01 Record

CVE-2016-1547

An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a

UnratedPUBLISHEDCNA: certcc

CNA base scoreUnratedNo CNA CVSS vector

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02 Description

An off-path attacker can cause a preemptible client association to be demobilized in NTP 4.2.8p4 and earlier and NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92 by sending a crypto NAK packet to a

03 Exploitation and scoring

Exploitation: Not assessed. CISA has not published an exploitation assessment for this record, and it is not in the KEV catalog. That is an absence of assessment, not a finding of no risk.
SSVC decision: Not assessed by CISA
EPSS probability: 5.11% probability of exploitation activity in the next 30 days.
EPSS percentile: Ranks above 91.8% of scored records. A rank, not a probability.
NVD base score: 5.3 (CVSS v3.x), scored by the NVD independently of the CNA.
NVD CVSS vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
NVD analysis status: Modified. NVD last modified this record on 2026-06-17.
Red Hat severity: Moderate. Red Hat's rating for its own products, not a CVSS rating.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published

2017-01-06 21:00Z9 YR AGO

Last updated

2024-08-05 23:02Z2 YR AGO

Reserved

2016-01-07

Assigning CNA

certcc

Record state

PUBLISHED

Severity

Not rated by the issuing CNA

CNA CVSS vector

Not published by the issuing CNA

Weaknesses

CWE-20Improper Input ValidationClass

Data version

5.1

Document digest

2db32a368aec0b1a384b7c5f01ce63f1ef6aafdc8b01fb99c9ae2930ee27d928

05 Affected products

VendorProductVersionsPlatforms

NTP ProjectNTP4.2.8p3, 4.2.8p4—

NTPsec ProjectNTPSeca5fb34b9cc89b92a8fef2f459004865c93bb7f92—

06 References

www.securityfocus.com88276http://www.securityfocus.com/bid/88276vdb-entryx_refsource_BID
www.debian.orgDSA-3629http://www.debian.org/security/2016/dsa-3629vendor-advisoryx_refsource_DEBIAN
www.oracle.comhttp://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.htmlx_refsource_CONFIRM
access.redhat.comRHSA-2016:1141https://access.redhat.com/errata/RHSA-2016:1141vendor-advisoryx_refsource_REDHAT
rhn.redhat.comRHSA-2016:1552http://rhn.redhat.com/errata/RHSA-2016-1552.htmlvendor-advisoryx_refsource_REDHAT
www.securitytracker.com1035705http://www.securitytracker.com/id/1035705vdb-entryx_refsource_SECTRACK
www.oracle.comhttp://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.htmlx_refsource_CONFIRM
security.netapp.comhttps://security.netapp.com/advisory/ntap-20171004-0002/x_refsource_CONFIRM
www.talosintelligence.comhttp://www.talosintelligence.com/reports/TALOS-2016-0081/x_refsource_MISC
security.freebsd.orgFreeBSD-SA-16:16https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.ascvendor-advisoryx_refsource_FREEBSD
security.gentoo.orgGLSA-201607-15https://security.gentoo.org/glsa/201607-15vendor-advisoryx_refsource_GENTOO
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdfx_refsource_CONFIRM
us-cert.cisa.govhttps://us-cert.cisa.gov/ics/advisories/icsa-21-103-11x_refsource_CONFIRM
cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdfx_refsource_CONFIRM
www.arista.comhttps://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19x_refsource_MISC

01 Record index

CVE-2016-1547

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References

02 Records

CVE-2016-1547

02 Description

03 Exploitation and scoring

04 Metadata

05 Affected products

06 References