CVE-2017-6463
NTP before 4.2.8p10 and 4.3.x before 4.3.94 allows remote authenticated users to cause a denial of service (daemon crash) via an invalid setting in a :config directive, related to the unpeer option.
Does this matter?
Lower severity and a low EPSS score (5.24%). Track it; it rarely justifies an emergency change on its own.
Description
NTP before 4.2.8p10 and 4.3.x before 4.3.94 allows remote authenticated users to cause a denial of service (daemon crash) via an invalid setting in a :config directive, related to the unpeer option.
- CVSS 3.0
- 6.5 MEDIUMCVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- EPSS
- 5.24% probability · 92th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Weakness
- CWE-20
- Affected
- ntp/ntp
- Source
- cve@mitre.org
EPSS 5.2% 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://support.ntp.org/bin/view/Main/NtpBug3387Vendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#March_2017_ntp_4_2_8p10_NTP_SecuVendor Advisory
- http://www.securityfocus.com/bid/97049Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038123Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:3071
- https://access.redhat.com/errata/RHSA-2018:0855
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:03.ntp.asc
- https://support.apple.com/HT208144
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us
- https://usn.ubuntu.com/3707-2/
- http://support.ntp.org/bin/view/Main/NtpBug3387Vendor Advisory
- http://support.ntp.org/bin/view/Main/SecurityNotice#March_2017_ntp_4_2_8p10_NTP_SecuVendor Advisory
- http://www.securityfocus.com/bid/97049Third Party Advisory, VDB Entry
- http://www.securitytracker.com/id/1038123Third Party Advisory, VDB Entry
- https://access.redhat.com/errata/RHSA-2017:3071
- https://access.redhat.com/errata/RHSA-2018:0855
- https://security.FreeBSD.org/advisories/FreeBSD-SA-17:03.ntp.asc
- https://support.apple.com/HT208144
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us
- https://usn.ubuntu.com/3707-2/
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.