CVE-2020-11868

Name: CVE-2020-11868
Creator: NVD / NIST
Published: 2020-04-17T04:15:10.987+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 2.08%

Last modified Jun 17, 2026

CVE-2020-11868 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated synchronization via a server mode packet with a spoofed source IP address, because transmissions are rescheduled even when a packet lacks a valid origin timestamp.. EPSS estimates a 2.08% chance of exploitation in the next 30 days.

Description

ntpd in ntp before 4.2.8p14 and 4.3.x before 4.3.100 allows an off-path attacker to block unauthenticated synchronization via a server mode packet with a spoofed source IP address, because transmissions are rescheduled even when a packet lacks a valid origin timestamp.

Metrics

CVSS 3.1

7.5/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

EPSS Probability

2.08%

79.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Ntp	Ntp	<= 4.2.7
Ntp	Ntp	>= 4.3.98, < 4.3.100
Ntp	Ntp	4.2.8
Redhat	Enterprise Linux	7.0
Netapp	Data Ontap	All versions
Netapp	Hci Management Node	All versions
Netapp	Solidfire	All versions
Netapp	Vasa Provider For Clustered Data Ontap	>= 7.2
Netapp	Virtual Storage Console	>= 7.2
Netapp	Clustered Data Ontap	All versions
Netapp	Hci Storage Node Firmware	All versions
Netapp	Fabric-Attached Storage 8300 Firmware	All versions
Netapp	Fabric-Attached Storage 8700 Firmware	All versions
Netapp	Fabric-Attached Storage A400 Firmware	All versions
Netapp	All Flash Fabric-Attached Storage 8300 Firmware	All versions
Netapp	All Flash Fabric-Attached Storage 8700 Firmware	All versions
Netapp	All Flash Fabric-Attached Storage A400 Firmware	All versions
Debian	Debian Linux	8.0
Opensuse	Leap	15.1
Opensuse	Leap	15.2

References

http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.htmlMailing List, Third Party Advisory
http://support.ntp.org/bin/view/Main/NtpBug3592Patch, Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1716665Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00004.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202007-12Third Party Advisory
https://security.netapp.com/advisory/ntap-20200424-0002/Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.htmlMailing List, Third Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.htmlMailing List, Third Party Advisory
http://support.ntp.org/bin/view/Main/NtpBug3592Patch, Vendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1716665Issue Tracking, Third Party Advisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00004.htmlMailing List, Third Party Advisory
https://security.gentoo.org/glsa/202007-12Third Party Advisory
https://security.netapp.com/advisory/ntap-20200424-0002/Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.htmlPatch, Third Party Advisory

Timeline

Published: Apr 17, 2020
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2020-11868?

How severe is CVE-2020-11868?

CVE-2020-11868 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 2.08% probability of exploitation in the next 30 days.

How do I fix CVE-2020-11868?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2020-11868?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST