{
  "cveId": "CVE-2021-3520",
  "url": "https://patchblox.com/security/cve/CVE-2021-3520",
  "summary": "CVE-2021-3520 is fixed in 9 products on 1 platform, first by liblz4-1 0.0~r131-2ubuntu3.1, released April 29, 2021. It is not reported as exploited. Patch Radar priority: High.",
  "title": "lz4: The lz4 packages provide support for LZ4, a very fast, lossless compression algorithm that provides compression speed...",
  "description": "The lz4 packages provide support for LZ4, a very fast, lossless compression algorithm that provides compression speeds of 400 MB/s per core and scales with multicore CPUs. It also features an extremely fast decoder that reaches speeds of multiple GB/s per core and typically reaches RAM speed limits on multicore systems.\n\nSecurity Fix(es):\n\n* lz4: memory corruption due to an integer overflow bug caused by memmove argument (CVE-2021-3520)\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.",
  "published": "2021-04-29T17:00:00Z",
  "severity": "Moderate",
  "cvss": 9.8,
  "epss": 0.03401,
  "epssPercentile": 0.8892,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "liblz4-1",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "0.0~r131-2ubuntu3.1",
      "fix": "liblz4-1 0.0~r131-2ubuntu3.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-liblz4-1-0.0-r131-2ubuntu3.1",
      "released": "2021-04-29T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "liblz4-1",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.2-2ubuntu0.20.04.1",
      "fix": "liblz4-1 1.9.2-2ubuntu0.20.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-liblz4-1-1.9.2-2ubuntu0.20.04.1",
      "released": "2021-04-29T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "liblz4-tool",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "0.0~r131-2ubuntu3.1",
      "fix": "liblz4-tool 0.0~r131-2ubuntu3.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-liblz4-tool-0.0-r131-2ubuntu3.1",
      "released": "2021-04-29T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "liblz4-tool",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.2-2ubuntu0.20.04.1",
      "fix": "liblz4-tool 1.9.2-2ubuntu0.20.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-liblz4-tool-1.9.2-2ubuntu0.20.04.1",
      "released": "2021-04-29T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4",
      "release": "RHEL 8",
      "fixedVersion": "0:1.8.3-3.el8_4",
      "fix": "RHSA-2021:2575",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2575",
      "released": "2021-06-29T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "1.9.2-2ubuntu0.20.04.1",
      "fix": "lz4 1.9.2-2ubuntu0.20.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-lz4-1.9.2-2ubuntu0.20.04.1",
      "released": "2021-04-29T17:00:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4",
      "release": "amzn 2023",
      "fixedVersion": "1.9.4-1.amzn2023.0.2",
      "fix": "ALAS2023-2023-015",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-015",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4",
      "release": "ol 8",
      "fixedVersion": "0:1.8.3-3.el8_4",
      "fix": "ELSA-2021-2575",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2575",
      "released": "2021-06-30T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.9.4-1.amzn2023.0.2",
      "fix": "ALAS2023-2023-015",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-015",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4-debugsource",
      "release": "amzn 2023",
      "fixedVersion": "1.9.4-1.amzn2023.0.2",
      "fix": "ALAS2023-2023-015",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-015",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4-devel",
      "release": "RHEL 8",
      "fixedVersion": "0:1.8.3-3.el8_4",
      "fix": "RHSA-2021:2575",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2575",
      "released": "2021-06-29T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4-devel",
      "release": "amzn 2023",
      "fixedVersion": "1.9.4-1.amzn2023.0.2",
      "fix": "ALAS2023-2023-015",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-015",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4-devel",
      "release": "ol 8",
      "fixedVersion": "0:1.8.3-3.el8_4",
      "fix": "ELSA-2021-2575",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2575",
      "released": "2021-06-30T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4-libs",
      "release": "RHEL 8",
      "fixedVersion": "0:1.8.3-3.el8_4",
      "fix": "RHSA-2021:2575",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-2575",
      "released": "2021-06-29T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4-libs",
      "release": "amzn 2023",
      "fixedVersion": "1.9.4-1.amzn2023.0.2",
      "fix": "ALAS2023-2023-015",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-015",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4-libs",
      "release": "ol 8",
      "fixedVersion": "0:1.8.3-3.el8_4",
      "fix": "ELSA-2021-2575",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-2575",
      "released": "2021-06-30T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4-libs-debuginfo",
      "release": "amzn 2023",
      "fixedVersion": "1.9.4-1.amzn2023.0.2",
      "fix": "ALAS2023-2023-015",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-015",
      "released": "2023-02-17T20:43:00Z"
    },
    {
      "platform": "linux",
      "product": "lz4-static",
      "release": "amzn 2023",
      "fixedVersion": "1.9.4-1.amzn2023.0.2",
      "fix": "ALAS2023-2023-015",
      "url": "https://patchblox.com/security/fix/linux/alas2023-2023-015",
      "released": "2023-02-17T20:43:00Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}