CVE catalog

CVE-2016-7433

UBUNTU-CVE-2016-7433

Severity: Medium · CVSS 5.3CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published: Nov 21, 2016, 12:00:00 AM UTC
Updated: Aug 4, 2026, 6:04:08 AM UTC
Source: [NVD] · [CVE record]
EPSS: 9.76% · Oct 25, 2026

NTP before 4.2.8p9 does not properly perform the initial sync calculations, which allows remote attackers to unspecified impact via unknown vectors, related to a "root distance that did not include the peer dispersion."

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	ntp	11	`1:4.2.8p9+dfsg-1`	fixed
Ubuntu	ntp	16.04	`1:4.2.6.p5+dfsg-3ubuntu8`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.6.p5+dfsg-3ubuntu8.1`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.6.p5+dfsg-3ubuntu9`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu1`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu2`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu3`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu4`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.1`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.2`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.3`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.4`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.5`	fixed

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	ntp	deb	11	`1:4.2.8p9+dfsg-1`	Not reported	DEBIAN-CVE-2016-7433	Not reported
Ubuntu	ntp	deb	16.04	`1:4.2.8p4+dfsg-3ubuntu5.5`	Not reported	UBUNTU-CVE-2016-7433	Not reported

OpenFactory catalog packages

No matching packages in this catalog.

Observed: Oct 23, 2026, 5:23:04 PM UTC

References

[FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [SUSE security advisories and VEX]