CVE-2020-17051 — Windows Network File System Remote Code Execution Vulnerability

Executive Summary

None

Overview

9.8

CVSS CRITICAL

Critical

MS Severity

Not Exploited

MS Exploit Status

More Likely

MS Exploit Likelihood

Category Remote Code Execution

Released Nov 10 2020

Last Updated Nov 10 2020

Publicly Disclosed No

CISA KEV Not Listed

Known Exploits None Known

EPSS Score 0.09857 — 0.94953 percentile

NVD CVSS 9.8 CRITICAL — matches MSRC

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C

ATTACK VECTOR

Network

ATTACK COMPLEXITY

Low

PRIVILEGES REQUIRED

None

USER INTERACTION

None

SCOPE

Unchanged

CONFIDENTIALITY

High

INTEGRITY

High

AVAILABILITY

High

EXPLOIT CODE MATURITY

Unproven

REMEDIATION LEVEL

Official Fix

REPORT CONFIDENCE

Confirmed

Temporal Score: 8.5

EPSS Score

0.09857

probability of exploitation in the next 30 days

0.94953 percentile - updated 2026-06-21

View on FIRST.org

Affected Products

8 affected products

Product	KB Article	Severity	Impact	Restart Required
Windows Server 2008 for 32-bit Systems Service Pack 2 4586807 (Monthly Rollup) 4586817 (Security Only) Critical Remote Code Execution 4580378 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4586807 4586817 Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 4586807 (Monthly Rollup) 4586817 (Security Only) Critical Remote Code Execution 4580378 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4586807 4586817 Windows Server 2008 for x64-based Systems Service Pack 2 4586807 (Monthly Rollup) 4586817 (Security Only) Critical Remote Code Execution 4580378 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4586807 4586817 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4586807 (Monthly Rollup) 4586817 (Security Only) Critical Remote Code Execution 4580378 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4586807 4586817 Windows Server 2008 R2 for x64-based Systems Service Pack 1 4586827 (Monthly Rollup) 4586805 (Security Only) Critical Remote Code Execution 4580345 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/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) Critical Remote Code Execution 4580345 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4586827 4586805 Windows Server 2012 4586834 (Monthly Rollup) 4586808 (Security Only) Critical Remote Code Execution 4580382 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4586834 4586808 Windows Server 2012 (Server Core installation) 4586834 (Monthly Rollup) 4586808 (Security Only) Critical Remote Code Execution 4580382 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4586834 4586808 Windows Server 2012 R2 4586845 (Monthly Rollup) 4586823 (Security Only) Critical Remote Code Execution 4580347 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4586845 4586823 Windows Server 2012 R2 (Server Core installation) 4586845 (Monthly Rollup) 4586823 (Security Only) Critical Remote Code Execution 4580347 Base: 9.8 Temporal: 8.5 Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C Yes 4586845 4586823 Windows Server 2016	`4586830 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server 2016 (Server Core installation)	`4586830 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server 2019	`4586793 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server 2019 (Server Core installation)	`4586793 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server, version 1903 (Server Core installation)	`4586786 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server, version 1909 (Server Core installation)	`4586786 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server, version 2004 (Server Core installation)	`4586781 (Security Update)`	Critical	Remote Code Execution	Yes
Windows Server, version 20H2 (Server Core Installation)	`4586781 (Security Update)`	Critical	Remote Code Execution	Yes

Patches

4 patches

Article	Type	Restart
`4586830`	Security Update	Yes
`4586793`	Security Update	Yes
`4586786`	Security Update	Yes
`4586781`	Security Update	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

MSRC Advisory MITRE NVD