Is CVE-2016-1549 in the CISA KEV catalog?

No. CVE-2016-1549 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-1549?

CVE-2016-1549 has a CVSS v3 base score of 6.5 (MEDIUM).

What is the EPSS score for CVE-2016-1549?

CVE-2016-1549 has an EPSS score of 3.15% (87th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-1549?

Upgrade ntp on debian 11 to 1:4.2.8p7+dfsg-1 or later.

CVE & CISA-KEV Catalog

CVE-2016-1549

MEDIUMEPSS 87th pctl

6.5

CVSS v3

NVD

Description

A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.

CWE-19

How to fix

Remediation Available

ntpDebian

Fixed in:1:4.2.8p7+dfsg-1CVE-2016-1549

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 RequiredLow

User InteractionNone

ScopeUnchanged

Impact

ConfidentialityNone

IntegrityHigh

AvailabilityNone

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Exploit Intelligence

3.15%probability of exploitation in 30 days

87thpercentile

Elevated risk: more likely to be exploited than 87% of all known CVEs.

References

Mitigation1

talosintelligence.com

Other references8

Related Vulnerabilities

Other CWE-19 vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2015-5477	High	7.8	91%	-	Fix
CVE-2014-9034	Medium	5.0	83%	-	Fix
CVE-2016-4977	High	8.8	79%	-	-
CVE-2016-3236	Critical	9.8	78%	-	-
CVE-2014-7141	Medium	6.4	76%	-	Fix
CVE-2015-5374	High	7.8	74%	-	-

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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.