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CVE-2021-26894— Windows DNS Server Remote Code Execution Vulnerability

Quick assessment

Affected
Microsoft Windows Server 2008 R2 Service Pack 1
Exploitation
High exploitation probability; assess promptly
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Microsoft Windows DNS是美国微软（Microsoft）公司的一个域名解析服务。域名系统（DNS）是包含TCP / IP的行业标准协议套件之一，并且DNS客户端和DNS服务器共同为计算机和用户提供计算机名称到IP地址的映射名称解析服务。 Windows DNS 服务器存在安全漏洞。以下产品和版本受到影响：Windows Server 2019,Windows Server 2019 (Server Core installation),Windows Server, version 19

CVSS 9.8 · Critical EPSS 7.27% · P94

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 15

VendorProduct Version RangeStatus
Microsoft Windows Server 2008 R2 Service Pack 1 6.1.7601.0< 6.1.7601.24566 affected
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0< 6.1.7601.24566 affected
Microsoft Windows Server 2008 Service Pack 2 6.0.6003.0< 6.0.6003.21070 affected
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0< 6.0.6003.21070 affected
Microsoft Windows Server 2012 6.2.9200.0< 6.2.9200.23298 affected
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0< 6.2.9200.23298 affected
Microsoft Windows Server 2012 R2 6.3.9600.0< 6.3.9600.19968 affected
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0< 6.3.9600.19968 affected
Microsoft Windows Server 2016 10.0.14393.0< 10.0.14393.4283 affected
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0< 10.0.14393.4283 affected
Microsoft Windows Server 2019 10.0.17763.0< 10.0.17763.1817 affected
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0< 10.0.17763.1817 affected
Microsoft Windows Server version 2004 10.0.0< 10.0.19043.867 affected
Microsoft Windows Server version 20H2 10.0.0< 10.0.19043.867 affected
Microsoft Windows Server, version 1909 (Server Core installation) 10.0.0< 10.0.18363.1440 affected
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I. Basic Information for CVE-2021-26894

Vulnerability Information
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Vulnerability Title
Windows DNS Server Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
Vulnerability Description
Windows DNS Server Remote Code Execution Vulnerability
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Microsoft Windows DNS 服务器安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Microsoft Windows DNS是美国微软（Microsoft）公司的一个域名解析服务。域名系统（DNS）是包含TCP / IP的行业标准协议套件之一，并且DNS客户端和DNS服务器共同为计算机和用户提供计算机名称到IP地址的映射名称解析服务。 Windows DNS 服务器存在安全漏洞。以下产品和版本受到影响：Windows Server 2019,Windows Server 2019 (Server Core installation),Windows Server, version 19
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 2008 R2 Service Pack 1 6.1.7601.0 ~ 6.1.7601.24566 -
Microsoft Windows Server 2008 R2 Service Pack 1 (Server Core installation) 6.1.7601.0 ~ 6.1.7601.24566 -
Microsoft Windows Server 2008 Service Pack 2 6.0.6003.0 ~ 6.0.6003.21070 -
Microsoft Windows Server 2008 Service Pack 2 (Server Core installation) 6.0.6003.0 ~ 6.0.6003.21070 -
Microsoft Windows Server 2012 6.2.9200.0 ~ 6.2.9200.23298 -
Microsoft Windows Server 2012 (Server Core installation) 6.2.9200.0 ~ 6.2.9200.23298 -
Microsoft Windows Server 2012 R2 6.3.9600.0 ~ 6.3.9600.19968 -
Microsoft Windows Server 2012 R2 (Server Core installation) 6.3.9600.0 ~ 6.3.9600.19968 -
Microsoft Windows Server 2016 10.0.14393.0 ~ 10.0.14393.4283 -
Microsoft Windows Server 2016 (Server Core installation) 10.0.14393.0 ~ 10.0.14393.4283 -
Microsoft Windows Server 2019 10.0.17763.0 ~ 10.0.17763.1817 -
Microsoft Windows Server 2019 (Server Core installation) 10.0.17763.0 ~ 10.0.17763.1817 -
Microsoft Windows Server version 2004 10.0.0 ~ 10.0.19043.867 -
Microsoft Windows Server version 20H2 10.0.0 ~ 10.0.19043.867 -
Microsoft Windows Server, version 1909 (Server Core installation) 10.0.0 ~ 10.0.18363.1440 -

II. Public POCs for CVE-2021-26894

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III. Intelligence Information for CVE-2021-26894

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Vendor Advisories for CVE-2021-26894 (2)

Same Patch Batch · Microsoft · 2021-03-11 · 80 CVEs total

CVE-2021-26867 9.9 CRITICAL Windows Hyper-V Remote Code Execution Vulnerability
CVE-2021-26897 9.8 CRITICAL Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-26895 9.8 CRITICAL Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-26893 9.8 CRITICAL Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-26877 9.8 CRITICAL Windows DNS Server Remote Code Execution Vulnerability
CVE-2021-27080 9.3 CRITICAL Azure Sphere Unsigned Code Execution Vulnerability
CVE-2021-27085 8.8 HIGH Internet Explorer Remote Code Execution Vulnerability
CVE-2021-26876 8.8 HIGH OpenType Font Parsing Remote Code Execution Vulnerability
CVE-2021-26865 8.8 HIGH Windows Container Execution Agent Elevation of Privilege Vulnerability
CVE-2021-27076 8.8 HIGH Microsoft SharePoint Server Remote Code Execution Vulnerability
CVE-2021-26411 8.8 HIGH Internet Explorer Memory Corruption Vulnerability
CVE-2021-26864 8.4 HIGH Windows Virtual Registry Provider Elevation of Privilege Vulnerability
CVE-2021-24089 7.8 HIGH HEVC Video Extensions Remote Code Execution Vulnerability
CVE-2021-26891 7.8 HIGH Windows Container Execution Agent Elevation of Privilege Vulnerability
CVE-2021-24090 7.8 HIGH Windows Error Reporting Elevation of Privilege Vulnerability
CVE-2021-26887 7.8 HIGH Microsoft Windows Folder Redirection Elevation of Privilege Vulnerability
CVE-2021-26885 7.8 HIGH Windows WalletService Elevation of Privilege Vulnerability
CVE-2021-26882 7.8 HIGH Remote Access API Elevation of Privilege Vulnerability
CVE-2021-26880 7.8 HIGH Windows Storage Spaces Controller Elevation of Privilege Vulnerability
CVE-2021-26889 7.8 HIGH Windows Update Stack Elevation of Privilege Vulnerability

Showing top 20 of 80 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Windows Server 2008 R2 Service Pack 1
Same vendor: Microsoft

V. Comments for CVE-2021-26894

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