{
  "cveId": "CVE-2021-43304",
  "url": "https://patchblox.com/security/cve/CVE-2021-43304",
  "summary": "CVE-2021-43304 is fixed in clickhouse on 1 platform by DEBIAN-CVE-2021-43304 (version 18.16.1\u002Bds-7.3), released March 14, 2022. It is not reported as exploited. Patch Radar priority: High.",
  "title": "clickhouse: Heap buffer overflow in Clickhouse\u0027s LZ4 compression codec when parsing a malicious query",
  "description": "Heap buffer overflow in Clickhouse\u0027s LZ4 compression codec when parsing a malicious query. There is no verification that the copy operations in the LZ4::decompressImpl loop and especially the arbitrary copy operation wildCopy\u003Ccopy_amount\u003E(op, ip, copy_end), don\u2019t exceed the destination buffer\u2019s limits.",
  "published": "2022-03-14T23:15:08Z",
  "severity": "high",
  "cvss": 8.8,
  "cvssVector": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.01672,
  "epssPercentile": 0.76969,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "clickhouse",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "18.16.1\u002Bds-7.3",
      "fix": "DEBIAN-CVE-2021-43304",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-43304",
      "released": "2022-03-14T23:15:08Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-09T07:25:28Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}