MSRC_CVE-2026-20833

Vulnerability from csaf_microsoft - Published: 2026-01-13 08:00 - Updated: 2026-01-13 08:00
Summary
Windows Kerberos Information Disclosure Vulnerability
Severity
Important
Notes
Additional Resources: To determine the support lifecycle for your software, see the Microsoft Support Lifecycle: https://support.microsoft.com/lifecycle
Disclaimer: The information provided in the Microsoft Knowledge Base is provided \"as is\" without warranty of any kind. Microsoft disclaims all warranties, either express or implied, including the warranties of merchantability and fitness for a particular purpose. In no event shall Microsoft Corporation or its suppliers be liable for any damages whatsoever including direct, indirect, incidental, consequential, loss of business profits or special damages, even if Microsoft Corporation or its suppliers have been advised of the possibility of such damages. Some states do not allow the exclusion or limitation of liability for consequential or incidental damages so the foregoing limitation may not apply.
Customer Action: Required. The vulnerability documented by this CVE requires customer action to resolve.
CWE-327 - Use of a Broken or Risky Cryptographic Algorithm
Affected products
Product Identifier Version Remediation
Windows Server 2008 for 32-bit Systems Service Pack 2 6.0.6003.23717
Windows Server 2008 for 32-bit Systems Service Pack 2
6.0.6003.23717
Windows Server 2008 for x64-based Systems Service Pack 2 6.0.6003.23717
Windows Server 2008 for x64-based Systems Service Pack 2
6.0.6003.23717
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) 6.0.6003.23717
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
6.0.6003.23717
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) 6.1.7601.28117
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
6.1.7601.28117
Windows Server 2008 R2 for x64-based Systems Service Pack 1 6.1.7601.28117
Windows Server 2008 R2 for x64-based Systems Service Pack 1
6.1.7601.28117
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) 6.0.6003.23717
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
6.0.6003.23717
Windows Server 2012 6.2.9200.25868
Windows Server 2012
6.2.9200.25868
Windows Server 2012 (Server Core installation) 6.2.9200.25868
Windows Server 2012 (Server Core installation)
6.2.9200.25868
Windows Server 2012 R2 6.3.9600.22968
Windows Server 2012 R2
6.3.9600.22968
Windows Server 2012 R2 (Server Core installation) 6.3.9600.22968
Windows Server 2012 R2 (Server Core installation)
6.3.9600.22968
Windows Server 2016 10.0.14393.8783
Windows Server 2016
10.0.14393.8783
Windows Server 2016 (Server Core installation) 10.0.14393.8783
Windows Server 2016 (Server Core installation)
10.0.14393.8783
Windows Server 2019 10.0.17763.8276
Windows Server 2019
10.0.17763.8276
Windows Server 2019 (Server Core installation) 10.0.17763.8276
Windows Server 2019 (Server Core installation)
10.0.17763.8276
Windows Server 2022 10.0.20348.4648
Windows Server 2022
10.0.20348.4648
Windows Server 2022 (Server Core installation) 10.0.20348.4648
Windows Server 2022 (Server Core installation)
10.0.20348.4648
Windows Server 2022, 23H2 Edition (Server Core installation) 10.0.25398.2092
