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
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
- 5.06% probability of exploitation activity in the next 30 days.
- EPSS percentile
- Equal to or higher than the score of 92.0% 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
06 References
- www.securityfocus.com88276http://www.securityfocus.com/bid/88276
- www.debian.orgDSA-3629http://www.debian.org/security/2016/dsa-3629
- www.oracle.comhttp://www.oracle.com/technetwork/topics/security/linuxbulletinapr2016-2952096.html
- access.redhat.comRHSA-2016:1141https://access.redhat.com/errata/RHSA-2016:1141
- rhn.redhat.comRHSA-2016:1552http://rhn.redhat.com/errata/RHSA-2016-1552.html
- www.securitytracker.com1035705http://www.securitytracker.com/id/1035705
- www.oracle.comhttp://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- security.netapp.comhttps://security.netapp.com/advisory/ntap-20171004-0002/
- www.talosintelligence.comhttp://www.talosintelligence.com/reports/TALOS-2016-0081/
- security.freebsd.orgFreeBSD-SA-16:16https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
- security.gentoo.orgGLSA-201607-15https://security.gentoo.org/glsa/201607-15
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-497656.pdf
- us-cert.cisa.govhttps://us-cert.cisa.gov/ics/advisories/icsa-21-103-11
- cert-portal.siemens.comhttps://cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf
- www.arista.comhttps://www.arista.com/en/support/advisories-notices/security-advisories/1332-security-advisory-19
07 Fixed in
Debian 11
- ntp Fixed in 1:4.2.8p7+dfsg-1
Source: Debian Security Tracker, the Debian security team. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 14.04 LTS
- ntp Fixed in 1:4.2.6.p5+dfsg-3ubuntu2.14.04.10
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
Ubuntu 16.04 LTS
- ntp Fixed in 1:4.2.8p4+dfsg-3ubuntu5.3
Source: Ubuntu, Canonical Ltd. Licensed under CC BY-SA 4.0. Received through OSV.dev. Reformatted by exploit.cc.
A release or ecosystem missing from this list has no record here. It may be unaffected or not covered by the source. Source notices and licences.