Is CVE-2016-4954 in the CISA KEV catalog?

No. CVE-2016-4954 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-4954?

CVE-2016-4954 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2016-4954?

CVE-2016-4954 has an EPSS score of 13.21% (96th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-4954?

Upgrade ntp on debian 11 to 1:4.2.8p8+dfsg-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2016-4954

HIGHEPSS 96th pctl

7.5

CVSS v3

NVD

Description

The process_packet function in ntp_proto.c in ntpd in NTP 4.x before 4.2.8p8 allows remote attackers to cause a denial of service (peer-variable modification) by sending spoofed packets from many source IP addresses in a certain scenario, as demonstrated by triggering an incorrect leap indication.

CWE-362Race Condition

How to fix

Remediation Available

ntpDebian

Fixed in:1:4.2.8p8+dfsg-1CVE-2016-4954

ntpUbuntu

Fixed in:1:4.2.6.p5+dfsg-3ubuntu2.14.04.10USN-3096-1

Fixed in:1:4.2.8p4+dfsg-3ubuntu5.3USN-3096-1

TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works

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

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityNone

AvailabilityHigh

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Exploit Intelligence

13.21%probability of exploitation in 30 days

96thpercentile

Very high risk: more likely to be exploited than 96% of all known CVEs.

References

Related Vulnerabilities

Other CWE-362 (Race Condition) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-6387	High	8.1	100%	-	Fix
CVE-2023-36884	High	7.5	99%	KEV + Ransom	Fix
CVE-2018-15473	Medium	5.3	99%	-	Fix
CVE-2024-27983	High	8.2	87%	-	Fix
CVE-2014-0226	Medium	6.8	86%	-	Fix
CVE-2016-5195	High	7.0	84%	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.