UBUNTU-CVE-2018-5733

    Dashboard / Vulnerabilities / UBUNTU-CVE-2018-5733

    UBUNTU-CVE-2018-5733

    Published: 1 Mar 2018Last Modified: 22 Apr 2026
    Upstream:
    CVE-2018-5733

    Summary:

    Details: A malicious client which is allowed to send very large amounts of traffic (billions of packets) to a DHCP server can eventually overflow a 32-bit reference counter, potentially causing dhcpd to crash. Affects ISC DHCP 4.1.0 -> 4.1-ESV-R15, 4.2.0 -> 4.2.8, 4.3.0 -> 4.3.6, 4.4.0.

    References: https://ubuntu.com/security/CVE-2018-5733, https://kb.isc.org/article/AA-01567/75/CVE-2018-5733, https://ubuntu.com/security/notices/USN-3586-1, https://ubuntu.com/security/notices/USN-3586-2, https://www.cve.org/CVERecord?id=CVE-2018-5733

    Affected packages

    Package

    Name: isc-dhcp

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

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -4.2.4-7ubuntu12.12

    Affected 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

    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