Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to execute code over a network.

cve CVE-2025-62456 1 source, 1 claim · Watch

NVD writes:
Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to execute code over a network. the claim
Severity
HIGH NVD
CVSS
8.8 NVD
Fixed in
10.0.22631.6345, 10.0.26100.7462, 10.0.26200.7462, 10.0.20348.4529, 10.0.25398.2025 NVD
Vendor
Microsoft NVD
Product
Windows 11 version 22H3 NVD
CWE
CWE-122 NVD

How far exploitation has got

  1. No public code known
  2. Proof of concept
  3. Proof of concept, verified
  4. A Metasploit module
  5. Exploited in the wild
  6. Used in ransomware campaigns

Timeline

2025-12-09first spoke of it: Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to execute code over a network.NVD

What it is to other things

affectsmicrosoft/windows_11_23h2
NVD
affectsmicrosoft/windows_11_24h2
NVD
affectsmicrosoft/windows_11_25h2
NVD
affectsmicrosoft/windows_server_2022
NVD
affectsmicrosoft/windows_server_2022_23h2
NVD
affectsmicrosoft/windows_server_2025
NVD
made_bymicrosoft
NVD

In words only, so not counted until a person confirms one:

affectsmicrosoft/windows_11_version_22h3
NVD says “Microsoft · Windows 11 version 22H3”
Every value, with what each source said and its receipt
PropertySourceSaidMeans here
Automatable
automatable
NVDno
At least one of those steps needs a person.
receipt
Source
NVD
Its words
no
Read by
field:cve.metrics.ssvcV203[].ssvcData.options[].automatable
Said since
2026-10-06 11:54 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 11:54 UTCno
2026-10-02 12:00 UTC—
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "ARM64-based Systems"
            ],
            "product": "Windows 11 version 22H3",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.22631.6345",
                "status": "affected",
                "version": "10.0.22631.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows 11 Version 23H2",
            "vendor": "Microsoft",
            "versions": [
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                "status": "affected",
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                "versionType": "custom"
              }
            ]
          },
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            ],
            "product": "Windows 11 Version 24H2",
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                "status": "affected",
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                "versionType": "custom"
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            ]
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}
—
CVSS
cvss
NVD8.8
receipt
Source
NVD
Its words
8.8
Read by
field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseScore || field:cve.metrics.cvssMetricV31[].cvssData.baseScore
Said since
2026-10-02 12:00 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
What the source handed over
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—
CVSS vector
cvss_vector
NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
receipt
Source
NVD
Its words
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Read by
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Said since
2026-10-06 11:54 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 11:54 UTCCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
2026-10-02 12:00 UTC—
What the source handed over
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        "value": "Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to execute code over a network."
      },
      {
        "lang": "es",
        "value": "Desbordamiento de búfer basado en montículo en el Sistema de Archivos Resistente de Windows (ReFS) permite a un atacante autorizado ejecutar código a través de una red."
      }
    ],
    "id": "CVE-2025-62456",
    "lastModified": "2026-09-30T20:10:00.247",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
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          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
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            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2025-12-10T04:56:17.924087Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2025-12-09T18:15:57.143",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62456"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-122"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}
—
CWE
cwe
NVDCWE-122
receipt
Source
NVD
Its words
CWE-122
Read by
field:cve.weaknesses[].description[].value
Said since
2026-10-06 11:54 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 11:54 UTCCWE-122
2026-10-02 12:00 UTC—
What the source handed over
{
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    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "ARM64-based Systems"
            ],
            "product": "Windows 11 version 22H3",
            "vendor": "Microsoft",
            "versions": [
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                "status": "affected",
                "version": "10.0.22631.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
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            ],
            "product": "Windows 11 Version 23H2",
            "vendor": "Microsoft",
            "versions": [
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                "status": "affected",
                "version": "10.0.22631.0",
                "versionType": "custom"
              }
            ]
          },
          {
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              "x64-based Systems"
            ],
            "product": "Windows 11 Version 24H2",
            "vendor": "Microsoft",
