{
  "cveId": "CVE-2021-3700",
  "url": "https://patchblox.com/security/cve/CVE-2021-3700",
  "summary": "CVE-2021-3700 is fixed in 4 products on 1 platform, first by libusbredirhost1 0.7.1-1ubuntu0.18.04.1, released February 24, 2022. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "usbredir: A use-after-free vulnerability was found in usbredir in versions prior to 0.11.0 in the usbredirparser_serialize() in...",
  "description": "A use-after-free vulnerability was found in usbredir in versions prior to 0.11.0 in the usbredirparser_serialize() in usbredirparser/usbredirparser.c. This issue occurs when serializing large amounts of buffered write data in the case of a slow or blocked destination.",
  "published": "2022-02-24T11:15:00Z",
  "severity": "medium",
  "cvss": 6.4,
  "cvssVector": "CVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00314,
  "epssPercentile": 0.24442,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "libusbredirhost1",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "0.7.1-1ubuntu0.18.04.1",
      "fix": "libusbredirhost1 0.7.1-1ubuntu0.18.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libusbredirhost1-0.7.1-1ubuntu0.18.04.1",
      "released": "2022-02-24T11:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libusbredirhost1",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "0.8.0-1ubuntu0.1",
      "fix": "libusbredirhost1 0.8.0-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libusbredirhost1-0.8.0-1ubuntu0.1",
      "released": "2022-02-24T11:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libusbredirparser1",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "0.7.1-1ubuntu0.18.04.1",
      "fix": "libusbredirparser1 0.7.1-1ubuntu0.18.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-libusbredirparser1-0.7.1-1ubuntu0.18.04.1",
      "released": "2022-02-24T11:15:00Z"
    },
    {
      "platform": "linux",
      "product": "libusbredirparser1",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "0.8.0-1ubuntu0.1",
      "fix": "libusbredirparser1 0.8.0-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-libusbredirparser1-0.8.0-1ubuntu0.1",
      "released": "2022-02-24T11:15:00Z"
    },
    {
      "platform": "linux",
      "product": "usbredir",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "0.11.0-1",
      "fix": "DEBIAN-CVE-2021-3700",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3700",
      "released": "2022-02-24T19:15:09Z"
    },
    {
      "platform": "linux",
      "product": "usbredir",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "0.11.0-1",
      "fix": "DEBIAN-CVE-2021-3700",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3700",
      "released": "2022-02-24T19:15:09Z"
    },
    {
      "platform": "linux",
      "product": "usbredir",
      "release": "Debian 14",
      "fixedVersion": "0.11.0-1",
      "fix": "DEBIAN-CVE-2021-3700",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2021-3700",
      "released": "2022-02-24T19:15:09Z"
    },
    {
      "platform": "linux",
      "product": "usbredirserver",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "0.7.1-1ubuntu0.18.04.1",
      "fix": "usbredirserver 0.7.1-1ubuntu0.18.04.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-usbredirserver-0.7.1-1ubuntu0.18.04.1",
      "released": "2022-02-24T11:15:00Z"
    },
    {
      "platform": "linux",
      "product": "usbredirserver",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "0.8.0-1ubuntu0.1",
      "fix": "usbredirserver 0.8.0-1ubuntu0.1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-usbredirserver-0.8.0-1ubuntu0.1",
      "released": "2022-02-24T11:15:00Z"
    }
  ],
  "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"
  }
}