CVE-2016-7427

Name: CVE-2016-7427
Creator: NVD / NIST
Published: 2017-01-13T16:59:00.357+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

UnknownEPSS 3.91%

Last modified Jun 17, 2026

CVE-2016-7427 is a vulnerability of currently unknown severity. The broadcast mode replay prevention functionality in ntpd in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (reject broadcast mode packets) via a crafted broadcast mode packet.. EPSS estimates a 3.91% chance of exploitation in the next 30 days.

Description

The broadcast mode replay prevention functionality in ntpd in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (reject broadcast mode packets) via a crafted broadcast mode packet.

Metrics

EPSS Probability

3.91%

88.9th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-400

Affected Software

Vendor	Product	Versions	Update
Ntp	Ntp	4.2.8	P6

References

http://nwtime.org/ntp428p9_release/Release Notes, Vendor Advisory
http://support.ntp.org/bin/view/Main/NtpBug3114Issue Tracking, Mitigation, Vendor Advisory
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_VulnerabilitiesVendor Advisory
http://www.securityfocus.com/bid/94447Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037354
https://bto.bluecoat.com/security-advisory/sa139
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03883en_us
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03899en_us
https://usn.ubuntu.com/3707-2/
https://www.kb.cert.org/vuls/id/633847Third Party Advisory, US Government Resource
http://nwtime.org/ntp428p9_release/Release Notes, Vendor Advisory
http://support.ntp.org/bin/view/Main/NtpBug3114Issue Tracking, Mitigation, Vendor Advisory
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_VulnerabilitiesVendor Advisory
http://www.securityfocus.com/bid/94447Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037354
https://bto.bluecoat.com/security-advisory/sa139
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03883en_us
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03899en_us
https://usn.ubuntu.com/3707-2/
https://www.kb.cert.org/vuls/id/633847Third Party Advisory, US Government Resource

Timeline

Published: Jan 13, 2017
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2016-7427?

How severe is CVE-2016-7427?

Severity scoring for CVE-2016-7427 is pending analysis. The EPSS model estimates a 3.91% probability of exploitation in the next 30 days.

How do I fix CVE-2016-7427?

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-2016-7427?

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

Scan your code now

Source: NVD / NIST