CVE-2021-24075Network attack vector

Remote authenticated interruption of VMSwitch host availability

Published Feb 25, 2021 · Updated Aug 3, 2024

Denial of service in Microsoft Windows VMSwitch allows remote authenticated users to interrupt affected Windows 10 and Server hosts. Microsoft has not published the vulnerable VMSwitch operation or the untrusted input that triggers the interruption. Exploitation requires low privileges and user interaction and affects availability only; the record does not specify whether the host crashes or hangs.

CVSS severity6.8
Medium
EPSS probability2.52%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in Microsoft Windows VMSwitch allows remote authenticated users to interrupt affected Windows 10 and Server hosts. Microsoft has not published the vulnerable VMSwitch operation or the untrusted input that triggers the interruption. Exploitation requires low privileges and user interaction and affects availability only; the record does not specify whether the host crashes or hangs.

The record

CVE
CVE-2021-24075
Published
Feb 25, 2021
Updated
Aug 3, 2024
Vendor
Microsoft
Product
Windows Server, version 2004
Classifications
T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 25, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=10.0.0 <publication

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Microsoft · Windows Server, version 2004version=10.0.0 <publication
Microsoft · Windows 10 Version 20H2version=10.0.0 <publication
Microsoft · Windows Server version 20H2version=10.0.0 <publication
Microsoft · Windows 10 Version 2004version=10.0.0 <publication

Published CVSS scores

6.8MicrosoftCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:N/I:N/A:H
3.5NVDAV:N/AC:M/Au:S/C:N/I:N/A:P

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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