Vulnerability-Lookup

FKIE_CVE-2026-84008

Vulnerability from fkie_nvd - Published: 2026-10-13 19:20 - Updated: 2026-10-13 23:18

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

References

	URL	Tags
	secure@microsoft.com	https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84008

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "platforms": [
            "Windows 11 version 26H1",
            "Windows Server 2012",
            "Windows Server 2012 R2"
          ],
          "product": "Microsoft .NET Framework 3.5",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "2.0.50727.9188 AND 3.0.30729.9171",
              "status": "affected",
              "version": "3.5.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "Windows 10 version 1607",
            "Windows Server 2016",
            "Windows Server 2019"
          ],
          "product": "Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0",
              "status": "affected",
              "version": "3.0.0.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "Windows 10 version 1809"
          ],
          "product": "Microsoft .NET Framework 3.5 AND 4.7.2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0",
              "status": "affected",
              "version": "4.7.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "Windows 10 version 1809",
            "Windows 10 version 21H2",
            "Windows 10 version 22H2",
            "Windows Server 2019",
            "Windows Server 2022"
          ],
          "product": "Microsoft .NET Framework 3.5 AND 4.8",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0",
              "status": "affected",
              "version": "4.8.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "Windows 10 version 21H2",
            "Windows 10 version 22H2",
            "Windows 11 version 23H2",
            "Windows 11 version 24H2",
            "Windows 11 version 25H2",
            "Windows 11 version 26H2",
            "Windows Server 2022",
            "Windows Server 2025"
          ],
          "product": "Microsoft .NET Framework 3.5 AND 4.8.1",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0",
              "status": "affected",
              "version": "4.8.1",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "Windows Server 2012",
            "Windows Server 2012 R2"
          ],
          "product": "Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "4.7.4150.0",
              "status": "affected",
              "version": "4.7.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            "Windows 10 version 1607",
            "Windows Server 2012",
            "Windows Server 2012 R2",
            "Windows Server 2016"
          ],
          "product": "Microsoft .NET Framework 4.8",
          "vendor": "Microsoft",
          "versions": [
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        },
        {
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          ],
          "product": "Microsoft .NET Framework 4.8.1",
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              "status": "affected",
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            }
          ]
        },
        {
          "product": "Microsoft Visual Studio 2022 version 17.14",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "17.14.42",
              "status": "affected",
              "version": "17.14.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "product": "Microsoft Visual Studio 2026 version 18.10",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "18.10.4",
              "status": "affected",
              "version": "18.10.0",
              "versionType": "custom"
            }
          ]
        },
        {
          "platforms": [
            ".NET 10.0 installed on Linux",
            ".NET 10.0 installed on Mac OS",
            ".NET 10.0 installed on Windows",
            ".NET 11.0 installed on Linux",
            ".NET 11.0 installed on Mac OS",
            ".NET 11.0 installed on Windows",
            ".NET 8.0 installed on Linux",
            ".NET 8.0 installed on Mac OS",
            ".NET 8.0 installed on Windows",
            ".NET 9.0 installed on Linux",
            ".NET 9.0 installed on Mac OS",
            ".NET 9.0 installed on Windows"
          ],
          "product": "System.Security.Cryptography.Pkcs",
          "vendor": "Microsoft",
          "versions": [
            {
              "lessThan": "10.0.13",
              "status": "affected",
              "version": "10.0.0",
              "versionType": "custom"
            }
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      ],
      "source": "secure@microsoft.com"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network."
    }
  ],
  "id": "CVE-2026-84008",
  "lastModified": "2026-10-13T23:18:40.710",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
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          "options": [
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              "exploitation": "none"
            },
            {
              "automatable": "yes"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2026-10-13T22:07:10.813689Z",
          "version": "2.0.3"
        }
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    ]
  },
  "published": "2026-10-13T19:20:50.780",
  "references": [
    {
      "source": "secure@microsoft.com",
      "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-84008"
    }
  ],
  "sourceIdentifier": "secure@microsoft.com",
  "vulnStatus": "Awaiting Analysis",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-407"
        }
      ],
      "source": "secure@microsoft.com",
      "type": "Secondary"
    }
  ]
}

CVE-2026-84008 (GCVE-0-2026-84008)

Vulnerability from cvelistv5 – Published: 2026-10-13 19:01 – Updated: 2026-10-13 22:23

Title

.NET Denial of Service Vulnerability

Summary

Inefficient algorithmic complexity in .NET allows an unauthorized attacker to deny service over a network.

Severity

7.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H/E:U/RL:O/RC:C

SSVC

Exploitation: none Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-13 22:07 UTC

CWE

CWE-407 - Inefficient Algorithmic Complexity

Assigner

microsoft CNA under the mitre root

CNA scorecard B 82/100 over 3923 records in the last 180 days details

References

1 reference

URL	Tags
https://msrc.microsoft.com/update-guide/vulnerabi…	vendor-advisorypatch

Impacted products

11 products

Vendor	Product	Version
Microsoft	Microsoft .NET Framework 3.5	Affected: 3.5.0 , < 2.0.50727.9188 AND 3.0.30729.9171 (custom)
Microsoft	Microsoft .NET Framework 3.5 AND 4.6.2/4.7/4.7.1/4.7.2	Affected: 3.0.0.0 , < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 (custom)
Microsoft	Microsoft .NET Framework 3.5 AND 4.7.2	Affected: 4.7.0 , < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.7.4150.0 (custom)
Microsoft	Microsoft .NET Framework 3.5 AND 4.8	Affected: 4.8.0 , < 2.0.50727.9073 AND 3.0.30729.9070 AND 4.8.4811.0 (custom)
Microsoft	Microsoft .NET Framework 3.5 AND 4.8.1	Affected: 4.8.1 , < 2.0.50727.9188 AND 3.0.30729.9171 AND 4.8.9363.0 (custom)
Microsoft	Microsoft .NET Framework 4.6.2/4.7/4.7.1/4.7.2	Affected: 4.7.0 , < 4.7.4150.0 (custom)
Microsoft	Microsoft .NET Framework 4.8	Affected: 4.8.0 , < 4.8.4811.0 (custom)
Microsoft	Microsoft .NET Framework 4.8.1	Affected: 4.8.0.0 , < 4.8.9363.0 (custom)
Microsoft	Microsoft Visual Studio 2022 version 17.14	Affected: 17.14.0 , < 17.14.42 (custom)
Microsoft	Microsoft Visual Studio 2026 version 18.10	Affected: 18.10.0 , < 18.10.4 (custom)
Microsoft	System.Security.Cryptography.Pkcs	Affected: 10.0.0 , < 10.0.13 (custom)

Date Public

2026-10-13 14:00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
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                "id": "CVE-2026-84008",
                "options": [
                  {
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                  },
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                  },
                  {
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                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-13T22:07:10.813689Z",
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          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
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    ],
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}

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.

Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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