USN-4969-1

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Source
https://ubuntu.com/security/notices/USN-4969-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-4969-1.json
JSON Data
https://api.test.osv.dev/v1/vulns/USN-4969-1
Upstream
Related
Published
2021-05-27T10:41:47.440182Z
Modified
2025-10-13T04:35:30Z
Summary
isc-dhcp vulnerability
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

Affected packages

Ubuntu:18.04:LTS / isc-dhcp

Package

Name
isc-dhcp
Purl
pkg:deb/ubuntu/isc-dhcp@4.3.5-3ubuntu7.3?arch=source&distro=bionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.3.5-3ubuntu7.3

Affected versions

4.*

4.3.5-3ubuntu2
4.3.5-3ubuntu3
4.3.5-3ubuntu4
4.3.5-3ubuntu5
4.3.5-3ubuntu6
4.3.5-3ubuntu7
4.3.5-3ubuntu7.1
4.3.5-3ubuntu7.2

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.3.5-3ubuntu7.3",
            "binary_name": "isc-dhcp-client"
        },
        {
            "binary_version": "4.3.5-3ubuntu7.3",
            "binary_name": "isc-dhcp-client-ddns"
        },
        {
            "binary_version": "4.3.5-3ubuntu7.3",
            "binary_name": "isc-dhcp-common"
        },
        {
            "binary_version": "4.3.5-3ubuntu7.3",
            "binary_name": "isc-dhcp-dev"
        },
        {
            "binary_version": "4.3.5-3ubuntu7.3",
            "binary_name": "isc-dhcp-relay"
        },
        {
            "binary_version": "4.3.5-3ubuntu7.3",
            "binary_name": "isc-dhcp-server"
        },
        {
            "binary_version": "4.3.5-3ubuntu7.3",
            "binary_name": "isc-dhcp-server-ldap"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:18.04:LTS",
    "cves": [
        {
            "id": "CVE-2021-25217",
            "severity": [
                {
                    "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": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}

Ubuntu:20.04:LTS / isc-dhcp

Package

Name
isc-dhcp
Purl
pkg:deb/ubuntu/isc-dhcp@4.4.1-2.1ubuntu5.20.04.2?arch=source&distro=focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.4.1-2.1ubuntu5.20.04.2

Affected versions

4.*

4.4.1-2ubuntu5
4.4.1-2ubuntu6
4.4.1-2.1ubuntu1
4.4.1-2.1ubuntu2
4.4.1-2.1ubuntu3
4.4.1-2.1ubuntu4
4.4.1-2.1ubuntu5
4.4.1-2.1ubuntu5.20.04.1

Ecosystem specific 

{
    "binaries": [
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.2",
            "binary_name": "isc-dhcp-client"
        },
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.2",
            "binary_name": "isc-dhcp-client-ddns"
        },
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.2",
            "binary_name": "isc-dhcp-common"
        },
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.2",
            "binary_name": "isc-dhcp-dev"
        },
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.2",
            "binary_name": "isc-dhcp-relay"
        },
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.2",
            "binary_name": "isc-dhcp-server"
        },
        {
            "binary_version": "4.4.1-2.1ubuntu5.20.04.2",
            "binary_name": "isc-dhcp-server-ldap"
        }
    ],
    "availability": "No subscription required"
}

Database specific

cves_map

{
    "ecosystem": "Ubuntu:20.04:LTS",
    "cves": [
        {
            "id": "CVE-2021-25217",
            "severity": [
                {
                    "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": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:C/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ]
}