CVE-2016-4955

MITRE NVD CVE.ORG JSON API Print: PDF PDF

Summary

CVECVE-2016-4955
StatePUBLISHED
Assignermitre
Source PriorityCVE Program / NVD first with legacy fallback
Published2016-07-05 01:59:02 UTC
Updated2026-05-06 22:30:45 UTC
Descriptionntpd in NTP 4.x before 4.2.8p8, when autokey is enabled, allows remote attackers to cause a denial of service (peer-variable clearing and association outage) by sending (1) a spoofed crypto-NAK packet or (2) a packet with an incorrect MAC value at a certain time.

Risk And Classification

Primary CVSS: v3.1 5.9 MEDIUM from [email protected]

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Problem Types: CWE-362 | n/a

VersionSourceTypeScoreSeverityVector
3.1[email protected]Primary5.9MEDIUMCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H
2.0[email protected]Primary4.3AV:N/AC:M/Au:N/C:N/I:N/A:P

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
High
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS v2.0 Breakdown

Access Vector
Network
Access Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
None
Availability
Partial

AV:N/AC:M/Au:N/C:N/I:N/A:P

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Ntp Ntp All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Na N/a affected n/a Not specified

References

ReferenceSourceLinkTags
[security-announce] SUSE-SU-2016:1563-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org Mailing List, Third Party Advisory
[SECURITY] Fedora 24 Update: ntp-4.2.6p5-41.fc24 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
SecurityFocus af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
[security-announce] SUSE-SU-2016:1912-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
[security-announce] SUSE-SU-2016:1568-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
security.FreeBSD.org/advisories/FreeBSD-SA-16:24.ntp.asc af854a3a-2127-422b-91ae-364da2661108 security.FreeBSD.org Third Party Advisory
Vulnerability Note VU#321640 - NTP.org ntpd is vulnerable to denial of service and other vulnerabilities af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org
Slackware Security Advisory - ntp Updates ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com
Bug 3043 – Autokey association reset af854a3a-2127-422b-91ae-364da2661108 bugs.ntp.org Issue Tracking, Vendor Advisory
Multiple Vulnerabilities in Network Time Protocol Daemon Affecting Cisco Products: June 2016 af854a3a-2127-422b-91ae-364da2661108 tools.cisco.com
[security-announce] SUSE-SU-2016:1584-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org Mailing List, Third Party Advisory
[security-announce] SUSE-SU-2016:1602-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org Mailing List, Third Party Advisory
SecurityFocus af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
NTP CVE-2016-4955 Denial of Service Vulnerability af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com Third Party Advisory, VDB Entry
cert-portal.siemens.com/productcert/pdf/ssa-211752.pdf af854a3a-2127-422b-91ae-364da2661108 cert-portal.siemens.com Third Party Advisory
NTP: Multiple vulnerabilities (GLSA 201607-15) — Gentoo Security af854a3a-2127-422b-91ae-364da2661108 security.gentoo.org Third Party Advisory
FreeBSD Security Advisory - FreeBSD-SA-16:24.ntp ≈ Packet Storm af854a3a-2127-422b-91ae-364da2661108 packetstormsecurity.com
support.ntp.org/bin/view/Main/NtpBug3043 af854a3a-2127-422b-91ae-364da2661108 support.ntp.org Patch, Vendor Advisory
SecurityFocus af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
Vulnerability Note VU#321640 - NTP.org ntpd is vulnerable to denial of service and other vulnerabilities af854a3a-2127-422b-91ae-364da2661108 www.kb.cert.org Third Party Advisory, US Government Resource
support.ntp.org/bin/view/Main/SecurityNotice af854a3a-2127-422b-91ae-364da2661108 support.ntp.org Release Notes, Vendor Advisory
[security-announce] SUSE-SU-2016:2094-1: important: Security update for af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org
ntp Multiple Bugs Let Remote Users Modify Parameters and Deny Service - SecurityTracker af854a3a-2127-422b-91ae-364da2661108 www.securitytracker.com Third Party Advisory, VDB Entry
[SECURITY] Fedora 22 Update: ntp-4.2.6p5-41.fc22 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
[security-announce] openSUSE-SU-2016:1636-1: important: Security update af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org Mailing List, Third Party Advisory
USN-3096-1: NTP vulnerabilities | Ubuntu af854a3a-2127-422b-91ae-364da2661108 www.ubuntu.com
[SECURITY] Fedora 23 Update: ntp-4.2.6p5-41.fc23 - package-announce - Fedora Mailing-Lists af854a3a-2127-422b-91ae-364da2661108 lists.fedoraproject.org
SecurityFocus af854a3a-2127-422b-91ae-364da2661108 www.securityfocus.com
[security-announce] openSUSE-SU-2016:1583-1: important: Security update af854a3a-2127-422b-91ae-364da2661108 lists.opensuse.org Mailing List, Third Party Advisory
Siemens SIMATIC NET CP 443-1 OPC UA | CISA af854a3a-2127-422b-91ae-364da2661108 us-cert.cisa.gov
Oracle Solaris Bulletin - April 2016 af854a3a-2127-422b-91ae-364da2661108 www.oracle.com Third Party Advisory
[SECURITY] Fedora 24 Update: ntp-4.2.6p5-41.fc24 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 23 Update: ntp-4.2.6p5-41.fc23 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
[SECURITY] Fedora 22 Update: ntp-4.2.6p5-41.fc22 - package-announce - Fedora Mailing-Lists MITRE lists.fedoraproject.org
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Legacy QID Mappings

  • 590736 Siemens SIMATIC NET CP 443-1 OPC UA Multiple Vulnerabilities (ICSA-21-159-11)
  • 690292 Free Berkeley Software Distribution (FreeBSD) Security Update for FreeBSD (7cfcea05-600a-11e6-a6c3-14dae9d210b8)
© CVE.report 2026 |

Use of this information constitutes acceptance for use in an AS IS condition. There are NO warranties, implied or otherwise, with regard to this information or its use. Any use of this information is at the user's risk. It is the responsibility of user to evaluate the accuracy, completeness or usefulness of any information, opinion, advice or other content. EACH USER WILL BE SOLELY RESPONSIBLE FOR ANY consequences of his or her direct or indirect use of this web site. ALL WARRANTIES OF ANY KIND ARE EXPRESSLY DISCLAIMED. This site will NOT BE LIABLE FOR ANY DIRECT, INDIRECT or any other kind of loss.

CVE, CWE, and OVAL are registred trademarks of The MITRE Corporation and the authoritative source of CVE content is MITRE's CVE web site. This site includes MITRE data granted under the following license.

Free CVE JSON API cve.report/api

CVE.report and Source URL Uptime Status status.cve.report