CVE-2016-1547
Summary
| CVE | CVE-2016-1547 |
|---|---|
| State | PUBLISHED |
| Assigner | certcc |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2017-01-06 21:59:00 UTC |
| Updated | 2026-05-06 22:30:45 UTC |
| 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 victim client with a spoofed source address of an existing associated peer. This is true even if authentication is enabled. |
Risk And Classification
Primary CVSS: v3.0 5.3 MEDIUM from [email protected]
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
EPSS: 0.036640000 probability, percentile 0.879690000 (date 2026-05-11)
Problem Types: CWE-20 | unspecified
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.0 | [email protected] | Primary | 5.3 | MEDIUM | CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L |
| 2.0 | [email protected] | Primary | 5 | AV:N/AC:L/Au:N/C:N/I:N/A:P |
CVSS v3.0 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
NoneUser Interaction
NoneScope
UnchangedConfidentiality
NoneIntegrity
NoneAvailability
LowCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
CVSS v2.0 Breakdown
Access Vector
NetworkAccess Complexity
LowAuthentication
NoneConfidentiality
NoneIntegrity
NoneAvailability
PartialAV:N/AC:L/Au:N/C:N/I:N/A:P
NVD Known Affected Configurations (CPE 2.3)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | NTP Project | NTP | affected 4.2.8p3 | Not specified |
| CNA | NTP Project | NTP | affected 4.2.8p4 | Not specified |
| CNA | NTPsec Project | NTPSec | affected a5fb34b9cc89b92a8fef2f459004865c93bb7f92 | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| Siemens TIM 4R-IE Devices | CISA | af854a3a-2127-422b-91ae-364da2661108 | us-cert.cisa.gov | |
| April 2016 Network Time Protocol Daemon (ntpd) Vulnerabilities in Multiple NetApp Products | NetApp Product Security | af854a3a-2127-422b-91ae-364da2661108 | security.netapp.com | |
| cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf | af854a3a-2127-422b-91ae-364da2661108 | cert-portal.siemens.com | |
| security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc | af854a3a-2127-422b-91ae-364da2661108 | security.FreeBSD.org | |
| Security Advisory 0019 - Arista | af854a3a-2127-422b-91ae-364da2661108 | www.arista.com | |
| Red Hat Customer Portal | af854a3a-2127-422b-91ae-364da2661108 | access.redhat.com | |
| Red Hat Customer Portal | af854a3a-2127-422b-91ae-364da2661108 | rhn.redhat.com | |
| cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf | af854a3a-2127-422b-91ae-364da2661108 | cert-portal.siemens.com | |
| NTP: Multiple vulnerabilities (GLSA 201607-15) — Gentoo Security | af854a3a-2127-422b-91ae-364da2661108 | security.gentoo.org | |
| ntp Multiple Bugs Let Remote Users Spoof Messages, Obtain Potentially Sensitive Information, Modify Time, and Deny Service - SecurityTracker | af854a3a-2127-422b-91ae-364da2661108 | www.securitytracker.com | |
| Cisco Talos - Talos 2016 0081 | af854a3a-2127-422b-91ae-364da2661108 | www.talosintelligence.com | Mitigation, Technical Description, Third Party Advisory |
| NTP CVE-2016-1547 Denial of Service Vulnerability | af854a3a-2127-422b-91ae-364da2661108 | www.securityfocus.com | |
| Debian -- Security Information -- DSA-3629-1 ntp | af854a3a-2127-422b-91ae-364da2661108 | www.debian.org | |
| Oracle Linux Bulletin - April 2016 | af854a3a-2127-422b-91ae-364da2661108 | www.oracle.com | |
| Oracle Solaris Bulletin - April 2016 | af854a3a-2127-422b-91ae-364da2661108 | www.oracle.com | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.