CVE-2020-17049

CVE.org · Published

Record status: Published
Identifier year (not publication year): 2020
Source publication: Nov 11, 2020
Source updated: Nov 15, 2024
Imported by cveboard: Oct 24, 2026
Source snapshot: cve_2026-10-24_midnight_baseline · Oct 24, 2026

CNA source text (English)

Kerberos KDC Security Feature Bypass Vulnerability

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.

Scoped product and version facts

Fix information unknown; no fixed version is derived here. Missing information does not prove that no fix exists.

Exploitation unknown; this catalogue does not assess exploitation.

Windows Server 2019

Vendor: Microsoft
Product: Windows Server 2019
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2019 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.0	`affected`	custom	10.0.17763.2061	Unavailable	None listed

Windows Server 2019 (Server Core installation)

Vendor: Microsoft
Product: Windows Server 2019 (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2019 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.0	`affected`	custom	10.0.17763.2061	Unavailable	None listed

Windows Server, version 1909 (Server Core installation)

Vendor: Microsoft
Product: Windows Server, version 1909 (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server, version 1909 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.0	`affected`	custom	publication	Unavailable	None listed

Windows Server, version 1903 (Server Core installation)

Vendor: Microsoft
Product: Windows Server, version 1903 (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server, version 1903 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.0	`affected`	custom	publication	Unavailable	None listed

Windows Server version 2004

Vendor: Microsoft
Product: Windows Server version 2004
Platforms: x64-based Systems
Default status: Unknown

Windows Server version 2004 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.0	`affected`	custom	10.0.19041.1110	Unavailable	None listed

Windows Server 2016

Vendor: Microsoft
Product: Windows Server 2016
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2016 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.0	`affected`	custom	10.0.14393.4530	Unavailable	None listed

Windows Server 2016 (Server Core installation)

Vendor: Microsoft
Product: Windows Server 2016 (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2016 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.0	`affected`	custom	10.0.14393.4530	Unavailable	None listed

Windows Server 2008 Service Pack 2

Vendor: Microsoft
Product: Windows Server 2008 Service Pack 2
Platforms: 32-bit Systems
Default status: Unknown

Windows Server 2008 Service Pack 2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.0.0	`affected`	custom	6.0.6003.21167	Unavailable	None listed

Windows Server 2008 Service Pack 2 (Server Core installation)

Vendor: Microsoft
Product: Windows Server 2008 Service Pack 2 (Server Core installation)
Platforms: 32-bit Systems
x64-based Systems
Default status: Unknown

Windows Server 2008 Service Pack 2 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.0.0	`affected`	custom	6.0.6003.21167	Unavailable	None listed

Windows Server 2008 Service Pack 2

Vendor: Microsoft
Product: Windows Server 2008 Service Pack 2
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2008 Service Pack 2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.0.0	`affected`	custom	6.0.6003.21167	Unavailable	None listed

Windows Server 2008 R2 Service Pack 1

Vendor: Microsoft
Product: Windows Server 2008 R2 Service Pack 1
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2008 R2 Service Pack 1 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.1.0	`affected`	custom	6.1.7601.25661	Unavailable	None listed

Windows Server 2008 R2 Service Pack 1 (Server Core installation)

Vendor: Microsoft
Product: Windows Server 2008 R2 Service Pack 1 (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2008 R2 Service Pack 1 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.0.0	`affected`	custom	6.1.7601.25661	Unavailable	None listed

Windows Server 2012

Vendor: Microsoft
Product: Windows Server 2012
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2012 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.2.0	`affected`	custom	6.2.9200.23409	Unavailable	None listed

Windows Server 2012 (Server Core installation)

Vendor: Microsoft
Product: Windows Server 2012 (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2012 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.2.0	`affected`	custom	6.2.9200.23409	Unavailable	None listed

Windows Server 2012 R2

Vendor: Microsoft
Product: Windows Server 2012 R2
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2012 R2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.3.0	`affected`	custom	6.3.9600.20069	Unavailable	None listed

Windows Server 2012 R2 (Server Core installation)

Vendor: Microsoft
Product: Windows Server 2012 R2 (Server Core installation)
Platforms: x64-based Systems
Default status: Unknown

Windows Server 2012 R2 (Server Core installation) · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
6.3.0	`affected`	custom	6.3.9600.20069	Unavailable	None listed

Windows Server version 20H2

Vendor: Microsoft
Product: Windows Server version 20H2
Platforms: x64-based Systems
Default status: Unknown

Windows Server version 20H2 · Scoped product and version facts
Version (version)	Status (status)	Version scheme (versionType)	Exclusive end (lessThan)	Inclusive end (lessThanOrEqual)	Status changes (at → status)
10.0.0	`affected`	custom	10.0.19041.1110	Unavailable	None listed