UBUNTU-CVE-2016-1547

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    UBUNTU-CVE-2016-1547

    Published: 29 Apr 2016Last Modified: 4 Feb 2026
    Upstream:
    CVE-2016-1547
    Aliases:
    USN-3096-1

    Summary:

    Details: An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled.

    References: https://ubuntu.com/security/CVE-2016-1547, http://support.ntp.org/bin/view/Main/SecurityNotice#April_2016_NTP_4_2_8p7_Security, https://ubuntu.com/security/notices/USN-3096-1, https://www.cve.org/CVERecord?id=CVE-2016-1547

    Affected packages

    Package

    Name: ntp

    Purl: pkg:deb/ubuntu/ntp@1:4.2.6.p5+dfsg-3ubuntu2.14.04.10?arch=source&distro=trusty

    Affected ranges

    Type: ECOSYSTEM

    Events:

    Introduced- 0
    Fixed -1:4.2.6.p5+dfsg-3ubuntu2.14.04.10

    Affected versions

    1:4.2.6.p5+dfsg-3ubuntu2
    1:4.2.6.p5+dfsg-3ubuntu2.14.04.1
    1:4.2.6.p5+dfsg-3ubuntu2.14.04.2
    1:4.2.6.p5+dfsg-3ubuntu2.14.04.3
    1:4.2.6.p5+dfsg-3ubuntu2.14.04.5
    1:4.2.6.p5+dfsg-3ubuntu2.14.04.6
    1:4.2.6.p5+dfsg-3ubuntu2.14.04.7
    1:4.2.6.p5+dfsg-3ubuntu2.14.04.8

    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