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CVE-2020-1243

Windows Hyper-V Denial of Service Vulnerability

HIGH
7.8
CVSS Score
Published: October 16, 2020 at 10:18 PM UTC
Updated: June 17, 2026 at 03:00 AM UTC
13 products affected across 1 vendorWindows Server 2016Windows Server 2019Windows 10

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Severity
HIGH7.8
Exploit prediction
EPSS 0.9%

Description

<p>A denial of service vulnerability exists when Microsoft Hyper-V on a host server fails to properly validate specific malicious data from a user on a guest operating system.</p> <p>To exploit the vulnerability, an attacker who already has a privileged account on a guest operating system, running as a virtual machine, could run a specially crafted application.</p> <p>The security update addresses the vulnerability by resolving the conditions where Hyper-V would fail to handle these requests.</p>

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Windows 10· Microsoft
95%
160717091803180919032004
Windows Server 2016· Microsoft
95%
10.0.0 ≤ v < publication10.0.0190319092004
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows Server 2019· Microsoft
95%
10.0.0 ≤ v < publication10.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows 10 1607· Microsoft
60%
10.0.0 ≤ v < publication10.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows 10 1709· Microsoft
60%
10.0.0 ≤ v < publication10.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows 10 1803· Microsoft
60%
10.0.0 ≤ v < publication10.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows 10 1809· Microsoft
60%
10.0.0 ≤ v < publication10.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows 10 1903· Microsoft
60%
10.0.0 ≤ v < publication10.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows 10 1909· Microsoft
60%
10.0.0 ≤ v < publication10.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement
Windows 10 2004· Microsoft
60%
10.0.0 ≤ v < publication10.0.0
Affected range stops below publication, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (1)

x_refsource_MISCPatchVendor Advisory
Source: [email protected]
https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-1243

CVSS

7.8HIGHmicrosoft
Vector?

Quick Info

StatusMODIFIED
CWE
NVD-CWE-noinfo

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