USN-4969-1

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    USN-4969-1

    Published: 27 May 2021Last Modified: 22 Apr 2026

    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: https://ubuntu.com/security/notices/USN-4969-1, https://ubuntu.com/security/CVE-2021-25217

    Affected packages

    Package

    Name: isc-dhcp

    Purl: pkg:deb/ubuntu/[email protected]?arch=source&distro=bionic

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.3.5-3ubuntu7.3

    Affected versions

    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

    Common Vulnerability Scoring System

    Attack Vector
    Network
    Adjacent
    Local
    Physical
    Privileges Required
    None
    Low
    High
    User Interaction
    None
    Required
    Scope
    Unchanged
    Changed
    Confidentiality
    None
    Low
    High
    Integrity
    None
    Low
    High
    Availability
    None
    Low
    High
    USN-4969-1 | CVE-DB