Windows IIS
CVE-2019-1365 — Microsoft IIS Server Elevation of Privilege Vulnerability
Executive Summary
An elevation of privilege vulnerability exists when Microsoft IIS Server fails to check the length of a buffer prior to copying memory to it. An attacker who successfully exploited this vulnerability can allow an unprivileged function ran by the user to execute code in the context of NT AUTHORITY\system escaping the Sandbox. The security update addresses the vulnerability by correcting how Microsoft IIS Server sanitizes web requests.
Overview
7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
ATTACK VECTOR
Network
ATTACK COMPLEXITY
High
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
Temporal Score: 6.7
EPSS Score
0.04064
probability of exploitation in the next 30 days
0.89354 percentile - updated 2026-06-20
View on FIRST.org
Affected Products
34 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 Version 1607 for 32-bit Systems | 4519998 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4519998 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4520008 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4520008 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4520008 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4519338 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4519338 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4519338 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1903 for 32-bit Systems | 4517389 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4517389 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4517389 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 | 4519976 (Monthly Rollup) 4520003 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows 7 for x64-based Systems Service Pack 1 | 4519976 (Monthly Rollup) 4520003 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows 8.1 for 32-bit systems | 4520005 (Monthly Rollup) 4519990 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows 8.1 for x64-based systems | 4520005 (Monthly Rollup) 4519990 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows RT 8.1 | 4520005 (Monthly Rollup) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 | 4520002 (Monthly Rollup) 4520009 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | 4520002 (Monthly Rollup) 4520009 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for Itanium-Based Systems Service Pack 2 | 4520002 (Monthly Rollup) 4520009 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 | 4520002 (Monthly Rollup) 4520009 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | 4520002 (Monthly Rollup) 4520009 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | 4519976 (Monthly Rollup) 4520003 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 | 4519976 (Monthly Rollup) 4520003 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | 4519976 (Monthly Rollup) 4520003 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 | 4520007 (Monthly Rollup) 4519985 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 (Server Core installation) | 4520007 (Monthly Rollup) 4519985 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 R2 | 4520005 (Monthly Rollup) 4519990 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2012 R2 (Server Core installation) | 4520005 (Monthly Rollup) 4519990 (Security Only) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 | 4519998 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2016 (Server Core installation) | 4519998 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 | 4519338 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server 2019 (Server Core installation) | 4519338 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4520008 (Security Update) |
Important | Elevation of Privilege | Yes |
| Windows Server, version 1903 (Server Core installation) | 4517389 (Security Update) |
Important | Elevation of Privilege | Yes |
Patches
9 patches
| Article | Type | Restart |
|---|---|---|
4519998 |
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
Netanel Ben-Simon and Yoav Alon from Check Point Research
References
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