            "versions": [
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                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Windows 11 Version 25H2",
            "vendor": "Microsoft",
            "versions": [
              {
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                "status": "affected",
                "version": "10.0.26200.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.20348.4529",
                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022, 23H2 Edition (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.25398.2025",
                "status": "affected",
                "version": "10.0.25398.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.7462",
                "status": "affected",
                "version": "10.0.26100.0",
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              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.7462",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
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        "nodes": [
          {
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                "versionEndExcluding": "10.0.22631.6345",
                "vulnerable": true
              },
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    "cveTags": [],
    "descriptions": [
      {
        "lang": "en",
        "value": "Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to execute code over a network."
      },
      {
        "lang": "es",
        "value": "Desbordamiento de búfer basado en montículo en el Sistema de Archivos Resistente de Windows (ReFS) permite a un atacante autorizado ejecutar código a través de una red."
      }
    ],
    "id": "CVE-2025-62456",
    "lastModified": "2026-09-30T20:10:00.247",
    "metrics": {
      "cvssMetricV31": [
        {
          "cvssData": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2025-62456",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2025-12-10T04:56:17.924087Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2025-12-09T18:15:57.143",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62456"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-122"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}
—
Exploitation
exploitation
NVDnone
No evidence of exploitation, and no public proof of concept.
receipt
Source
NVD
Its words
none
Read by
field:cve.metrics.ssvcV203[].ssvcData.options[].exploitation
Said since
2026-10-06 11:54 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 11:54 UTCnone
2026-10-02 12:00 UTC—
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "ARM64-based Systems"
            ],
            "product": "Windows 11 version 22H3",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.22631.6345",
                "status": "affected",
                "version": "10.0.22631.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows 11 Version 23H2",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.22631.6345",
                "status": "affected",
                "version": "10.0.22631.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "ARM64-based Systems",
              "x64-based Systems"
            ],
            "product": "Windows 11 Version 24H2",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.7462",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Windows 11 Version 25H2",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26200.7462",
                "status": "affected",
                "version": "10.0.26200.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.20348.4529",
                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022, 23H2 Edition (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.25398.2025",
                "status": "affected",
                "version": "10.0.25398.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.7462",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.7462",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
        "nodes": [
          {
            "cpeMatch": [
              {
                "criteria": "cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:*",
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              },
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                "matchCriteriaId": "E9CE4A36-DA42-40CC-8724-E30A22CA84B6",
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              },
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        "value": "Desbordamiento de búfer basado en montículo en el Sistema de Archivos Resistente de Windows (ReFS) permite a un atacante autorizado ejecutar código a través de una red."
      }
    ],
    "id": "CVE-2025-62456",
    "lastModified": "2026-09-30T20:10:00.247",
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            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "LOW",
            "scope": "UNCHANGED",
            "userInteraction": "NONE",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "exploitabilityScore": 2.8,
          "impactScore": 5.9,
          "source": "secure@microsoft.com",
          "type": "Secondary"
        }
      ],
      "ssvcV203": [
        {
          "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "ssvcData": {
            "id": "CVE-2025-62456",
            "options": [
              {
                "exploitation": "none"
              },
              {
                "automatable": "no"
              },
              {
                "technicalImpact": "total"
              }
            ],
            "role": "CISA Coordinator",
            "timestamp": "2025-12-10T04:56:17.924087Z",
            "version": "2.0.3"
          }
        }
      ]
