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Windows Hyper-V

CVE-2020-0909 — Windows Hyper-V Denial of Service Vulnerability

Important CVSS 7.5 EPSS 0.04442 2020-05 archive

Executive Summary

A denial of service vulnerability exists when Hyper-V on a Windows Server fails to properly handle specially crafted network packets. To exploit the vulnerability, an attacker would send specially crafted network packets to the Hyper-V Server. The security update addresses the vulnerability by resolving the conditions where Hyper-V would fail to properly handle these network packets.

Overview

7.5
CVSS HIGH
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Denial of Service
Released May 12 2020
Last Updated May 12 2020
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.04442 — 0.90157 percentile
NVD CVSS 7.5 HIGH — matches MSRC

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

0.04442
probability of exploitation in the next 30 days
0.90157 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

14 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for x64-based Systems 4556826 (Security Update) Important Denial of Service Yes
Windows 10 Version 1607 for x64-based Systems 4556813 (Security Update) Important Denial of Service Yes
Windows 10 Version 1709 for x64-based Systems 4556812 (Security Update) Important Denial of Service Yes
Windows 10 Version 1803 for x64-based Systems 4556807 (Security Update) Important Denial of Service Yes
Windows 10 Version 1809 for x64-based Systems 4551853 (Security Update) Important Denial of Service Yes
Windows 10 Version 1903 for x64-based Systems 4556799 (Security Update) Important Denial of Service Yes
Windows 10 Version 1909 for x64-based Systems 4556799 (Security Update) Important Denial of Service Yes
Windows 7 for x64-based Systems Service Pack 1 4556836 (Monthly Rollup) 4556843 (Security Only) Important Denial of Service 4550964 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4556836 4556843 Windows 8.1 for x64-based systems 4556846 (Monthly Rollup) 4556853 (Security Only) Important Denial of Service 4550961 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows Server 2008 for x64-based Systems Service Pack 2 4556860 (Monthly Rollup) 4556854 (Security Only) Important Denial of Service 4550951 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4556860 4556854 Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 4556860 (Monthly Rollup) 4556854 (Security Only) Important Denial of Service 4550951 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4556860 4556854 Windows Server 2008 R2 for x64-based Systems Service Pack 1 4556836 (Monthly Rollup) 4556843 (Security Only) Important Denial of Service 4550964 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4556836 4556843 Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 4556836 (Monthly Rollup) 4556843 (Security Only) Important Denial of Service 4550964 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes 4556836 4556843 Windows Server 2012 4556840 (Monthly Rollup) 4556852 (Security Only) Important Denial of Service 4550917 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 (Server Core installation) 4556840 (Monthly Rollup) 4556852 (Security Only) Important Denial of Service 4550917 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 4556846 (Monthly Rollup) 4556853 (Security Only) Important Denial of Service 4550961 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows Server 2012 R2 (Server Core installation) 4556846 (Monthly Rollup) 4556853 (Security Only) Important Denial of Service 4550961 Base: 7.5 Temporal: 6.7 Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:P/RL:O/RC:C Yes None Windows Server 2016 4556813 (Security Update) Important Denial of Service Yes
Windows Server 2016 (Server Core installation) 4556813 (Security Update) Important Denial of Service Yes
Windows Server 2019 4551853 (Security Update) Important Denial of Service Yes
Windows Server 2019 (Server Core installation) 4551853 (Security Update) Important Denial of Service Yes
Windows Server, version 1803 (Server Core Installation) 4556807 (Security Update) Important Denial of Service Yes
Windows Server, version 1903 (Server Core installation) 4556799 (Security Update) Important Denial of Service Yes
Windows Server, version 1909 (Server Core installation) 4556799 (Security Update) Important Denial of Service Yes

Patches

6 patches
Article Type Restart
4556826 Security Update Yes
4556813 Security Update Yes
4556812 Security Update Yes
4556807 Security Update Yes
4551853 Security Update Yes
4556799 Security Update Yes

Known Exploits

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