{
  "cveId": "CVE-2021-36367",
  "url": "https://patchblox.com/security/cve/CVE-2021-36367",
  "summary": "CVE-2021-36367 is fixed in PuTTY on 1 platform by PuTTY 0.76.0.0 (version 0.76.0.0), released July 17, 2021. It is not reported as exploited. Patch Radar priority: High.",
  "title": "PuTTY: Insufficient Verification of Data Authenticity",
  "description": "PuTTY through 0.75 proceeds with establishing an SSH session even if it has never sent a substantive authentication response. This makes it easier for an attacker-controlled SSH server to present a later spoofed authentication prompt (that the attacker can use to capture credential data, and use that data for purposes that are undesired by the client user).",
  "published": "2021-07-09T21:15:08Z",
  "severity": "",
  "cvss": 8.1,
  "cwe": "CWE-345: Insufficient Verification of Data Authenticity",
  "epss": 0.01106,
  "epssPercentile": 0.66027,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2021-36367",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "PuTTY",
      "fixedVersion": "0.76.0.0",
      "fix": "PuTTY 0.76.0.0",
      "url": "https://patchblox.com/security/fix/windows-app/putty.putty-0.76.0.0",
      "released": "2021-07-17T00:00:00Z"
    }
  ],
  "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"
  }
}