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CVE-2016-9312

35
FAUCET Score

CVE-2016-9312 describes a denial-of-service vulnerability in ntpd versions prior to 4.2.8p9 when running on Microsoft Windows, allowing remote attackers to disrupt service by sending a large UDP packet. This vulnerability carries a high CVSS score of 7.5, indicating a network-based attack with low complexity and a high impact on availability, requiring no user interaction or privileges. While no active exploitation or public exploit code (Metasploit, Nuclei, ExploitDB) has been identified, the vulnerability has garnered some community and media attention, with one article from SecurityWeek covering the patched DoS flaws.

Impacted Technologies

VendorProductVersion(s)CPE
<= 4.2.8CPE matchmatch criteria
cpe:2.3:a:ntp:ntp:*:p8:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.0

7.5HIGH

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
Exploitability Score
3.9
Impact Score
3.6
CvssVersion
3.0

Exploit Intelligence

EPSS Score
31.19%
Probability of exploitation in next 30 days
EPSS Percentile
98.1%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.3119 is in the 97th percentile among its peer group of 51,506 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.4 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Advisories (1)

redhatCVE-2016-9312Important

ntp: DoS by oversized UDP packet

Nov 21, 2016

References

nwtime.org / ntp428p9_release
Release NotesVendor Advisory
bto.bluecoat.com / security-advisory/sa139
support.ntp.org / bin/view/Main/NtpBug3110
Issue TrackingMitigationVendor Advisory
support.ntp.org / bin/view/Main/SecurityNotice
Vendor Advisory
kb.cert.org / vuls/id/633847
Third Party AdvisoryUS Government Resource
securityfocus.com / bid/94450
Third Party AdvisoryVDB Entry
securitytracker.com / id/1037354