    },
    "published": "2025-12-09T18:15:57.143",
    "references": [
      {
        "source": "secure@microsoft.com",
        "tags": [
          "Vendor Advisory"
        ],
        "url": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-62456"
      }
    ],
    "sourceIdentifier": "secure@microsoft.com",
    "vulnStatus": "Analyzed",
    "weaknesses": [
      {
        "description": [
          {
            "lang": "en",
            "value": "CWE-122"
          }
        ],
        "source": "secure@microsoft.com",
        "type": "Secondary"
      }
    ]
  }
}
—
Fixed in
fixed_in
NVD10.0.22631.6345, 10.0.26100.7462, 10.0.26200.7462, 10.0.20348.4529, 10.0.25398.2025
receipt
Source
NVD
Its words
10.0.22631.6345, 10.0.26100.7462, 10.0.26200.7462, 10.0.20348.4529, 10.0.25398.2025
Read by
field:cve.affected[].affectedData[].versions[status=affected].lessThan
Said since
2026-10-06 12:29 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 12:29 UTC10.0.22631.6345, 10.0.26100.7462, 10.0.26200.7462, 10.0.20348.4529, 10.0.25398.2025
2026-10-06 11:54 UTC10.0.22631.6345, 10.0.22631.6345, 10.0.26100.7462, 10.0.26200.7462, 10.0.20348.4529, 10.0.25398.2025, 10.0.26100.7462, 10.0.26100.7462
2026-10-02 12:00 UTC—
What the source handed over
{
  "cve": {
    "affected": [
      {
        "affectedData": [
          {
            "platforms": [
              "ARM64-based Systems"
            ],
            "product": "Windows 11 version 22H3",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.22631.6345",
                "status": "affected",
                "version": "10.0.22631.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows 11 Version 23H2",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.22631.6345",
                "status": "affected",
                "version": "10.0.22631.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "ARM64-based Systems",
              "x64-based Systems"
            ],
            "product": "Windows 11 Version 24H2",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.7462",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "product": "Windows 11 Version 25H2",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26200.7462",
                "status": "affected",
                "version": "10.0.26200.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.20348.4529",
                "status": "affected",
                "version": "10.0.20348.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2022, 23H2 Edition (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.25398.2025",
                "status": "affected",
                "version": "10.0.25398.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.7462",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          },
          {
            "platforms": [
              "x64-based Systems"
            ],
            "product": "Windows Server 2025 (Server Core installation)",
            "vendor": "Microsoft",
            "versions": [
              {
                "lessThan": "10.0.26100.7462",
                "status": "affected",
                "version": "10.0.26100.0",
                "versionType": "custom"
              }
            ]
          }
        ],
        "source": "secure@microsoft.com"
      }
    ],
    "configurations": [
      {
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}
—
Product
product
NVDWindows 11 version 22H3
receipt
Source
NVD
Its words
Windows 11 version 22H3
Read by
field:cve.affected[].affectedData[].product
Said since
2026-10-02 12:00 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
What the source handed over
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}
—
Severity
severity
NVDHIGH
From 7.0 to 8.9.
receipt
Source
NVD
Its words
HIGH
Read by
field:cve.metrics.cvssMetricV31[type=Primary].cvssData.baseSeverity || field:cve.metrics.cvssMetricV31[].cvssData.baseSeverity
Said since
2026-10-06 11:54 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 11:54 UTCHIGH
2026-10-02 12:00 UTC—
What the source handed over
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high
Status
status
NVDAnalyzed
receipt
Source
NVD
Its words
Analyzed
Read by
field:cve.vulnStatus
Said since
2026-10-02 12:00 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
What the source handed over
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—
Technical impact
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NVDtotal
The attacker gains full control of the component, or all of its information.
receipt
Source
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Its words
total
Read by
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Said since
2026-10-06 11:54 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
2026-10-06 11:54 UTCtotal
2026-10-02 12:00 UTC—
What the source handed over
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—
Vendor
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NVDMicrosoft
receipt
Source
NVD
Its words
Microsoft
Read by
field:cve.affected[].affectedData[].vendor
Said since
2026-10-02 12:00 UTC
Last answered
2026-10-06 12:41 UTC
Original
open at the source
What the source handed over
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—
Every claim, by kind

vulnerability

Heap-based buffer overflow in Windows Resilient File System (ReFS) allows an authorized attacker to execute code over a network.
zetlyn/cve-nvd · 2025-12-09
automatable no cvss 8.8 cvss_vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H cwe CWE-122 exploitation none fixed_in 10.0.22631.6345, 10.0.26100.7462, 10.0.26200.7462, 10.0.20348.4529, 10.0.25398.2025 product Windows 11 version 22H3 severity HIGH status Analyzed technical_impact total vendor Microsoft source