Microsoft Windows
CVE-2020-17047 — Windows Network File System Denial of Service Vulnerability
Executive Summary
None
Overview
7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
None
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.7
EPSS Score
0.25285
probability of exploitation in the next 30 days
0.97668 percentile - updated 2026-06-21
View on FIRST.org
Affected Products
30 affected products
| Product | KB Article | Severity | Impact | Restart Required |
|---|---|---|---|---|
| Windows 10 for 32-bit Systems | 4586787 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 for x64-based Systems | 4586787 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1607 for 32-bit Systems | 4586830 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1607 for x64-based Systems | 4586830 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1803 for 32-bit Systems | 4586785 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1803 for ARM64-based Systems | 4586785 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1803 for x64-based Systems | 4586785 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1809 for 32-bit Systems | 4586793 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1809 for ARM64-based Systems | 4586793 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1809 for x64-based Systems | 4586793 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1903 for 32-bit Systems | 4586786 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1903 for ARM64-based Systems | 4586786 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1903 for x64-based Systems | 4586786 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1909 for 32-bit Systems | 4586786 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1909 for ARM64-based Systems | 4586786 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 1909 for x64-based Systems | 4586786 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 2004 for 32-bit Systems | 4586781 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 2004 for ARM64-based Systems | 4586781 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 2004 for x64-based Systems | 4586781 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 20H2 for 32-bit Systems | 4586781 (Security Update) |
Important | Denial of Service | Yes |
| Windows 10 Version 20H2 for ARM64-based Systems | 4586781 (Security Update) |
Important | Denial of Service | Yes |
| Windows 7 for 32-bit Systems Service Pack 1 4586827 (Monthly Rollup) 4586805 (Security Only) Important Denial of Service 4580345 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4586827 4586805 Windows 7 for x64-based Systems Service Pack 1 4586827 (Monthly Rollup) 4586805 (Security Only) Important Denial of Service 4580345 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4586827 4586805 Windows 8.1 for 32-bit systems 4586845 (Monthly Rollup) 4586823 (Security Only) Important Denial of Service 4580347 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4586845 4586823 Windows 8.1 for x64-based systems 4586845 (Monthly Rollup) 4586823 (Security Only) Important Denial of Service 4580347 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4586845 4586823 Windows RT 8.1 | 4586845 (Monthly Rollup) |
Important | Denial of Service | Yes |
| Windows Server 2008 R2 for x64-based Systems Service Pack 1 4586827 (Monthly Rollup) 4586805 (Security Only) Important Denial of Service 4580345 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4586827 4586805 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4586827 (Monthly Rollup) 4586805 (Security Only) Important Denial of Service 4580345 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4586827 4586805 Windows Server 2012 4586834 (Monthly Rollup) 4586808 (Security Only) Important Denial of Service 4580382 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4586834 4586808 Windows Server 2012 (Server Core installation) 4586834 (Monthly Rollup) 4586808 (Security Only) Important Denial of Service 4580382 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4586834 4586808 Windows Server 2012 R2 4586845 (Monthly Rollup) 4586823 (Security Only) Important Denial of Service 4580347 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4586845 4586823 Windows Server 2012 R2 (Server Core installation) 4586845 (Monthly Rollup) 4586823 (Security Only) Important Denial of Service 4580347 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4586845 4586823 Windows Server 2016 | 4586830 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2016 (Server Core installation) | 4586830 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2019 | 4586793 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server 2019 (Server Core installation) | 4586793 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 1903 (Server Core installation) | 4586786 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 1909 (Server Core installation) | 4586786 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 2004 (Server Core installation) | 4586781 (Security Update) |
Important | Denial of Service | Yes |
| Windows Server, version 20H2 (Server Core Installation) | 4586781 (Security Update) |
Important | Denial of Service | Yes |
Patches
7 patches
| Article | Type | Restart |
|---|---|---|
4586787 |
Security Update | Yes |
4586830 |
Security Update | Yes |
4586785 |
Security Update | Yes |
4586793 |
Security Update | Yes |
4586786 |
Security Update | Yes |
4586781 |
Security Update | Yes |
4586845 |
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
Soyeon Park - Microsoft Platform Security Assurance & Vulnerability Research
References
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