CVE-2016-7426
NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a…
Does this matter?
EPSS puts the probability of exploitation in the next 30 days at 12.4%, higher than 96% of all known CVEs. Patch or mitigate before the next change window.
Description
NTP before 4.2.8p9 rate limits responses received from the configured sources when rate limiting for all associations is enabled, which allows remote attackers to cause a denial of service (prevent responses from the sources) by sending responses with a spoofed source address.
- CVSS 3.1
- 7.5 HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 12.37% probability · 96th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-400
- Affected
- ntp/ntp · canonical/ubuntu linux · redhat/enterprise linux desktop · redhat/enterprise linux server · redhat/enterprise linux server aus · redhat/enterprise linux server eus · redhat/enterprise linux server tus · redhat/enterprise linux workstation · hpe/hpux-ntp
- Source
- cve@mitre.org
EPSS 12.4% since 27 October 2026; no change recorded yet. The dashed line is the ten per cent mark our analysts treat as “patch before the next change window”. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://nwtime.org/ntp428p9_release/Third Party Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0252.htmlThird Party Advisory
- http://support.ntp.org/bin/view/Main/NtpBug3071Issue Tracking, Mitigation, Vendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_VulnerabilitiesRelease Notes, Vendor Advisory
- http://www.securityfocus.com/bid/94451Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037354Third Party Advisory, VDB Entry
- https://bto.bluecoat.com/security-advisory/sa139Third Party Advisory
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_usThird Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.ascThird Party Advisory
- https://usn.ubuntu.com/3707-2/Third Party Advisory
- https://www.kb.cert.org/vuls/id/633847Third Party Advisory, US Government Resource
- http://nwtime.org/ntp428p9_release/Third Party Advisory
- http://rhn.redhat.com/errata/RHSA-2017-0252.htmlThird Party Advisory
- http://support.ntp.org/bin/view/Main/NtpBug3071Issue Tracking, Mitigation, Vendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_VulnerabilitiesRelease Notes, Vendor Advisory
- http://www.securityfocus.com/bid/94451Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1037354Third Party Advisory, VDB Entry
- https://bto.bluecoat.com/security-advisory/sa139Third Party Advisory
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_usThird Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-16:39.ntp.ascThird Party Advisory
- https://usn.ubuntu.com/3707-2/Third Party Advisory
- 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.