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
7.7
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Local
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Changed
Temporal Score: 6.9
EPSS Score
0.0329
probability of exploitation in the next 30 days
0.86885 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
41 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 | Yes |
| Windows 7 for x64-based Systems Service Pack 1 | 4519976 (Monthly Rollup) 4520003 (Security Only) |
Important | Spoofing | Yes |
| Windows 8.1 for 32-bit systems | 4520005 (Monthly Rollup) 4519990 (Security Only) |
Important | Spoofing | Yes |
| Windows 8.1 for x64-based systems | 4520005 (Monthly Rollup) 4519990 (Security Only) |
Important | Spoofing | Yes |
| 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 | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | 4520002 (Monthly Rollup) 4520009 (Security Only) |
Important | Spoofing | Yes |
| Windows Server 2008 for Itanium-Based Systems Service Pack 2 | 4520002 (Monthly Rollup) 4520009 (Security Only) |
Important | Spoofing | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 | 4520002 (Monthly Rollup) 4520009 (Security Only) |
Important | Spoofing | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | 4520002 (Monthly Rollup) 4520009 (Security Only) |
Important | Spoofing | Yes |
| Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | 4519976 (Monthly Rollup) 4520003 (Security Only) |
Important | Spoofing | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 | 4519976 (Monthly Rollup) 4520003 (Security Only) |
Important | Spoofing | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | 4519976 (Monthly Rollup) 4520003 (Security Only) |
Important | Spoofing | Yes |
| Windows Server 2012 | 4520007 (Monthly Rollup) 4519985 (Security Only) |
Important | Spoofing | Yes |
| Windows Server 2012 (Server Core installation) | 4520007 (Monthly Rollup) 4519985 (Security Only) |
Important | Spoofing | Yes |
| Windows Server 2012 R2 | 4520005 (Monthly Rollup) 4519990 (Security Only) |
Important | Spoofing | Yes |
| Windows Server 2012 R2 (Server Core installation) | 4520005 (Monthly Rollup) 4519990 (Security Only) |
Important | Spoofing | Yes |
| 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
12 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 |
4519976 (Monthly Rollup) 4520003 |
Monthly Rollup | Yes |
4520005 (Monthly Rollup) 4519990 |
Monthly Rollup | Yes |
4520005 |
Monthly Rollup | Yes |
4520002 (Monthly Rollup) 4520009 |
Monthly Rollup | Yes |
4520007 (Monthly Rollup) 4519985 |
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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