 4516026 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4520002 (Monthly Rollup) 4520009 (Security Only) Important Spoofing 4516026 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 4519976 (Monthly Rollup) 4520003 (Security Only) Important Spoofing 4524157 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 4519976 (Monthly Rollup) 4520003 (Security Only) Important Spoofing 4524157 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4519976 (Monthly Rollup) 4520003 (Security Only) Important Spoofing 4524157 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows Server 2012 4520007 (Monthly Rollup) 4519985 (Security Only) Important Spoofing 4524154 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows Server 2012 (Server Core installation) 4520007 (Monthly Rollup) 4519985 (Security Only) Important Spoofing 4524154 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 4520005 (Monthly Rollup) 4519990 (Security Only) Important Spoofing 4524156 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4520005 (Monthly Rollup) 4519990 (Security Only) Important Spoofing 4524156 Base: 7.7 Temporal: 6.9 Vector: CVSS:3.0/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:L/E:P/RL:O/RC:C Yes None Windows Server 2016 | 4519998 (Security Update) |
Important | Spoofing | Yes |
| Windows Server 2016 (Server Core installation) | 4519998 (Security Update) |
Important | Spoofing | Yes |
| Windows Server 2019 | 4519338 (Security Update) |
Important | Spoofing | Yes |
| Windows Server 2019 (Server Core installation) | 4519338 (Security Update) |
Important | Spoofing | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4520008 (Security Update) |
Important | Spoofing | Yes |
| Windows Server, version 1903 (Server Core installation) | 4517389 (Security Update) |
Important | Spoofing | Yes |
Patches
8 patches
| Article | Type | Restart |
|---|---|---|
4520011 |
Security Update | Yes |
4519998 |
Security Update | Yes |
4520010 |
Security Update | Yes |
4520004 |
Security Update | Yes |
4520008 |
Security Update | Yes |
4519338 |
Security Update | Yes |
4517389 |
Security Update | Yes |
4520005 |
Monthly Rollup | Yes |
Known Exploits
No known exploits have been linked for this CVE yet. When available, exploit references will be sourced from public repositories and may be unverified, incomplete, or non-functional. Always review code carefully before use in any environment.
Acknowledgments
Thijs Alkemade (@xnyhps) of Computest
References
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