VulnerabilityModified

CVE-2016-9312

ntpd in NTP before 4.2.8p9, when running on Windows, allows remote attackers to cause a denial of service via a large UDP packet.

HIGH 7.5EPSS 31.7%

Does this matter?

EPSS puts the probability of exploitation in the next 30 days at 31.7%, higher than 98% of all known CVEs. Patch or mitigate before the next change window.

Description

ntpd in NTP before 4.2.8p9, when running on Windows, allows remote attackers to cause a denial of service via a large UDP packet.

CVSS 3.0: 7.5 HIGHCVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS: 31.71% probability · 98th percentile
Public exploits: None in Exploit-DB
CISA KEV: Not listed
Weakness: CWE-399
Affected: ntp/ntp
Source: cve@mitre.org

EPSS trend

EPSS moved from 9.2% on 21 September 2026 to 31.7% on 27 October 2026. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”.

References

http://nwtime.org/ntp428p9_release/Release Notes, Vendor Advisory
http://support.ntp.org/bin/view/Main/NtpBug3110Issue Tracking, Mitigation, Vendor Advisory
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_VulnerabilitiesVendor Advisory
http://www.securityfocus.com/bid/94450Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037354
https://bto.bluecoat.com/security-advisory/sa139
https://www.kb.cert.org/vuls/id/633847Third Party Advisory, US Government Resource
http://nwtime.org/ntp428p9_release/Release Notes, Vendor Advisory
http://support.ntp.org/bin/view/Main/NtpBug3110Issue Tracking, Mitigation, Vendor Advisory
http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_VulnerabilitiesVendor Advisory
http://www.securityfocus.com/bid/94450Third Party Advisory, VDB Entry
http://www.securitytracker.com/id/1037354
https://bto.bluecoat.com/security-advisory/sa139
https://www.kb.cert.org/vuls/id/633847Third Party Advisory, US Government Resource

Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.