OnlyFm252
Role: Windows Hyper-V

CVE-2021-42284 — Windows Hyper-V Denial of Service Vulnerability

Important CVSS 6.8 EPSS 0.03387 2021-11 archive

Executive Summary

None

Overview

6.8
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Denial of Service
Released Nov 9 2021
Last Updated Nov 9 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.03387 — 0.87243 percentile
NVD CVSS 6.8 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C
ATTACK VECTOR
Adjacent_network
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Changed
CONFIDENTIALITY
None
INTEGRITY
None
AVAILABILITY
High
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 6.1

EPSS Score

0.03387
probability of exploitation in the next 30 days
0.87243 percentile - updated 2026-06-21
View on FIRST.org

Affected Products

15 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for x64-based Systems 5007207 (Security Update) Important Denial of Service Yes
Windows 10 Version 1607 for x64-based Systems 5007192 (Security Update) Important Denial of Service Yes
Windows 10 Version 1809 for x64-based Systems 5007206 (Security Update) Important Denial of Service Yes
Windows 10 Version 1909 for x64-based Systems 5007189 (Security Update) Important Denial of Service Yes
Windows 10 Version 2004 for x64-based Systems 5007186 (Security Update) Important Denial of Service Yes
Windows 10 Version 21H1 for x64-based Systems 5007186 (Security Update) Important Denial of Service Yes
Windows 11 version 21H2 for x64-based Systems 5007215 (Security Update) Important Denial of Service Yes
Windows 8.1 for x64-based systems 5007247 (Monthly Rollup) 5007255 (Security Only) Important Denial of Service 5006714 Base: 6.8 Temporal: 6.1 Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C 6.3.9600.20174 Yes 5007247 5007255 Windows Server 2012 R2 5007247 (Monthly Rollup) 5007255 (Security Only) Important Denial of Service 5006714 Base: 6.8 Temporal: 6.1 Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C 6.3.9600.20174 Yes 5007247 5007255 Windows Server 2012 R2 (Server Core installation) 5007247 (Monthly Rollup) 5007255 (Security Only) Important Denial of Service 5006714 Base: 6.8 Temporal: 6.1 Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H/E:P/RL:O/RC:C 6.3.9600.20174 Yes 5007247 5007255 Windows Server 2016 5007192 (Security Update) Important Denial of Service Yes
Windows Server 2016 (Server Core installation) 5007192 (Security Update) Important Denial of Service Yes
Windows Server 2019 5007206 (Security Update) Important Denial of Service Yes
Windows Server 2019 (Server Core installation) 5007206 (Security Update) Important Denial of Service Yes
Windows Server 2022 5007205 (Security Update) Important Denial of Service Yes
Windows Server 2022 (Server Core installation) 5007205 (Security Update) Important Denial of Service Yes
Windows Server, version 2004 (Server Core installation) 5007186 (Security Update) Important Denial of Service Yes
Windows Server, version 20H2 (Server Core Installation) 5007186 (Security Update) Important Denial of Service Yes

Patches

7 patches
Article Type Restart
5007207 Security Update Yes
5007192 Security Update Yes
5007206 Security Update Yes
5007189 Security Update Yes
5007186 Security Update Yes
5007215 Security Update Yes
5007205 Security Update Yes

Known Exploits

Acknowledgments

Microsoft Offensive Research & Security Engineering (MORSE)

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