CVE-2021-1691— Windows Hyper-V Denial of Service Vulnerability
Quick assessment
Affected
Microsoft Windows Server version 20H2
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
Microsoft Windows Hyper-V是美国微软（Microsoft）公司的一款可提供硬件虚拟化的工具。该软件允许创建虚拟硬盘驱动器、虚拟交换机以及许多其他虚拟设备。 Hyper-V 拒绝服务漏洞,目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。以下产品及版本受到影响:Windows Server, version 2004 (Server Core installation),Windows 10 Version 2004 for x64-based Systems,Windows
Possible ATT&CK Techniques 1 AI
T1499 · Endpoint Denial of Service
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I. Basic Information for CVE-2021-1691
Vulnerability Information
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Vulnerability Title
Windows Hyper-V Denial of Service Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Windows Hyper-V Denial of Service Vulnerability
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows Hyper-V 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows Hyper-V是美国微软（Microsoft）公司的一款可提供硬件虚拟化的工具。该软件允许创建虚拟硬盘驱动器、虚拟交换机以及许多其他虚拟设备。 Hyper-V 拒绝服务漏洞,目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。以下产品及版本受到影响:Windows Server, version 2004 (Server Core installation),Windows 10 Version 2004 for x64-based Systems,Windows
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Microsoft | Windows Server version 20H2 | 10.0.0 ~ publication |
cpe:2.3:o:microsoft:windows_server_20H2:*:*:*:*:*:*:*:*
|
|
| Microsoft | Windows 10 Version 1909 | 10.0.0 ~ publication |
cpe:2.3:o:microsoft:windows_10_1909:*:*:*:*:*:*:x64:*
|
|
| Microsoft | Windows Server, version 1909 (Server Core installation) | 10.0.0 ~ publication |
cpe:2.3:o:microsoft:windows_server_1909:*:*:*:*:*:*:*:*
|
|
| Microsoft | Windows 10 Version 2004 | 10.0.0 ~ publication |
cpe:2.3:o:microsoft:windows_10_1809:*:*:*:*:*:*:x64:*
|
|
| Microsoft | Windows Server version 2004 | 10.0.0 ~ publication |
cpe:2.3:o:microsoft:windows_server_2004:*:*:*:*:*:*:*:*
|
|
II. Public POCs for CVE-2021-1691
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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Vendor Advisories for CVE-2021-1691 (1)
Same Patch Batch · Microsoft · 2021-01-12 · 82 CVEs total
| CVE-2021-1707 | 8.8 HIGH | Microsoft SharePoint Server Remote Code Execution Vulnerability |
| CVE-2021-1658 | 8.8 HIGH | Remote Procedure Call Runtime Remote Code Execution Vulnerability |
| CVE-2021-1660 | 8.8 HIGH | Remote Procedure Call Runtime Remote Code Execution Vulnerability |
| CVE-2021-1664 | 8.8 HIGH | Remote Procedure Call Runtime Remote Code Execution Vulnerability |
| CVE-2021-1666 | 8.8 HIGH | Remote Procedure Call Runtime Remote Code Execution Vulnerability |
| CVE-2021-1667 | 8.8 HIGH | Remote Procedure Call Runtime Remote Code Execution Vulnerability |
| CVE-2021-1669 | 8.8 HIGH | Windows Remote Desktop Security Feature Bypass Vulnerability |
| CVE-2021-1671 | 8.8 HIGH | Remote Procedure Call Runtime Remote Code Execution Vulnerability |
| CVE-2021-1673 | 8.8 HIGH | Remote Procedure Call Runtime Remote Code Execution Vulnerability |
| CVE-2021-1674 | 8.8 HIGH | Windows Remote Desktop Protocol Core Security Feature Bypass Vulnerability |
| CVE-2021-1678 | 8.8 HIGH | Windows Print Spooler Spoofing Vulnerability |
| CVE-2021-1700 | 8.8 HIGH | Remote Procedure Call Runtime Remote Code Execution Vulnerability |
| CVE-2021-1701 | 8.8 HIGH | Remote Procedure Call Runtime Remote Code Execution Vulnerability |
| CVE-2021-1636 | 8.8 HIGH | Microsoft SQL Elevation of Privilege Vulnerability |
| CVE-2021-1719 | 8.0 HIGH | Microsoft SharePoint Elevation of Privilege Vulnerability |
| CVE-2021-1712 | 8.0 HIGH | Microsoft SharePoint Elevation of Privilege Vulnerability |
| CVE-2021-1718 | 8.0 HIGH | Microsoft SharePoint Server Tampering Vulnerability |
| CVE-2021-1703 | 7.8 HIGH | Windows Event Logging Service Elevation of Privilege Vulnerability |
| CVE-2021-1681 | 7.8 HIGH | Windows WalletService Elevation of Privilege Vulnerability |
| CVE-2021-1711 | 7.8 HIGH | Microsoft Office Remote Code Execution Vulnerability |
Showing top 20 of 82 CVEs. View all on vendor page → →
IV. Related Vulnerabilities
Same product: Windows Server version 20H2
-
CVE-2021-24088
Windows Local Spooler Remote Code Execution Vulnerability -
CVE-2021-1704
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CVE-2021-1645
Windows Docker Information Disclosure Vulnerability -
CVE-2020-17088
Windows Common Log File System Driver Elevation of Privilege
Same vendor: Microsoft
-
CVE-2026-96940
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CVE-2026-70125
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CVE-2026-88097
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M365 Copilot Information Disclosure Vulnerability
V. Comments for CVE-2021-1691
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