{
  "cveId": "CVE-2025-53809",
  "url": "https://patchblox.com/security/cve/CVE-2025-53809",
  "summary": "CVE-2025-53809 is fixed in 4 products on 1 platform, first by KB5065426, released September 9, 2025. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "Local Security Authority Subsystem Service (LSASS) Denial of Service Vulnerability",
  "description": "\u003Cp\u003EImproper input validation in Windows Local Security Authority Subsystem Service (LSASS) allows an authorized attacker to deny service over a network.\u003C/p\u003E",
  "published": "2025-09-09T12:00:00Z",
  "severity": "Important",
  "cvss": 6.5,
  "cwe": "Improper Input Validation",
  "epss": 0.01573,
  "epssPercentile": 0.75562,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-53809",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 24H2 for ARM64-based Systems",
      "fixedVersion": "26100.6584",
      "fix": "KB5065426",
      "url": "https://patchblox.com/security/fix/microsoft/kb5065426",
      "released": "2025-09-09T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 24H2 for ARM64-based Systems",
      "fixedVersion": "26100.6508",
      "fix": "KB5065474",
      "url": "https://patchblox.com/security/fix/microsoft/kb5065474",
      "released": "2025-09-09T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 24H2 for x64-based Systems",
      "fixedVersion": "26100.6584",
      "fix": "KB5065426",
      "url": "https://patchblox.com/security/fix/microsoft/kb5065426",
      "released": "2025-09-09T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 24H2 for x64-based Systems",
      "fixedVersion": "26100.6508",
      "fix": "KB5065474",
      "url": "https://patchblox.com/security/fix/microsoft/kb5065474",
      "released": "2025-09-09T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2025",
      "fixedVersion": "26100.6584",
      "fix": "KB5065426",
      "url": "https://patchblox.com/security/fix/microsoft/kb5065426",
      "released": "2025-09-09T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2025",
      "fixedVersion": "26100.6508",
      "fix": "KB5065474",
      "url": "https://patchblox.com/security/fix/microsoft/kb5065474",
      "released": "2025-09-09T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2025 (Server Core installation)",
      "fixedVersion": "26100.6584",
      "fix": "KB5065426",
      "url": "https://patchblox.com/security/fix/microsoft/kb5065426",
      "released": "2025-09-09T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2025 (Server Core installation)",
      "fixedVersion": "26100.6508",
      "fix": "KB5065474",
      "url": "https://patchblox.com/security/fix/microsoft/kb5065474",
      "released": "2025-09-09T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T00:53:09Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}