OnlyPatch
Role: Windows Hyper-V

CVE-2021-24076 — Microsoft Windows VMSwitch Information Disclosure Vulnerability

Important CVSS 5.5 EPSS 0.00888 2021-03 archive

Executive Summary

None

Overview

5.5
CVSS MEDIUM
Important
MS Severity
Not Exploited
MS Exploit Status
Less Likely
MS Exploit Likelihood
Category Information Disclosure
Released Mar 9 2021
Last Updated Mar 9 2021
Publicly Disclosed No
CISA KEV Not Listed
Known Exploits None Known
EPSS Score 0.00888 — 0.55613 percentile
NVD CVSS 5.5 MEDIUM — matches MSRC

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C
ATTACK VECTOR
Local
ATTACK COMPLEXITY
Low
PRIVILEGES REQUIRED
Low
USER INTERACTION
None
SCOPE
Unchanged
CONFIDENTIALITY
High
INTEGRITY
None
AVAILABILITY
None
EXPLOIT CODE MATURITY
Proof-of-Concept
REMEDIATION LEVEL
Official Fix
REPORT CONFIDENCE
Confirmed
Temporal Score: 5.0

EPSS Score

0.00888
probability of exploitation in the next 30 days
0.55613 percentile - updated 2026-07-25
View on FIRST.org

Affected Products

13 affected products
Product KB Article Severity Impact Restart Required
Windows 10 for x64-based Systems 4601331 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1607 for x64-based Systems 4601318 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1803 for x64-based Systems 4601354 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1809 for x64-based Systems 4601345 (Security Update) Important Information Disclosure Yes
Windows 10 Version 1909 for x64-based Systems 4601315 (Security Update) Important Information Disclosure Yes
Windows 10 Version 2004 for x64-based Systems 4601319 (Security Update) Important Information Disclosure Yes
Windows 8.1 for x64-based systems 4601384 (Monthly Rollup) 4601349 (Security Only) Important Information Disclosure 4598285 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes 4601384 4601349 Windows Server 2012 4601348 (Monthly Rollup) 4601357 (Security Only) Important Information Disclosure 4598278 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes 4601348 4601357 Windows Server 2012 (Server Core installation) 4601348 (Monthly Rollup) 4601357 (Security Only) Important Information Disclosure 4598278 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes 4601348 4601357 Windows Server 2012 R2 4601384 (Monthly Rollup) 4601349 (Security Only) Important Information Disclosure 4598285 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes 4601384 4601349 Windows Server 2012 R2 (Server Core installation) 4601384 (Monthly Rollup) 4601349 (Security Only) Important Information Disclosure 4598285 Base: 5.5 Temporal: 5.0 Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:P/RL:O/RC:C Yes 4601384 4601349 Windows Server 2016 4601318 (Security Update) Important Information Disclosure Yes
Windows Server 2016 (Server Core installation) 4601318 (Security Update) Important Information Disclosure Yes
Windows Server 2019 4601345 (Security Update) Important Information Disclosure Yes
Windows Server 2019 (Server Core installation) 4601345 (Security Update) Important Information Disclosure Yes
Windows Server, version 1909 (Server Core installation) 4601315 (Security Update) Important Information Disclosure Yes
Windows Server, version 2004 (Server Core installation) 4601319 (Security Update) Important Information Disclosure Yes
Windows Server, version 20H2 (Server Core Installation) 4601319 (Security Update) Important Information Disclosure Yes

Patches

6 patches
Article Type Restart
4601331 Security Update Yes
4601318 Security Update Yes
4601354 Security Update Yes
4601345 Security Update Yes
4601315 Security Update Yes
4601319 Security Update Yes

Known Exploits

Acknowledgments

Microsoft Platform Security & Vulnerability Research

On This Page