CVE-2018-7170
ntpd in ntp 4.2.x before 4.2.8p7 and 4.3.x before 4.3.92 allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of ntpd and modify a victim's clock via a Sybil…
Does this matter?
Lower severity and a low EPSS score (2.69%). Track it; it rarely justifies an emergency change on its own.
Description
ntpd in ntp 4.2.x before 4.2.8p7 and 4.3.x before 4.3.92 allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of ntpd and modify a victim's clock via a Sybil attack. This issue exists because of an incomplete fix for CVE-2016-1549.
- CVSS 3.1
- 5.3 MEDIUMCVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
- EPSS
- 2.69% probability · 86th percentile
- Public exploits
- None in Exploit-DB
- CISA KEV
- Not listed
- Affected
- ntp/ntp · synology/router manager · synology/skynas · synology/virtual diskstation manager · synology/diskstation manager · synology/vs960hd firmware · netapp/hci · netapp/solidfire · hpe/hpux-ntp
- Source
- cve@mitre.org
EPSS 2.7% since 27 October 2026; no change recorded yet. Points are recorded when the score first appears and whenever it moves by a percentage point or more.
References
- http://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.htmlThird Party Advisory, VDB Entry
- http://support.ntp.org/bin/view/Main/NtpBug3415Third Party Advisory
- http://www.securityfocus.com/archive/1/541824/100/0/threadedThird Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/103194Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1550214Issue Tracking, Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-18:02.ntp.ascThird Party Advisory
- https://security.gentoo.org/glsa/201805-12Third Party Advisory
- https://security.netapp.com/advisory/ntap-20180626-0001/Third Party Advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_usThird Party Advisory
- https://www.synology.com/support/security/Synology_SA_18_13Third Party Advisory
- http://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.htmlThird Party Advisory, VDB Entry
- http://support.ntp.org/bin/view/Main/NtpBug3415Third Party Advisory
- http://www.securityfocus.com/archive/1/541824/100/0/threadedThird Party Advisory, VDB Entry
- http://www.securityfocus.com/bid/103194Third Party Advisory, VDB Entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1550214Issue Tracking, Third Party Advisory
- https://security.FreeBSD.org/advisories/FreeBSD-SA-18:02.ntp.ascThird Party Advisory
- https://security.gentoo.org/glsa/201805-12Third Party Advisory
- https://security.netapp.com/advisory/ntap-20180626-0001/Third Party Advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_usThird Party Advisory
- https://www.synology.com/support/security/Synology_SA_18_13Third Party Advisory
Source: NVD record, EPSS from FIRST.org, KEV from CISA, exploits from Exploit-DB. Refreshed daily. Download this record as JSON.