CVE-2016-1549
MEDIUMEPSS 87th pctlDescription
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.
How to fix
TridentStack Control can deploy fixes like this automatically across your Windows, macOS, and Linux fleet. See how it works
Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.
CVSS v3 Vector
Exploitability
Impact
CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N
Exploit Intelligence
Elevated risk: more likely to be exploited than 87% of all known CVEs.
References
Related Vulnerabilities
Other CWE-19 vulnerabilities, ordered by exploit likelihood. View all
| CVE | Severity | CVSS | EPSS | Exploited | Fix |
|---|---|---|---|---|---|
| CVE-2015-5477 | High | 7.8 | 91% | - | Fix |
| CVE-2014-9034 | Medium | 5.0 | 83% | - | Fix |
| CVE-2014-7141 | Medium | 6.4 | 76% | - | Fix |
| CVE-2016-3236 | Critical | 9.8 | 75% | - | - |
| CVE-2015-5374 | High | 7.8 | 74% | - | - |
| CVE-2016-4977 | High | 8.8 | 72% | - | - |
Common questions
How do I fix CVE-2016-1549?
Upgrade ntp on debian 11 to 1:4.2.8p7+dfsg-1 or later.
Is CVE-2016-1549 being actively exploited?
Not that we know of. CVE-2016-1549 is not in the CISA Known Exploited Vulnerabilities catalog. Its EPSS score of 3.2% is the estimated probability that it will be exploited in the next 30 days. That is higher than 87% of all scored CVEs.
How severe is CVE-2016-1549?
CVE-2016-1549 has a CVSS v3 base score of 6.5, rated medium. CVSS rates the technical impact if the vulnerability is exploited, not how likely that is, so weigh it alongside the exploit-prediction score when you decide what to patch first.
What does CVE-2016-1549 affect?
Published advisories record a fix for ntp (Debian). Only products with a sourced advisory are listed, so treat this as what we can cite rather than a complete inventory.
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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-06.