CVE-2016-1547

MEDIUM

NTP < 4.2.8p4 / NTPSec < a5fb34b - DoS via Spoofed Crypto NAK

Title source: llm
STIX 2.1

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.

References (15)

Core 15
Core References
Third Party Advisory, VDB Entry vdb-entry x_refsource_bid
http://www.securityfocus.com/bid/88276
Vendor Advisory vendor-advisory x_refsource_redhat
https://access.redhat.com/errata/RHSA-2016:1141
Vendor Advisory vendor-advisory x_refsource_redhat
http://rhn.redhat.com/errata/RHSA-2016-1552.html
Third Party Advisory, VDB Entry vdb-entry x_refsource_sectrack
http://www.securitytracker.com/id/1035705
Mitigation, Technical Description, Third Party Advisory x_refsource_misc
http://www.talosintelligence.com/reports/TALOS-2016-0081/
Various Sources vendor-advisory x_refsource_freebsd
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
Third Party Advisory, US Government Resource x_refsource_confirm
https://us-cert.cisa.gov/ics/advisories/icsa-21-103-11
Vendor Advisory x_refsource_confirm
https://security.netapp.com/advisory/ntap-20171004-0002/
Third Party Advisory vendor-advisory x_refsource_debian
http://www.debian.org/security/2016/dsa-3629
Third Party Advisory vendor-advisory x_refsource_gentoo
https://security.gentoo.org/glsa/201607-15

Scores

CVSS v3 5.3
EPSS 0.0511
EPSS Percentile 91.4%
Attack Vector NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

Details

CWE
CWE-20
Status published
Products (4)
ntp/ntp < 4.2.8
NTP Project/NTP 4.2.8p3
NTP Project/NTP 4.2.8p4
NTPsec Project/NTPSec a5fb34b9cc89b92a8fef2f459004865c93bb7f92
Published Jan 06, 2017
Tracked Since Feb 18, 2026