{
    "data_version": "4.0",
    "data_type": "CVE",
    "data_format": "MITRE",
    "CVE_data_meta": {
        "ID": "CVE-2020-17049",
        "ASSIGNER": "secure@microsoft.com",
        "STATE": "PUBLIC"
    },
    "description": {
        "description_data": [
            {
                "lang": "eng",
                "value": "<p>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).</p>\n<p>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.</p>\n<p>The update addresses this vulnerability by changing how the KDC validates service tickets used with KCD.</p>\n"
            }
        ]
    },
    "problemtype": {
        "problemtype_data": [
            {
                "description": [
                    {
                        "lang": "eng",
                        "value": "Security Feature Bypass"
                    }
                ]
            }
        ]
    },
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                    "product": {
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                                "product_name": "Windows Server, version 1909 (Server Core installation)",
                                "version": {
                                    "version_data": [
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                            {
                                "product_name": "Windows Server, version 1903 (Server Core installation)",
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                                "version": {
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                                            "version_affected": "<",
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                            {
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                                "version": {
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                                            "version_affected": "<",
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                                            "version_affected": "<",
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                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "6.0.0",
                                            "version_value": "6.0.6003.21167"
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                                }
                            },
                            {
                                "product_name": "Windows Server 2008  Service Pack 2",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "6.0.0",
                                            "version_value": "6.0.6003.21167"
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                                }
                            },
                            {
                                "product_name": "Windows Server 2008 R2 Service Pack 1",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "6.1.0",
                                            "version_value": "6.1.7601.25661"
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                                }
                            },
                            {
                                "product_name": "Windows Server 2008 R2 Service Pack 1 (Server Core installation)",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
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                            {
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                                "version": {
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                            },
                            {
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                                "version": {
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                                        {
                                            "version_affected": "<",
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                                            "version_value": "6.2.9200.23409"
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                                }
                            },
                            {
                                "product_name": "Windows Server 2012 R2",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "6.3.0",
                                            "version_value": "6.3.9600.20069"
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                                }
                            },
                            {
                                "product_name": "Windows Server 2012 R2 (Server Core installation)",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "6.3.0",
                                            "version_value": "6.3.9600.20069"
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                                    ]
                                }
                            },
                            {
                                "product_name": "Windows Server version 20H2",
                                "version": {
                                    "version_data": [
                                        {
                                            "version_affected": "<",
                                            "version_name": "10.0.0",
                                            "version_value": "10.0.19041.1110"
                                        }
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                                }
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                }
            ]
        }
    },
    "references": {
        "reference_data": [
            {
                "url": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17049",
                "refsource": "MISC",
                "name": "https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17049"
            },
            {
                "url": "http://www.openwall.com/lists/oss-security/2021/11/10/3",
                "refsource": "MISC",
                "name": "http://www.openwall.com/lists/oss-security/2021/11/10/3"
            },
            {
                "url": "https://security.gentoo.org/glsa/202309-06",
                "refsource": "MISC",
                "name": "https://security.gentoo.org/glsa/202309-06"
            }
        ]
    },
    "impact": {
        "cvss": [
            {
                "version": "3.1",
                "baseSeverity": "MEDIUM",
                "baseScore": 6.6,
                "vectorString": "CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C"
            }
        ]
    }
}