Windows Server 2022, 23H2 Edition (Server Core installation)
10.0.25398.2092
Windows Server 2025 10.0.26100.32230
Windows Server 2025
10.0.26100.32230
Windows Server 2025 (Server Core installation) 10.0.26100.32230
Windows Server 2025 (Server Core installation)
10.0.26100.32230
Product Identifier Version Remediation
Windows Server 2025 (Server Core installation) <10.0.26100.32230
Windows Server 2025 (Server Core installation)
<10.0.26100.32230
Vendor Fix fix
Windows Server 2025 <10.0.26100.32230
Windows Server 2025
<10.0.26100.32230
Vendor Fix fix
Windows Server 2022, 23H2 Edition (Server Core installation) <10.0.25398.2092
Windows Server 2022, 23H2 Edition (Server Core installation)
<10.0.25398.2092
Vendor Fix fix
Windows Server 2022 (Server Core installation) <10.0.20348.4648
Windows Server 2022 (Server Core installation)
<10.0.20348.4648
Vendor Fix fix
Windows Server 2022 <10.0.20348.4648
Windows Server 2022
<10.0.20348.4648
Vendor Fix fix
Windows Server 2019 (Server Core installation) <10.0.17763.8276
Windows Server 2019 (Server Core installation)
<10.0.17763.8276
Vendor Fix fix
Windows Server 2019 <10.0.17763.8276
Windows Server 2019
<10.0.17763.8276
Vendor Fix fix
Windows Server 2016 (Server Core installation) <10.0.14393.8783
Windows Server 2016 (Server Core installation)
<10.0.14393.8783
Vendor Fix fix
Windows Server 2016 <10.0.14393.8783
Windows Server 2016
<10.0.14393.8783
Vendor Fix fix
Windows Server 2012 R2 (Server Core installation) <6.3.9600.22968
Windows Server 2012 R2 (Server Core installation)
<6.3.9600.22968
Vendor Fix fix
Windows Server 2012 R2 <6.3.9600.22968
Windows Server 2012 R2
<6.3.9600.22968
Vendor Fix fix
Windows Server 2012 (Server Core installation) <6.2.9200.25868
Windows Server 2012 (Server Core installation)
<6.2.9200.25868
Vendor Fix fix
Windows Server 2012 <6.2.9200.25868
Windows Server 2012
<6.2.9200.25868
Vendor Fix fix
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation) <6.0.6003.23717
Windows Server 2008 for 32-bit Systems Service Pack 2 (Server Core installation)
<6.0.6003.23717
Vendor Fix fix
Vendor Fix fix
Windows Server 2008 R2 for x64-based Systems Service Pack 1 <6.1.7601.28117
Windows Server 2008 R2 for x64-based Systems Service Pack 1
<6.1.7601.28117
Vendor Fix fix
Vendor Fix fix
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation) <6.1.7601.28117
Windows Server 2008 R2 for x64-based Systems Service Pack 1 (Server Core installation)
<6.1.7601.28117
Vendor Fix fix
Vendor Fix fix
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation) <6.0.6003.23717
Windows Server 2008 for x64-based Systems Service Pack 2 (Server Core installation)
<6.0.6003.23717
Vendor Fix fix
Vendor Fix fix
Windows Server 2008 for x64-based Systems Service Pack 2 <6.0.6003.23717
Windows Server 2008 for x64-based Systems Service Pack 2
<6.0.6003.23717
Vendor Fix fix
Vendor Fix fix
Windows Server 2008 for 32-bit Systems Service Pack 2 <6.0.6003.23717
Windows Server 2008 for 32-bit Systems Service Pack 2
<6.0.6003.23717
Vendor Fix fix
Vendor Fix fix
Threats
Impact Information Disclosure
Exploit Status Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely
Acknowledgments
Windows Authentication Platform team

