Predictive Vulnerability Intelligence.

Product

  • Product
  • Pricing
  • Documentation

Company

  • About
  • Partnerships
  • Blog
  • Support

Legal

  • Terms
  • Privacy
  • Data Licensing

© 2026 FAUCET Technologies LLC. All rights reserved.

CVE-2016-1551

13
FAUCET Score

CVE-2016-1551 describes a vulnerability in ntpd (NTP 4.2.8p3) and NTPsec (a5fb34b9cc89b92a8fef2f459004865c93bb7f92) where the NTP daemon fails to adequately protect against spoofed reference clock requests, treating them as trusted peers. This allows an attacker to manipulate a system's time if the underlying operating system lacks proper martian packet filtering. The vulnerability has a low CVSS score of 3.7, indicating a network attack vector with high attack complexity and a low impact on integrity. There is no evidence of active exploitation, public exploit code (Metasploit, Nuclei, ExploitDB), or significant community discussion, with only one mention and one media article identified.

Impacted Technologies

VendorProductVersion(s)CPE
4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:4.2.8:p3:*:*:*:*:*:*
a5fb34b9cc89b92a8fef2f459004865c93bb7f92CPE matchmatch criteria
cpe:2.3:a:ntpsec:ntpsec:a5fb34b9cc89b92a8fef2f459004865c93bb7f92:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

3.7LOW

CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector
NETWORK
Attack Complexity
HIGH
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.2
Impact Score
1.4
CvssVersion
3.0

Exploit Intelligence

EPSS Score
2.23%
Probability of exploitation in next 30 days
EPSS Percentile
80.9%
Percentile rank of EPSS score among Peer Group
As of 2026-07-24
Model: v2026.06.15
This CVE's current EPSS score of 0.0223 is in the 77th percentile among its peer group of 1,505 CVEs.

Social Chatter

No social media mentions found for this CVE.

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.3 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.0 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2016-1551Low

ntp: ntpd reference clock impersonation

Apr 26, 2016

References

security.freebsd.org / advisories/FreeBSD-SA-16:16.ntp.asc
security.gentoo.org / glsa/201607-15
security.netapp.com / advisory/ntap-20171004-0002
oracle.com / technetwork/topics/security/bulletinapr2016-2952098.html
Third Party Advisory
securityfocus.com / bid/88219
Third Party AdvisoryVDB Entry
securitytracker.com / id/1035705
talosintelligence.com / reports/TALOS-2016-0132
Third Party Advisory