FKIE_CVE-2020-17049

Vulnerability from fkie_nvd - Published: 2020-11-11 07:15 - Updated: 2026-06-17 02:58
Severity
6.6 (Medium) - CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H
7.2 (High) - CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
secure@microsoft.comhttp://www.openwall.com/lists/oss-security/2021/11/10/3Mailing List, Third Party Advisory
secure@microsoft.comhttps://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17049Patch, Vendor Advisory
secure@microsoft.comhttps://security.gentoo.org/glsa/202309-06
af854a3a-2127-422b-91ae-364da2661108http://www.openwall.com/lists/oss-security/2021/11/10/3Mailing List, Third Party Advisory
af854a3a-2127-422b-91ae-364da2661108https://portal.msrc.microsoft.com/en-US/security-guidance/advisory/CVE-2020-17049Patch, Vendor Advisory
af854a3a-2127-422b-91ae-364da2661108https://security.gentoo.org/glsa/202309-06
Impacted products
Vendor Product Version
microsoft windows_server_2012 *
microsoft windows_server_2012 r2
microsoft windows_server_2016 -
microsoft windows_server_2016 20h2
microsoft windows_server_2016 1903
microsoft windows_server_2016 1909
microsoft windows_server_2016 2004
microsoft windows_server_2019 -
samba samba *
samba samba *
samba samba *
To clipboard 

{
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    },
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      "value": "Vulnerabilidad de Omisi\u00f3n de la Caracter\u00edstica de Seguridad de Kerberos"
    }
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  "lastModified": "2026-06-17T02:58:34.727",
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        "baseSeverity": "HIGH",
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          "authentication": "SINGLE",
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          "baseScore": 9.0,
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        "obtainAllPrivilege": false,
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          "confidentialityImpact": "HIGH",
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    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2020-17049",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "total"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-11-15T16:12:34.390288Z",
          "version": "2.0.3"
        }
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  },
  "published": "2020-11-11T07:15:16.543",
  "references": [
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      "source": "secure@microsoft.com",
      "tags": [
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        "Third Party Advisory"
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    },
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    },
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    },
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      "tags": [
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    },
    {
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      "url": "https://security.gentoo.org/glsa/202309-06"
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  "sourceIdentifier": "secure@microsoft.com",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.