Is CVE-2016-4957 in the CISA KEV catalog?

No. CVE-2016-4957 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-4957?

CVE-2016-4957 has a CVSS v3 base score of 7.5 (HIGH).

What is the EPSS score for CVE-2016-4957?

CVE-2016-4957 has an EPSS score of 44.94% (99th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-4957?

Upgrade ntp on debian 11 to 1:4.2.8p8+dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2016-4957

HIGHEPSS 99th pctl

7.5

CVSS v3

NVD

Description

ntpd in NTP before 4.2.8p8 allows remote attackers to cause a denial of service (daemon crash) via a crypto-NAK packet. NOTE: this vulnerability exists because of an incorrect fix for CVE-2016-1547.

CWE-476NULL Pointer Dereference

How to fix

Remediation Available

ntpDebian

Fixed in:1:4.2.8p8+dfsg-1CVE-2016-4957

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

44.94%probability of exploitation in 30 days

99thpercentile

Very high risk: more likely to be exploited than 99% of all known CVEs.

References

Patch1

support.ntp.org

Vendor Advisory2

Third-Party Advisory10

Related Vulnerabilities

Other CWE-476 (NULL Pointer Dereference) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2023-21758	High	7.5	92%	-	Fix
CVE-2023-21547	High	7.5	88%	-	Fix
CVE-2014-3470	Medium	4.3	86%	-	Fix
CVE-2021-44224	High	8.2	82%	-	Fix
CVE-2016-0742	High	7.5	82%	-	Fix
CVE-2009-1386	Medium	5.0	80%	-	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.