CVE-2016-7434

Name: CVE-2016-7434
Creator: NVD / NIST
Published: 2017-01-13T16:59:00.557+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

HIGHCVSS 7.5/10EPSS 52.94%

Last modified Jun 17, 2026

CVE-2016-7434 is a high-severity vulnerability rated 7.5/10 on the CVSS scale. The read_mru_list function in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (crash) via a crafted mrulist query.. EPSS estimates a 52.94% chance of exploitation in the next 30 days.

Description

The read_mru_list function in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (crash) via a crafted mrulist query.

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

52.94%

98.8th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-20

Affected Software

Vendor	Product	Versions	Update
Ntp	Ntp	>= 4.3.0, < 4.3.94	—
Ntp	Ntp	4.2.7	P100
Ntp	Ntp	4.2.8	—
Hpe	Hpux-Ntp	>= b.11.31, < c.4.2.8.2.0	—

References

http://nwtime.org/ntp428p9_release/Third Party Advisory
http://support.ntp.org/bin/view/Main/NtpBug3082Issue Tracking, Mitigation, Vendor Advisory
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_VulnerabilitiesRelease Notes, Vendor Advisory
http://www.securityfocus.com/bid/94448Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037354Third Party Advisory, VDB Entry
https://bto.bluecoat.com/security-advisory/sa139Third Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_usThird Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.ascThird Party Advisory
https://www.exploit-db.com/exploits/40806/Exploit, Third Party Advisory, VDB Entry
https://www.kb.cert.org/vuls/id/633847Third Party Advisory, US Government Resource
http://nwtime.org/ntp428p9_release/Third Party Advisory
http://support.ntp.org/bin/view/Main/NtpBug3082Issue Tracking, Mitigation, Vendor Advisory
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_VulnerabilitiesRelease Notes, Vendor Advisory
http://www.securityfocus.com/bid/94448Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037354Third Party Advisory, VDB Entry
https://bto.bluecoat.com/security-advisory/sa139Third Party Advisory
https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_usThird Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.ascThird Party Advisory
https://www.exploit-db.com/exploits/40806/Exploit, Third Party Advisory, VDB Entry
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-2016-7434?

The read_mru_list function in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (crash) via a crafted mrulist query.

How severe is CVE-2016-7434?

CVE-2016-7434 has a CVSS score of 7.5/10 (HIGH severity). The EPSS model estimates a 52.94% probability of exploitation in the next 30 days.

How do I fix CVE-2016-7434?

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-2016-7434?

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

Scan your code now

Source: NVD / NIST