Windows IIS
CVE-2019-0941 — Microsoft IIS Server Denial of Service Vulnerability
Executive Summary
A denial of service exists in Microsoft IIS Server when the optional request filtering feature improperly handles requests. An attacker who successfully exploited this vulnerability could perform a temporary denial of service against pages configured to use request filtering. To exploit this vulnerability, an attacker could send a specially crafted request to a page utilizing request filtering. The update addresses the vulnerability by changing the way certain requests are processed by the filter.
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
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
Temporal Score: 6.7
EPSS Score
0.03041
probability of exploitation in the next 30 days
0.85805 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 | 4503291 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 for x64-based Systems | 4503291 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4503267 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4503267 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1703 for 32-bit Systems | 4503279 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1703 for x64-based Systems | 4503279 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1709 for 32-bit Systems | 4503284 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1709 for ARM64-based Systems | 4503284 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1709 for x64-based Systems | 4503284 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4503286 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4503286 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4503286 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4503327 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4503327 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4503327 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1903 for 32-bit Systems | 4503293 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4503293 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4503293 (Security Update) |
Important | Denial of Service | No |
| Windows 7 for 32-bit Systems Service Pack 1 | 4503292 (Monthly Rollup) 4503269 (Security Only) |
Important | Denial of Service | Yes |
| Windows 7 for x64-based Systems Service Pack 1 | 4503292 (Monthly Rollup) 4503269 (Security Only) |
Important | Denial of Service | Yes |
| Windows 8.1 for 32-bit systems | 4503276 (Monthly Rollup) 4503290 (Security Only) |
Important | Denial of Service | Yes |
| Windows 8.1 for x64-based systems | 4503276 (Monthly Rollup) 4503290 (Security Only) |
Important | Denial of Service | Yes |
| Windows RT 8.1 | 4503276 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 | 4503273 (Monthly Rollup) 4503287 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) | 4503273 (Monthly Rollup) 4503287 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 for Itanium-Based Systems Service Pack 2 | 4503273 (Monthly Rollup) 4503287 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 | 4503273 (Monthly Rollup) 4503287 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) | 4503273 (Monthly Rollup) 4503287 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 R2 for Itanium-Based Systems Service Pack 1 | 4503292 (Monthly Rollup) 4503269 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 | 4503292 (Monthly Rollup) 4503269 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) | 4503292 (Monthly Rollup) 4503269 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2012 | 4503285 (Monthly Rollup) 4503263 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2012 (Server Core installation) | 4503285 (Monthly Rollup) 4503263 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2012 R2 | 4503276 (Monthly Rollup) 4503290 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2012 R2 (Server Core installation) | 4503276 (Monthly Rollup) 4503290 (Security Only) |
Important | Denial of Service | Yes |
| Windows Server 2016 | 4503267 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2016 (Server Core installation) | 4503267 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2019 | 4503327 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2019 (Server Core installation) | 4503327 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 1803 (Server Core Installation) | 4503286 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 1903 (Server Core installation) | 4503293 (Security Update) |
Important | Denial of Service | No |
Patches
12 patches
| Article | Type | Restart |
|---|---|---|
4503291 |
Security Update | Yes |
4503267 |
Security Update | Yes |
4503279 |
Security Update | Yes |
4503284 |
Security Update | Yes |
4503286 |
Security Update | Yes |
4503327 |
Security Update | Yes |
4503293 |
Security Update | Yes |
4503292 (Monthly Rollup) 4503269 |
Monthly Rollup | Yes |
4503276 (Monthly Rollup) 4503290 |
Monthly Rollup | Yes |
4503276 |
Monthly Rollup | Yes |
4503273 (Monthly Rollup) 4503287 |
Monthly Rollup | Yes |
4503285 (Monthly Rollup) 4503263 |
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
References
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