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CVE-2016-7433

24
FAUCET Score

CVE-2016-7433 describes a vulnerability in NTP before version 4.2.8p9, where improper initial sync calculations, specifically regarding root distance and peer dispersion, could lead to an unspecified impact. This medium-severity vulnerability (CVSS 5.3) is network-exploitable with low attack complexity, requiring no user interaction or privileges, and primarily impacts availability. There is no evidence of active exploitation, publicly available exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion or media coverage surrounding this CVE.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:p8:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

5.3MEDIUM

CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
LOW
Exploitability Score
3.9
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
9.84%
Probability of exploitation in next 30 days
EPSS Percentile
95.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0984 is in the 94th percentile among its peer group of 23,701 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (2)

redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 6Fixed in: ntp-0:4.2.6p5-10.el6_8.2
View patch
redhatpatch availablevia redhat_api
Product: Red Hat Enterprise Linux 7Fixed in: ntp-0:4.2.6p5-25.el7_3.1
View patch

Vendor Advisories (1)

redhatCVE-2016-7433Low

ntp: Broken initial sync calculations regression

Nov 21, 2016

References

lists.opensuse.org / opensuse-updates/2016-12/msg00153.html
nwtime.org / ntp428p9_release
Release NotesVendor Advisory
rhn.redhat.com / errata/RHSA-2017-0252.html
bto.bluecoat.com / security-advisory/sa139
cert-portal.siemens.com / productcert/pdf/ssa-211752.pdf
h20566.www2.hpe.com / hpsc/doc/public/display
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/ILMSYVQMMF37MANYEO7KBHOPSC74EKGN
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/PABKEYX6ABBFJZGMXKH57X756EJUDS3C
lists.fedoraproject.org / archives/list/package-announce%40lists.fedoraproject.org/message/U5E3XBBCK5IXOLDAH2E4M3QKIYIHUMMP
security.freebsd.org / advisories/FreeBSD-SA-16:39.ntp.asc
support.ntp.org / bin/view/Main/NtpBug3067
Issue TrackingMitigationVendor Advisory
support.ntp.org / bin/view/Main/SecurityNotice
Vendor Advisory
us-cert.cisa.gov / ics/advisories/icsa-21-159-11
broadcom.com / support/fibre-channel-networking/security-advisories/brocade-security-advisory-2017-227
broadcom.com / support/fibre-channel-networking/security-advisories/brocade-security-advisory-2017-227
kb.cert.org / vuls/id/633847
Third Party AdvisoryUS Government Resource
huawei.com / en/psirt/security-advisories/huawei-sa-20171129-01-ntpd-en
oracle.com / technetwork/security-advisory/cpuoct2017-3236626.html
securityfocus.com / archive/1/539955/100/0/threaded
securityfocus.com / archive/1/540254/100/0/threaded
securityfocus.com / archive/1/archive/1/539955/100/0/threaded
securityfocus.com / archive/1/archive/1/540254/100/0/threaded
securityfocus.com / bid/94455
securitytracker.com / id/1037354
ubuntu.com / usn/USN-3349-1