{
  "cveId": "CVE-2025-21311",
  "url": "https://patchblox.com/security/cve/CVE-2025-21311",
  "summary": "CVE-2025-21311 is fixed in 6 products on 2 platforms, first by KB5050009, released January 14, 2025. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "Windows NTLM V1 Elevation of Privilege Vulnerability",
  "description": "Windows NTLM V1 Elevation of Privilege Vulnerability",
  "published": "2025-01-14T14:00:00Z",
  "severity": "Critical",
  "cvss": 9.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
  "cwe": "Incorrect Implementation of Authentication Algorithm",
  "epss": 0.02262,
  "epssPercentile": 0.83099,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "exploitabilityAssessment": "Exploitation Less Likely",
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2025-21311",
  "fixes": [
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 24H2 for ARM64-based Systems",
      "fixedVersion": "26100.2894",
      "fix": "KB5050009",
      "url": "https://patchblox.com/security/fix/microsoft/kb5050009",
      "released": "2025-01-14T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows 11 Version 24H2 for x64-based Systems",
      "fixedVersion": "26100.2894",
      "fix": "KB5050009",
      "url": "https://patchblox.com/security/fix/microsoft/kb5050009",
      "released": "2025-01-14T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2022, 23H2 Edition (Server Core installation)",
      "fixedVersion": "25398.1369",
      "fix": "KB5049984",
      "url": "https://patchblox.com/security/fix/microsoft/kb5049984",
      "released": "2025-01-14T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2025",
      "fixedVersion": "26100.2894",
      "fix": "KB5050009",
      "url": "https://patchblox.com/security/fix/microsoft/kb5050009",
      "released": "2025-01-14T00:00:00Z"
    },
    {
      "platform": "microsoft",
      "product": "Windows Server 2025 (Server Core installation)",
      "fixedVersion": "26100.2894",
      "fix": "KB5050009",
      "url": "https://patchblox.com/security/fix/microsoft/kb5050009",
      "released": "2025-01-14T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "squid",
      "release": "Debian 14",
      "fixedVersion": "7.1-1",
      "fix": "DEBIAN-CVE-2025-21311",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2025-21311",
      "released": "2025-01-14T18:15:54Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T13:06:02Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}