{
  "cveId": "CVE-2021-3448",
  "url": "https://patchblox.com/security/cve/CVE-2021-3448",
  "summary": "CVE-2021-3448 is fixed in 4 products on 1 platform, first by dnsmasq 2.79-1ubuntu0.4, released April 8, 2021. It is not reported as exploited. Patch Radar priority: Routine.",
  "title": "dnsmasq: A flaw was found in dnsmasq in versions before 2.85",
  "description": "A flaw was found in dnsmasq in versions before 2.85. When configured to usea specific server for a given network interface, dnsmasq uses a fixed portwhile forwarding queries. An attacker on the network, able to find theoutgoing port used by dnsmasq, only needs to guess the random transmissionID to forge a reply and get it accepted by dnsmasq. This flaw makes a DNSCache Poisoning attack much easier. The highest threat from thisvulnerability is to data integrity.",
  "published": "2021-04-08T16:15:00Z",
  "severity": "Low",
  "cvss": 4,
  "cvssVector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:N/I:L/A:N",
  "epss": 0.02283,
  "epssPercentile": 0.83261,
  "priority": "Routine",
  "priorityTier": 4,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "RHEL 8",
      "fixedVersion": "0:2.79-19.el8",
      "fix": "RHSA-2021:4153",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-4153",
      "released": "2021-11-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.79-1ubuntu0.4",
      "fix": "dnsmasq 2.79-1ubuntu0.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-dnsmasq-2.79-1ubuntu0.4",
      "released": "2021-04-08T16:15:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.80-1.1ubuntu1.4",
      "fix": "dnsmasq 2.80-1.1ubuntu1.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-dnsmasq-2.80-1.1ubuntu1.4",
      "released": "2021-04-08T16:15:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "2.85-1ubuntu1",
      "fix": "dnsmasq 2.85-1ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-dnsmasq-2.85-1ubuntu1",
      "released": "2026-01-16T01:42:22Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "2.85-1ubuntu1",
      "fix": "dnsmasq 2.85-1ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-dnsmasq-2.85-1ubuntu1",
      "released": "2026-01-16T01:42:24Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "almalinux 8",
      "fixedVersion": "2.79-19.el8",
      "fix": "ALSA-2021:4153",
      "url": "https://patchblox.com/security/fix/linux/alsa-2021-4153",
      "released": "2021-11-09T08:24:48Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "ol 8",
      "fixedVersion": "0:2.79-19.el8",
      "fix": "ELSA-2021-4153",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-4153",
      "released": "2021-11-16T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "rocky 8",
      "fixedVersion": "0:2.79-19.el8",
      "fix": "RLSA-2021:4153",
      "url": "https://patchblox.com/security/fix/linux/rlsa-2021-4153",
      "released": "2021-11-09T08:24:48Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.79-1ubuntu0.4",
      "fix": "dnsmasq-base 2.79-1ubuntu0.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-dnsmasq-base-2.79-1ubuntu0.4",
      "released": "2021-04-08T16:15:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.80-1.1ubuntu1.4",
      "fix": "dnsmasq-base 2.80-1.1ubuntu1.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-dnsmasq-base-2.80-1.1ubuntu1.4",
      "released": "2021-04-08T16:15:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "2.85-1ubuntu1",
      "fix": "dnsmasq-base 2.85-1ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-dnsmasq-base-2.85-1ubuntu1",
      "released": "2026-01-16T01:42:22Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "2.85-1ubuntu1",
      "fix": "dnsmasq-base 2.85-1ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-dnsmasq-base-2.85-1ubuntu1",
      "released": "2026-01-16T01:42:24Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base-lua",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.79-1ubuntu0.4",
      "fix": "dnsmasq-base-lua 2.79-1ubuntu0.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-dnsmasq-base-lua-2.79-1ubuntu0.4",
      "released": "2021-04-08T16:15:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base-lua",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.80-1.1ubuntu1.4",
      "fix": "dnsmasq-base-lua 2.80-1.1ubuntu1.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-dnsmasq-base-lua-2.80-1.1ubuntu1.4",
      "released": "2021-04-08T16:15:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base-lua",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "2.85-1ubuntu1",
      "fix": "dnsmasq-base-lua 2.85-1ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-dnsmasq-base-lua-2.85-1ubuntu1",
      "released": "2026-01-16T01:42:22Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base-lua",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "2.85-1ubuntu1",
      "fix": "dnsmasq-base-lua 2.85-1ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-dnsmasq-base-lua-2.85-1ubuntu1",
      "released": "2026-01-16T01:42:24Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "RHEL 8",
      "fixedVersion": "0:2.79-19.el8",
      "fix": "RHSA-2021:4153",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-4153",
      "released": "2021-11-09T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.79-1ubuntu0.4",
      "fix": "dnsmasq-utils 2.79-1ubuntu0.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-dnsmasq-utils-2.79-1ubuntu0.4",
      "released": "2021-04-08T16:15:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.80-1.1ubuntu1.4",
      "fix": "dnsmasq-utils 2.80-1.1ubuntu1.4",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-dnsmasq-utils-2.80-1.1ubuntu1.4",
      "released": "2021-04-08T16:15:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "2.85-1ubuntu1",
      "fix": "dnsmasq-utils 2.85-1ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-dnsmasq-utils-2.85-1ubuntu1",
      "released": "2026-01-16T01:42:22Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "2.85-1ubuntu1",
      "fix": "dnsmasq-utils 2.85-1ubuntu1",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-dnsmasq-utils-2.85-1ubuntu1",
      "released": "2026-01-16T01:42:24Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "almalinux 8",
      "fixedVersion": "2.79-19.el8",
      "fix": "ALSA-2021:4153",
      "url": "https://patchblox.com/security/fix/linux/alsa-2021-4153",
      "released": "2021-11-09T08:24:48Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "ol 8",
      "fixedVersion": "0:2.79-19.el8",
      "fix": "ELSA-2021-4153",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-4153",
      "released": "2021-11-16T00:00:00Z"
    }
  ],
  "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"
  }
}