1. Home
  2. Vulnerabilities
  3. CVE-2016-1549
6.5
MEDIUM CVSS 3.0
CVE-2016-1549
NTP ntpd Ephemeral Association Clock Manipulation
Description

A malicious authenticated peer can create arbitrarily-many ephemeral associations in order to win the clock selection algorithm in ntpd in NTP 4.2.8p4 and earlier and NTPsec 3e160db8dc248a0bcb053b56a80167dc742d2b74 and a5fb34b9cc89b92a8fef2f459004865c93bb7f92 and modify a victim's clock.

INFO

Published Date :

Jan. 6, 2017, 9:59 p.m.

Last Modified :

April 20, 2025, 1:37 a.m.

Remotely Exploit :

Yes !

Source :

[email protected]
Affected Products

The following products are affected by CVE-2016-1549 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Ntp ntp
1 Ntpsec ntpsec
: Total Affected Vendor : 2 | Products : 2
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 2.0 MEDIUM [email protected]
CVSS 3.0 MEDIUM [email protected]
Solution
Upgrade NTP software to the latest version to address the clock manipulation vulnerability.
  • Update the NTP software to a version 4.2.8p12, 4.3.94, or later.
  • Apply the latest available security patches for NTP.
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2016-1549.

URL Resource
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.securityfocus.com/bid/88200
http://www.securitytracker.com/id/1035705
http://www.talosintelligence.com/reports/TALOS-2016-0083/ Mitigation Technical Description Third Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
https://security.gentoo.org/glsa/201607-15
https://security.netapp.com/advisory/ntap-20171004-0002/
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us
https://www.synology.com/support/security/Synology_SA_18_13
http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
http://www.securityfocus.com/bid/88200
http://www.securitytracker.com/id/1035705
http://www.talosintelligence.com/reports/TALOS-2016-0083/ Mitigation Technical Description Third Party Advisory
https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
https://security.gentoo.org/glsa/201607-15
https://security.netapp.com/advisory/ntap-20171004-0002/
https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us
https://www.synology.com/support/security/Synology_SA_18_13
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2016-1549 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2016-1549 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2016-1549 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2016-1549 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by af854a3a-2127-422b-91ae-364da2661108

    Nov. 21, 2024

    Action Type Old Value New Value
    Added Reference http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
    Added Reference http://www.securityfocus.com/bid/88200
    Added Reference http://www.securitytracker.com/id/1035705
    Added Reference http://www.talosintelligence.com/reports/TALOS-2016-0083/
    Added Reference https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc
    Added Reference https://security.gentoo.org/glsa/201607-15
    Added Reference https://security.netapp.com/advisory/ntap-20171004-0002/
    Added Reference https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us
    Added Reference https://www.synology.com/support/security/Synology_SA_18_13
  • CVE Modified by [email protected]

    May. 14, 2024

    Action Type Old Value New Value
  • CVE Modified by [email protected]

    Oct. 31, 2019

    Action Type Old Value New Value
    Added Reference https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us [No Types Assigned]
  • CVE Modified by [email protected]

    Mar. 28, 2018

    Action Type Old Value New Value
    Added Reference https://www.synology.com/support/security/Synology_SA_18_13 [No Types Assigned]
  • CVE Modified by [email protected]

    Nov. 21, 2017

    Action Type Old Value New Value
    Added Reference https://security.FreeBSD.org/advisories/FreeBSD-SA-16:16.ntp.asc [No Types Assigned]
  • CVE Modified by [email protected]

    Nov. 10, 2017

    Action Type Old Value New Value
    Added Reference https://security.netapp.com/advisory/ntap-20171004-0002/ [No Types Assigned]
  • CVE Modified by [email protected]

    Sep. 03, 2017

    Action Type Old Value New Value
    Added Reference http://www.securitytracker.com/id/1035705 [No Types Assigned]
  • CVE Modified by [email protected]

    Jul. 01, 2017

    Action Type Old Value New Value
    Added Reference https://security.gentoo.org/glsa/201607-15 [No Types Assigned]
  • CVE Modified by [email protected]

    Jan. 11, 2017

    Action Type Old Value New Value
    Added Reference http://www.securityfocus.com/bid/88200 [No Types Assigned]
    Added Reference http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html [No Types Assigned]
  • Initial Analysis by [email protected]

    Jan. 10, 2017

    Action Type Old Value New Value
    Added CVSS V2 (AV:N/AC:L/Au:S/C:N/I:P/A:N)
    Added CVSS V3 AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
    Changed Reference Type http://www.talosintelligence.com/reports/TALOS-2016-0083/ No Types Assigned http://www.talosintelligence.com/reports/TALOS-2016-0083/ Mitigation, Third Party Advisory, Technical Description
    Added CWE CWE-19
    Added CPE Configuration OR *cpe:2.3:a:ntp:ntp:4.2.8:p4:*:*:*:*:*:*
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
Vulnerability Scoring Details
Base CVSS Score: 6.5
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact
Base CVSS Score: 4
Access Vector
Access Complexity
Authentication
Confidentiality Impact
Integrity Impact
Availability Impact
Exploit Prediction

EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days.

1.07 }} 0.17%

score

0.77017

percentile