usn-4969-2
Vulnerability from osv_ubuntu
Published
2021-05-27 12:07
Modified
2026-06-29 10:52
Summary
isc-dhcp vulnerability
Details

USN-4969-1 fixed a vulnerability in DHCP. This update provides the corresponding update for Ubuntu 14.04 ESM and 16.04 ESM.

Original advisory details:

Jon Franklin and Pawel Wieczorkiewicz discovered that DHCP incorrectly handled lease file parsing. A remote attacker could possibly use this issue to cause DHCP to crash, resulting in a denial of service.

References
To clipboard 

{
  "affected": [
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-25217",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:14.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "isc-dhcp-client",
            "binary_version": "4.2.4-7ubuntu12.13+esm1"
          },
          {
            "binary_name": "isc-dhcp-client-noddns",
            "binary_version": "4.2.4-7ubuntu12.13+esm1"
          },
          {
            "binary_name": "isc-dhcp-common",
            "binary_version": "4.2.4-7ubuntu12.13+esm1"
          },
          {
            "binary_name": "isc-dhcp-relay",
            "binary_version": "4.2.4-7ubuntu12.13+esm1"
          },
          {
            "binary_name": "isc-dhcp-server",
            "binary_version": "4.2.4-7ubuntu12.13+esm1"
          },
          {
            "binary_name": "isc-dhcp-server-ldap",
            "binary_version": "4.2.4-7ubuntu12.13+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:14.04:LTS",
        "name": "isc-dhcp",
        "purl": "pkg:deb/ubuntu/isc-dhcp@4.2.4-7ubuntu12.13+esm1?arch=source\u0026distro=trusty/esm"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.2.4-7ubuntu12.13+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.2.4-7ubuntu8",
        "4.2.4-7ubuntu9",
        "4.2.4-7ubuntu10",
        "4.2.4-7ubuntu11",
        "4.2.4-7ubuntu12",
        "4.2.4-7ubuntu12.1",
        "4.2.4-7ubuntu12.2",
        "4.2.4-7ubuntu12.3",
        "4.2.4-7ubuntu12.4",
        "4.2.4-7ubuntu12.5",
        "4.2.4-7ubuntu12.6",
        "4.2.4-7ubuntu12.7",
        "4.2.4-7ubuntu12.8",
        "4.2.4-7ubuntu12.9",
        "4.2.4-7ubuntu12.10",
        "4.2.4-7ubuntu12.12",
        "4.2.4-7ubuntu12.13"
      ]
    },
    {
      "database_specific": {
        "cves_map": {
          "cves": [
            {
              "id": "CVE-2021-25217",
              "severity": [
                {
                  "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H",
                  "type": "CVSS_V3"
                },
                {
                  "score": "medium",
                  "type": "Ubuntu"
                }
              ]
            }
          ],
          "ecosystem": "Ubuntu:Pro:16.04:LTS"
        }
      },
      "ecosystem_specific": {
        "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
        "binaries": [
          {
            "binary_name": "isc-dhcp-client",
            "binary_version": "4.3.3-5ubuntu12.10+esm1"
          },
          {
            "binary_name": "isc-dhcp-client-ddns",
            "binary_version": "4.3.3-5ubuntu12.10+esm1"
          },
          {
            "binary_name": "isc-dhcp-common",
            "binary_version": "4.3.3-5ubuntu12.10+esm1"
          },
          {
            "binary_name": "isc-dhcp-relay",
            "binary_version": "4.3.3-5ubuntu12.10+esm1"
          },
          {
            "binary_name": "isc-dhcp-server",
            "binary_version": "4.3.3-5ubuntu12.10+esm1"
          },
          {
            "binary_name": "isc-dhcp-server-ldap",
            "binary_version": "4.3.3-5ubuntu12.10+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:16.04:LTS",
        "name": "isc-dhcp",
        "purl": "pkg:deb/ubuntu/isc-dhcp@4.3.3-5ubuntu12.10+esm1?arch=source\u0026distro=esm-infra/xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "4.3.3-5ubuntu12.10+esm1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "4.3.1-5ubuntu3",
        "4.3.1-5ubuntu4",
        "4.3.1-5ubuntu5",
        "4.3.3-5ubuntu1",
        "4.3.3-5ubuntu2",
        "4.3.3-5ubuntu4",
        "4.3.3-5ubuntu5",
        "4.3.3-5ubuntu7",
        "4.3.3-5ubuntu8",
        "4.3.3-5ubuntu9",
        "4.3.3-5ubuntu10",
        "4.3.3-5ubuntu11",
        "4.3.3-5ubuntu12",
        "4.3.3-5ubuntu12.1",
        "4.3.3-5ubuntu12.3",
        "4.3.3-5ubuntu12.4",
        "4.3.3-5ubuntu12.6",
        "4.3.3-5ubuntu12.7",
        "4.3.3-5ubuntu12.9",
        "4.3.3-5ubuntu12.10"
      ]
    }
  ],
  "aliases": [],
  "details": "USN-4969-1 fixed a vulnerability in DHCP. This update provides\nthe corresponding update for Ubuntu 14.04 ESM and 16.04 ESM.\n\n\nOriginal advisory details:\n\n Jon Franklin and Pawel Wieczorkiewicz discovered that DHCP incorrectly\n handled lease file parsing. A remote attacker could possibly use this issue\n to cause DHCP to crash, resulting in a denial of service.\n",
  "id": "USN-4969-2",
  "modified": "2026-06-29T10:52:50Z",
  "published": "2021-05-27T12:07:22Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://ubuntu.com/security/notices/USN-4969-2"
    },
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2021-25217"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "summary": "isc-dhcp vulnerability",
  "upstream": [
    "UBUNTU-CVE-2021-25217"
  ]
}



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