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CVE-2020-17049— Kerberos KDC Security Feature Bypass Vulnerability

Quick assessment

Affected

Microsoft Windows Server 2019

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 Kerberos for Windows是美国微软（Microsoft）公司的一个用于在网络集群中进行身份验证的软件。Kerberos 同时作为一种网络认证协议，其设计目标是通过密钥系统为客户机/服务器应用程序提供强大的认证服务。多款 Microsoft 产品存在权限许可和访问控制问题漏洞,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 20H2 (Server Core Installation),W

CVSS 6.6 · Medium EPSS 13.69% · P96 Updated Feb 24, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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I. Basic Information for CVE-2020-17049

Vulnerability Information

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Vulnerability Title

Kerberos KDC Security Feature Bypass Vulnerability

Source: CVE Program / CVE List V5

Vulnerability Description

A security feature bypass vulnerability exists in the way Key Distribution Center (KDC) determines if a service ticket can be used for delegation via Kerberos Constrained Delegation (KCD). To exploit the vulnerability, a compromised service that is configured to use KCD could tamper with a service ticket that is not valid for delegation to force the KDC to accept it. The update addresses this vulnerability by changing how the KDC validates service tickets used with KCD.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:H/PR:H/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 Kerberos 权限许可和访问控制问题漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

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
Microsoft	Windows Server 2019	10.0.0 ~ 10.0.17763.2061	`cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2061:::::::*`
Microsoft	Windows Server 2019 (Server Core installation)	10.0.0 ~ 10.0.17763.2061	`cpe:2.3:o:microsoft:windows_server_2019:10.0.17763.2061:::::::*`
Microsoft	Windows Server, version 1909 (Server Core installation)	10.0.0 ~ publication	`cpe:2.3:o:microsoft:windows_server_1909::::::::`
Microsoft	Windows Server, version 1903 (Server Core installation)	10.0.0 ~ publication	`cpe:2.3:o:microsoft:windows_server_1903::::::::`
Microsoft	Windows Server version 2004	10.0.0 ~ 10.0.19041.1110	`cpe:2.3:o:microsoft:windows_server_2004:10.0.19041.1110:::::::*`
Microsoft	Windows Server 2016	10.0.0 ~ 10.0.14393.4530	`cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4530:::::::*`
Microsoft	Windows Server 2016 (Server Core installation)	10.0.0 ~ 10.0.14393.4530	`cpe:2.3:o:microsoft:windows_server_2016:10.0.14393.4530:::::::*`
Microsoft	Windows Server 2008 Service Pack 2	6.0.0 ~ 6.0.6003.21167	`cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21167::::::x64:`
Microsoft	Windows Server 2008 Service Pack 2 (Server Core installation)	6.0.0 ~ 6.0.6003.21167	`cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21167::::::x64:`
Microsoft	Windows Server 2008 Service Pack 2	6.0.0 ~ 6.0.6003.21167	`cpe:2.3:o:microsoft:windows_server_2008_sp2:6.0.6003.21167::::::x86:`
Microsoft	Windows Server 2008 R2 Service Pack 1	6.1.0 ~ 6.1.7601.25661	`cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25661::::::x64:`
Microsoft	Windows Server 2008 R2 Service Pack 1 (Server Core installation)	6.0.0 ~ 6.1.7601.25661	`cpe:2.3:o:microsoft:windows_server_2008_R2:6.1.7601.25661::::::x64:`
Microsoft	Windows Server 2012	6.2.0 ~ 6.2.9200.23409	`cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23409::::::x64:`
Microsoft	Windows Server 2012 (Server Core installation)	6.2.0 ~ 6.2.9200.23409	`cpe:2.3:o:microsoft:windows_server_2012:6.2.9200.23409::::::x64:`
Microsoft	Windows Server 2012 R2	6.3.0 ~ 6.3.9600.20069	`cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20069::::::x64:`
Microsoft	Windows Server 2012 R2 (Server Core installation)	6.3.0 ~ 6.3.9600.20069	`cpe:2.3:o:microsoft:windows_server_2012_R2:6.3.9600.20069::::::x64:`
Microsoft	Windows Server version 20H2	10.0.0 ~ 10.0.19041.1110	`cpe:2.3:o:microsoft:windows_server_20H2:10.0.19041.1110:::::::*`

II. Public POCs for CVE-2020-17049

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2020-17049

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Vendor Advisories for CVE-2020-17049 (2)

Mailing List Discussions for CVE-2020-17049 (1)

http://www.openwall.com/lists/oss-security/2021/11/10/3 mailing-list

https://www.cve.org/CVERecord?id=CVE-2020-17049

Same Patch Batch · Microsoft · 2020-11-11 · 112 CVEs total

CVE-2020-17051	9.8 CRITICAL	Windows Network File System Remote Code Execution Vulnerability
CVE-2020-17061	8.8 HIGH	Microsoft SharePoint Remote Code Execution Vulnerability
CVE-2020-17042	8.8 HIGH	Windows Print Spooler Remote Code Execution Vulnerability
CVE-2020-17084	8.5 HIGH	Microsoft Exchange Server Remote Code Execution Vulnerability
CVE-2020-16970	8.1 HIGH	Azure Sphere Unsigned Code Execution Vulnerability
CVE-2020-17016	8.0 HIGH	Microsoft SharePoint Server Spoofing Vulnerability
CVE-2020-17067	7.8 HIGH	Microsoft Excel Security Feature Bypass Vulnerability
CVE-2020-17043	7.8 HIGH	Windows Remote Access Elevation of Privilege Vulnerability
CVE-2020-17068	7.8 HIGH	Windows GDI+ Remote Code Execution Vulnerability
CVE-2020-17064	7.8 HIGH	Microsoft Excel Remote Code Execution Vulnerability
CVE-2020-17065	7.8 HIGH	Microsoft Excel Remote Code Execution Vulnerability
CVE-2020-17062	7.8 HIGH	Microsoft Office Access Connectivity Engine Remote Code Execution Vulnerability
CVE-2020-17055	7.8 HIGH	Windows Remote Access Elevation of Privilege Vulnerability
CVE-2020-17044	7.8 HIGH	Windows Remote Access Elevation of Privilege Vulnerability
CVE-2020-17041	7.8 HIGH	Windows Print Configuration Elevation of Privilege Vulnerability
CVE-2020-17037	7.8 HIGH	Windows WalletService Elevation of Privilege Vulnerability
CVE-2020-17038	7.8 HIGH	Win32k Elevation of Privilege Vulnerability
CVE-2020-17035	7.8 HIGH	Windows Kernel Elevation of Privilege Vulnerability
CVE-2020-17019	7.8 HIGH	Microsoft Excel Remote Code Execution Vulnerability
CVE-2020-17014	7.8 HIGH	Windows Print Spooler Elevation of Privilege Vulnerability

Showing top 20 of 112 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Windows Server 2019

Same vendor: Microsoft

V. Comments for CVE-2020-17049

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Goal Reached Thanks to every supporter — we hit 100%!

CVE-2020-17049— Kerberos KDC Security Feature Bypass Vulnerability

Quick assessment

Possible ATT&CK Techniques 1 AI

I. Basic Information for CVE-2020-17049

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2020-17049

III. Intelligence Information for CVE-2020-17049

Vendor Advisories for CVE-2020-17049 (2)

Mailing List Discussions for CVE-2020-17049 (1)

Same Patch Batch · Microsoft · 2020-11-11 · 112 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2020-17049

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