What is CVE-2016-7434?

CVE-2016-7434 is a high-severity vulnerability in HPE Hpux-Ntp, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2017-01-13.

How severe is CVE-2016-7434?

High severity. CVSS v3 base score is 7.5 out of 10.

Is CVE-2016-7434 known to be exploited?

9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Improper input validation in HPE Hpux-Ntp

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.

Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)

Published 2017-01-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.531 (99.0th percentile), scored 2026-10-18.

High probability of exploitation in the next 30 days — patch promptly. 99th percentile — 99.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.529 · newest: 0.531 · change: +0.002

Affected products

HPE Hpux-Ntp
NTP — versions 4.2.7, 4.2.8

Weakness classification (CWE)

CWE-20 — Improper Input Validation

Public proof-of-concept exploits

References

h20566.www2.hpe.com/hpsc/doc/public/display (Third Party Advisory)
www.securityfocus.com/bid/94448 (VDB Entry, Third Party Advisory, vdb-entry)
support.ntp.org/bin/view/Main/NtpBug3082 (Mitigation, Issue Tracking, Vendor Advisory)
www.exploit-db.com/exploits/40806/ (Exploit, VDB Entry, Third Party Advisory, exploit)
support.ntp.org/bin/view/Main/SecurityNotice (Release Notes, Vendor Advisory)
nwtime.org/ntp428p9_release/ (Third Party Advisory)
www.kb.cert.org/vuls/id/633847 (US Government Resource, Third Party Advisory, third-party-advisory)
www.securitytracker.com/id/1037354 (VDB Entry, Third Party Advisory, vdb-entry)
bto.bluecoat.com/security-advisory/sa139 (Third Party Advisory)
security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.asc (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2016-7434?: CVE-2016-7434 is a high-severity vulnerability in HPE Hpux-Ntp, classified under Improper Input Validation. CVSS score: 7.5/10. Published 2017-01-13.
How severe is CVE-2016-7434?: High severity. CVSS v3 base score is 7.5 out of 10.
Is CVE-2016-7434 known to be exploited?: 9 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.