{
  "cveId": "CVE-2020-25683",
  "url": "https://patchblox.com/security/cve/CVE-2020-25683",
  "summary": "CVE-2020-25683 is fixed in 4 products on 1 platform, first by dnsmasq 2.79-1ubuntu0.2, released January 18, 2021. It is not reported as exploited. Patch Radar priority: High.",
  "title": "dnsmasq: A flaw was found in dnsmasq before version 2.83",
  "description": "A flaw was found in dnsmasq before version 2.83. A heap-based bufferoverflow was discovered in dnsmasq when DNSSEC is enabled and before itvalidates the received DNS entries. A remote attacker, who can create validDNS replies, could use this flaw to cause an overflow in a heap-allocatedmemory. This flaw is caused by the lack of length checks inrfc1035.c:extract_name(), which could be abused to make the code executememcpy() with a negative size in get_rdata() and cause a crash in dnsmasq,resulting in a denial of service. The highest threat from thisvulnerability is to system availability.",
  "published": "2021-01-18T16:00:00Z",
  "severity": "Medium",
  "cvss": 7.5,
  "epss": 0.88775,
  "epssPercentile": 0.99777,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "RHEL 8",
      "fixedVersion": "0:2.79-13.el8_3.1",
      "fix": "RHSA-2021:0150",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-0150",
      "released": "2021-01-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.79-1ubuntu0.2",
      "fix": "dnsmasq 2.79-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-dnsmasq-2.79-1ubuntu0.2",
      "released": "2021-01-18T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.80-1.1ubuntu1.2",
      "fix": "dnsmasq 2.80-1.1ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-dnsmasq-2.80-1.1ubuntu1.2",
      "released": "2021-01-18T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "2.82-1ubuntu2",
      "fix": "dnsmasq 2.82-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-dnsmasq-2.82-1ubuntu2",
      "released": "2021-01-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "2.82-1ubuntu2",
      "fix": "dnsmasq 2.82-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-dnsmasq-2.82-1ubuntu2",
      "released": "2021-01-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq",
      "release": "ol 8",
      "fixedVersion": "0:2.79-13.el8_3.1",
      "fix": "ELSA-2021-0150",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-0150",
      "released": "2021-01-20T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.79-1ubuntu0.2",
      "fix": "dnsmasq-base 2.79-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-dnsmasq-base-2.79-1ubuntu0.2",
      "released": "2021-01-18T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.80-1.1ubuntu1.2",
      "fix": "dnsmasq-base 2.80-1.1ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-dnsmasq-base-2.80-1.1ubuntu1.2",
      "released": "2021-01-18T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "2.82-1ubuntu2",
      "fix": "dnsmasq-base 2.82-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-dnsmasq-base-2.82-1ubuntu2",
      "released": "2021-01-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "2.82-1ubuntu2",
      "fix": "dnsmasq-base 2.82-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-dnsmasq-base-2.82-1ubuntu2",
      "released": "2021-01-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base-lua",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.79-1ubuntu0.2",
      "fix": "dnsmasq-base-lua 2.79-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-dnsmasq-base-lua-2.79-1ubuntu0.2",
      "released": "2021-01-18T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base-lua",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.80-1.1ubuntu1.2",
      "fix": "dnsmasq-base-lua 2.80-1.1ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-dnsmasq-base-lua-2.80-1.1ubuntu1.2",
      "released": "2021-01-18T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base-lua",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "2.82-1ubuntu2",
      "fix": "dnsmasq-base-lua 2.82-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-dnsmasq-base-lua-2.82-1ubuntu2",
      "released": "2021-01-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-base-lua",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "2.82-1ubuntu2",
      "fix": "dnsmasq-base-lua 2.82-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-dnsmasq-base-lua-2.82-1ubuntu2",
      "released": "2021-01-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "RHEL 8",
      "fixedVersion": "0:2.79-13.el8_3.1",
      "fix": "RHSA-2021:0150",
      "url": "https://patchblox.com/security/fix/linux/rhsa-2021-0150",
      "released": "2021-01-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "Ubuntu 18.04.6 LTS (bionic)",
      "fixedVersion": "2.79-1ubuntu0.2",
      "fix": "dnsmasq-utils 2.79-1ubuntu0.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-bionic-dnsmasq-utils-2.79-1ubuntu0.2",
      "released": "2021-01-18T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "Ubuntu 20.04 LTS (focal)",
      "fixedVersion": "2.80-1.1ubuntu1.2",
      "fix": "dnsmasq-utils 2.80-1.1ubuntu1.2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-focal-dnsmasq-utils-2.80-1.1ubuntu1.2",
      "released": "2021-01-18T16:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "Ubuntu 24.10 (oracular)",
      "fixedVersion": "2.82-1ubuntu2",
      "fix": "dnsmasq-utils 2.82-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-oracular-dnsmasq-utils-2.82-1ubuntu2",
      "released": "2021-01-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "Ubuntu 25.04 (plucky)",
      "fixedVersion": "2.82-1ubuntu2",
      "fix": "dnsmasq-utils 2.82-1ubuntu2",
      "url": "https://patchblox.com/security/fix/linux/ubuntu-plucky-dnsmasq-utils-2.82-1ubuntu2",
      "released": "2021-01-19T00:00:00Z"
    },
    {
      "platform": "linux",
      "product": "dnsmasq-utils",
      "release": "ol 8",
      "fixedVersion": "0:2.79-13.el8_3.1",
      "fix": "ELSA-2021-0150",
      "url": "https://patchblox.com/security/fix/linux/elsa-2021-0150",
      "released": "2021-01-20T00:00:00Z"
    }
  ],
  "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"
  }
}