high
7.5
CWE
346
Advisory Published
CVE Published
Updated

CVE-2020-11868

First published: Mon Jun 03 2019(Updated: )

NTP is vulnerable to a denial of service, caused by a flaw in ntpd. By sending a server mode packet with a spoofed source IP address, a remote attacker could exploit this vulnerability to block unauthenticated synchronization resulting in a denial of service condition.

Credit: cve@mitre.org

Affected SoftwareAffected VersionHow to fix
redhat/ntp<4.2.8
4.2.8
redhat/ntp<4.3.100
4.3.100
IBM Data Risk Manager<=2.0.6
NTP<=4.2.7
NTP>=4.3.98<4.3.100
NTP=4.2.8
NTP=4.2.8-p1
NTP=4.2.8-p1-beta1
NTP=4.2.8-p1-beta2
NTP=4.2.8-p1-beta3
NTP=4.2.8-p1-beta4
NTP=4.2.8-p1-beta5
NTP=4.2.8-p1-rc1
NTP=4.2.8-p1-rc2
NTP=4.2.8-p10
NTP=4.2.8-p11
NTP=4.2.8-p12
NTP=4.2.8-p13
NTP=4.2.8-p2
NTP=4.2.8-p2-rc1
NTP=4.2.8-p2-rc2
NTP=4.2.8-p2-rc3
NTP=4.2.8-p3
NTP=4.2.8-p3-rc1
NTP=4.2.8-p3-rc2
NTP=4.2.8-p3-rc3
NTP=4.2.8-p4
NTP=4.2.8-p5
NTP=4.2.8-p6
NTP=4.2.8-p7
NTP=4.2.8-p8
NTP=4.2.8-p9
Red Hat Enterprise Linux=7.0
IBM Data ONTAP
NetApp SolidFire & HCI Management Node
NetApp SolidFire & HCI Storage Node
NetApp VASA Provider>=7.2
NetApp VASA Provider for Clustered Data ONTAP>=7.2
NetApp Virtual Storage Console for VMware vSphere>=7.2
IBM Data ONTAP
NetApp HCI Storage Nodes
NetApp HCI Storage Nodes
NetApp Fabric-Attached Storage 8300 Firmware
NetApp All Flash Fabric-Attached Storage 8300
NetApp All Flash Fabric-Attached Storage 8700 Firmware
NetApp Fabric-Attached Storage 8700
NetApp Fabric-Attached Storage A400 Firmware
NetApp Fabric-Attached Storage A400 Firmware
NetApp Fabric-Attached Storage 8300 Firmware
NetApp All Flash Fabric-Attached Storage 8300 Firmware
NetApp All Flash Fabric-Attached Storage 8700 Firmware
NetApp Fabric-Attached Storage 8700
NetApp Fabric-Attached Storage A400 Firmware
NetApp Fabric-Attached Storage A400
Debian Linux=8.0
SUSE Linux=15.1
SUSE Linux=15.2

Remedy

http://support.ntp.org/bin/view/Main/NtpBug3592

Remedy

https://www.oracle.com//security-alerts/cpujul2021.html

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

Reference Links

Parent vulnerabilities

(Appears in the following advisories)

Frequently Asked Questions

  • What is CVE-2020-11868?

    CVE-2020-11868 is a vulnerability in ntpd that allows an off-path attacker to block unauthenticated synchronization.

  • Which versions of ntp are affected by CVE-2020-11868?

    ntpd versions before 4.2.8p14 and 4.3.x before 4.3.100 are affected.

  • How does CVE-2020-11868 allow an attacker to block unauthenticated synchronization?

    The attacker can use a server mode packet with a spoofed source IP address, which causes transmissions to be rescheduled even without a valid origin timestamp.

  • What is the severity of CVE-2020-11868?

    CVE-2020-11868 has a severity score of 7.5 (high).

  • Where can I find more information about CVE-2020-11868?

    More information about CVE-2020-11868 can be found in the references: [Bugzilla Red Hat](https://bugzilla.redhat.com/show_bug.cgi?id=1716661), [NTP Bug 3592](http://support.ntp.org/bin/view/Main/NtpBug3592), [Bugzilla Red Hat](https://bugzilla.redhat.com/show_bug.cgi?id=1824831).

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2025 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203