{
  "cveId": "CVE-2021-42785",
  "url": "https://patchblox.com/security/cve/CVE-2021-42785",
  "summary": "CVE-2021-42785 is fixed in TightVNC on 1 platform by TightVNC 2.8.63.0 (version 2.8.63.0), released August 9, 2021. It is not reported as exploited. Patch Radar priority: Urgent.",
  "title": "Buffer Overflow in tvnviewer.exe via Crafted Packet in TightVNC Viewer 2.8.59",
  "description": "Buffer Overflow vulnerability in tvnviewer.exe of TightVNC Viewer allows a remote attacker to execute arbitrary instructions via a crafted FramebufferUpdate packet from a VNC server.",
  "published": "2021-11-23T22:15:08Z",
  "severity": "",
  "cvss": 9.8,
  "cwe": "CWE-120: Buffer Overflow",
  "epss": 0.02342,
  "epssPercentile": 0.83745,
  "priority": "Urgent",
  "priorityTier": 2,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://nvd.nist.gov/vuln/detail/CVE-2021-42785",
  "fixes": [
    {
      "platform": "windows-app",
      "product": "TightVNC",
      "fixedVersion": "2.8.63.0",
      "fix": "TightVNC 2.8.63.0",
      "url": "https://patchblox.com/security/fix/windows-app/glavsoft.tightvnc-2.8.63.0",
      "released": "2021-08-09T00:00:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T19:12:23Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}