Is CVE-2014-9751 in the CISA KEV catalog?

No. CVE-2014-9751 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2014-9751?

CVE-2014-9751 has a CVSS v2 base score of 6.8 (MEDIUM).

What is the EPSS score for CVE-2014-9751?

CVE-2014-9751 has an EPSS score of 4.53% (90th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2014-9751?

Upgrade ntp on debian 11 to 1:4.2.6.p5+dfsg-4 or later.

CVE & CISA-KEV Catalog

CVE-2014-9751

MEDIUMEPSS 90th pctl

6.8

CVSS v2

NVD

Description

The read_network_packet function in ntp_io.c in ntpd in NTP 4.x before 4.2.8p1 on Linux and OS X does not properly determine whether a source IP address is an IPv6 loopback address, which makes it easier for remote attackers to spoof restricted packets, and read or write to the runtime state, by leveraging the ability to reach the ntpd machine's network interface with a packet from the ::1 address.

CWE-20Improper Input Validation

How to fix

Remediation Available

ntpDebian

Fixed in:1:4.2.6.p5+dfsg-4CVE-2014-9751

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v2 Vector

No CVSS vector data available.

Exploit Intelligence

4.53%probability of exploitation in 30 days

90thpercentile

High risk: more likely to be exploited than 90% of all known CVEs.

References

Patch1

bugs.ntp.org

Vendor Advisory1

support.ntp.org

Third-Party Advisory7

Related Vulnerabilities

Other CWE-20 (Improper Input Validation) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-3400	Critical	10.0	100%	KEV + Ransom	-
CVE-2021-45105	Medium	5.9	100%	-	Fix
CVE-2021-44228	Critical	10.0	100%	KEV + Ransom	Fix
CVE-2021-21985	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2018-7600	Critical	9.8	100%	KEV + Ransom	Fix
CVE-2020-3452	High	7.5	100%	KEV	Fix

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.