Is CVE-2016-1550 in the CISA KEV catalog?

No. CVE-2016-1550 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2016-1550?

CVE-2016-1550 has a CVSS v3 base score of 5.3 (MEDIUM).

What is the EPSS score for CVE-2016-1550?

CVE-2016-1550 has an EPSS score of 3.63% (88th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2016-1550?

Upgrade ntp on debian 11 to 1:4.2.8p7+dfsg-1 or later. Fixes are available for 2 affected products.

CVE & CISA-KEV Catalog

CVE-2016-1550

MEDIUMEPSS 88th pctl

5.3

CVSS v3

NVD

Description

An exploitable vulnerability exists in the message authentication functionality of libntp in ntp 4.2.8p4 and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92. An attacker can send a series of crafted messages to attempt to recover the message digest key.

CWE-200Information Exposure

How to fix

Remediation Available

ntpDebian

Fixed in:1:4.2.8p7+dfsg-1CVE-2016-1550

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

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

ConfidentialityLow

IntegrityNone

AvailabilityNone

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

Exploit Intelligence

3.63%probability of exploitation in 30 days

88thpercentile

Elevated risk: more likely to be exploited than 88% of all known CVEs.

References

Related Vulnerabilities

Other CWE-200 (Information Exposure) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2024-24919	High	8.6	100%	KEV + Ransom	-
CVE-2020-14181	Medium	5.3	100%	-	Fix
CVE-2021-34429	Medium	5.3	99%	-	Fix
CVE-2018-11409	Medium	5.3	98%	-	-
CVE-2021-41277	Critical	10.0	97%	KEV	-
CVE-2016-2183	High	7.5	96%	-	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.