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Vulnerability record · CVE-2020-11868 · published 17 April 2020

CVE-2020-11868: Ntp origin validation error vulnerability

Ntp · Ntp

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.

7.5 CVSS 3.1 High EPSS 2.1% · top 18.8% CWE-346 · Origin validation error
7.5CVSS 3.1 base score, v2 5.0
2.1%EPSS exploitation probability, 30 days
NoNot in CISA KEV
17Affected product versions listed by NVD
16References
17 Jun 2026Last modified by NVD

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.

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

Affected products

17 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.html Mailing ListThird Party Advisory
http://support.ntp.org/bin/view/Main/NtpBug3592 PatchVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1716665 Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00004.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202007-12 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200424-0002/ Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.html PatchThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00005.html Mailing ListThird Party Advisory
http://lists.opensuse.org/opensuse-security-announce/2020-07/msg00044.html Mailing ListThird Party Advisory
http://support.ntp.org/bin/view/Main/NtpBug3592 PatchVendor Advisory
https://bugzilla.redhat.com/show_bug.cgi?id=1716665 Issue TrackingThird Party Advisory
https://lists.debian.org/debian-lts-announce/2020/05/msg00004.html Mailing ListThird Party Advisory
https://security.gentoo.org/glsa/202007-12 Third Party Advisory
https://security.netapp.com/advisory/ntap-20200424-0002/ Third Party Advisory
https://www.oracle.com//security-alerts/cpujul2021.html PatchThird Party Advisory

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Source: NIST National Vulnerability Database (record CVE-2020-11868), CISA KEV, FIRST EPSS (scores of 2026-10-01). This page is refreshed as NVD updates the record.