CVE & CISA-KEV Catalog

CVE-2016-1548

HIGHEPSS 89th pctl
7.2
CVSS v3
NVD

Description

An attacker can spoof a packet from a legitimate ntpd server with an origin timestamp that matches the peer->dst timestamp recorded for that server. After making this switch, the client in NTP 4.2.8p4 and earlier and NTPSec aa48d001683e5b791a743ec9c575aaf7d867a2b0c will reject all future legitimate server responses. It is possible to force the victim client to move time after the mode has been changed. ntpq gives no indication that the mode has been switched.

CWE-19

How to fix

Remediation Available
ntpDebian
Fixed in:1:4.2.8p7+dfsg-1CVE-2016-1548
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

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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
ScopeChanged

Impact

ConfidentialityNone
IntegrityLow
AvailabilityLow

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

Exploit Intelligence

3.84%probability of exploitation in 30 days
89thpercentile

Elevated risk: more likely to be exploited than 89% of all known CVEs.

References

Related Vulnerabilities

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

CVESeverityCVSSEPSSExploitedFix
CVE-2015-5477High7.891%-Fix
CVE-2014-9034Medium5.083%-Fix
CVE-2016-4977High8.879%--
CVE-2016-3236Critical9.878%--
CVE-2014-7141Medium6.476%-Fix
CVE-2015-5374High7.874%--
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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.