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  "vulnerabilities": [
    {
      "cve": "CVE-2026-20833",
      "cwe": {
        "id": "CWE-327",
        "name": "Use of a Broken or Risky Cryptographic Algorithm"
      },
      "notes": [
        {
          "category": "general",
          "text": "Microsoft",
          "title": "Assigning CNA"
        },
        {
          "category": "faq",
          "text": "Yes, please see How to manage Kerberos protocol changes related to CVE-2026-20833 for more information about how to protect from this vulnerability.",
          "title": "Are there other steps that need to be done to protect from exploitation of this vulnerability?"
        },
        {
          "category": "faq",
          "text": "The type of information that could be disclosed if an attacker successfully exploited this vulnerability is secrets or privileged information belonging to the user of the affected application.",
          "title": "What type of information could be disclosed by this vulnerability?"
        }
      ],
      "product_status": {
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          "9312",
          "9318",
          "9344",
          "10049",
          "10051",
          "10287",
          "10378",
          "10379",
          "10483",
          "10543",
          "10816",
          "10855",
          "11571",
          "11572",
          "11923",
          "11924",
          "12244",
          "12436",
          "12437"
        ],
        "known_affected": [
          "1",
          "2",
          "3",
          "4",
          "5",
          "6",
          "7",
          "8",
          "9",
          "10",
          "11",
          "12",
          "13",
          "14",
          "15",
          "16",
          "17",
          "18",
          "19"
        ]
      },
      "references": [
        {
          "category": "self",
          "summary": "CVE-2026-20833 Windows Kerberos Information Disclosure Vulnerability - HTML",
          "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20833"
        },
        {
          "category": "self",
          "summary": "CVE-2026-20833 Windows Kerberos Information Disclosure Vulnerability - CSAF",
          "url": "https://msrc.microsoft.com/csaf/advisories/2026/msrc_cve-2026-20833.json"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.17763.8276:Security Update:https://support.microsoft.com/help/5073723",
          "product_ids": [
            "7",
            "6"
          ],
          "url": "https://support.microsoft.com/help/5073723"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.20348.4648:Security Update:https://support.microsoft.com/help/5073457",
          "product_ids": [
            "5",
            "4"
          ],
          "url": "https://support.microsoft.com/help/5073457"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.26100.32230:Security Update:https://support.microsoft.com/en-us/topic/a6021fd2-b3b7-45a7-b68e-35c28a2a77da",
          "product_ids": [
            "1",
            "2"
          ],
          "url": "https://support.microsoft.com/en-us/topic/a6021fd2-b3b7-45a7-b68e-35c28a2a77da"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.25398.2092:Security Update:https://support.microsoft.com/help/5073450",
          "product_ids": [
            "3"
          ],
          "url": "https://support.microsoft.com/help/5073450"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "10.0.14393.8783:Security Update:https://support.microsoft.com/help/5073722",
          "product_ids": [
            "9",
            "8"
          ],
          "url": "https://support.microsoft.com/help/5073722"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "6.0.6003.23717:Monthly Rollup:https://support.microsoft.com/help/5073697",
          "product_ids": [
            "19",
            "14",
            "18",
            "17"
          ],
          "url": "https://support.microsoft.com/help/5073697"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "6.0.6003.23717:Security Only:https://support.microsoft.com/help/5073700",
          "product_ids": [
            "19",
            "14",
            "18",
            "17"
          ],
          "url": "https://support.microsoft.com/help/5073700"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "6.1.7601.28117:Monthly Rollup:https://support.microsoft.com/help/5073695",
          "product_ids": [
            "15",
            "16"
          ],
          "url": "https://support.microsoft.com/help/5073695"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "6.1.7601.28117:Security Only:https://support.microsoft.com/help/5073699",
          "product_ids": [
            "15",
            "16"
          ],
          "url": "https://support.microsoft.com/help/5073699"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "6.2.9200.25868:Monthly Rollup:https://support.microsoft.com/help/5073698",
          "product_ids": [
            "13",
            "12"
          ],
          "url": "https://support.microsoft.com/help/5073698"
        },
        {
          "category": "vendor_fix",
          "date": "2026-01-13T08:00:00.000Z",
          "details": "6.3.9600.22968:Monthly Rollup:https://support.microsoft.com/help/5073696",
          "product_ids": [
            "11",
            "10"
          ],
          "url": "https://support.microsoft.com/help/5073696"
        }
      ],
      "scores": [
        {
          "cvss_v3": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "NONE",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "environmentalsScore": 0.0,
            "exploitCodeMaturity": "UNPROVEN",
            "integrityImpact": "NONE",
            "privilegesRequired": "LOW",
            "remediationLevel": "OFFICIAL_FIX",
            "reportConfidence": "CONFIRMED",
            "scope": "UNCHANGED",
            "temporalScore": 4.8,
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C",
            "version": "3.1"
          },
          "products": [
            "1",
            "2",
            "3",
            "4",
            "5",
            "6",
            "7",
            "8",
            "9",
            "10",
            "11",
            "12",
            "13",
            "14",
            "15",
            "16",
            "17",
            "18",
            "19"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "details": "Information Disclosure"
        },
        {
          "category": "exploit_status",
          "details": "Publicly Disclosed:No;Exploited:No;Latest Software Release:Exploitation Less Likely"
        }
      ],
      "title": "Windows Kerberos Information Disclosure Vulnerability"
    }
  ]
}


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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.


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Detection rules are retrieved from Rulezet.

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