CVE-2018-7170
Synology
- Published
- 6 March 2018
- Last modified
- 17 June 2026
- CVSS
- 5.3 v3.1
- Severity
- medium
- EPSS
- 2.7% (85th pct)
- CISA KEV
- Not listed
- NVD status
- Modified
- Weaknesses
- None assigned
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N
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.
Exploitation
Not listed in the CISA Known Exploited Vulnerabilities catalogue as of 2026.09.04. The catalogue records confirmed public exploitation. Absence from it does not establish that exploitation has not occurred. EPSS models a 2.7% probability of exploitation activity in the next 30 days.
Affected products
| Product | Vendor | Type | Versions named |
|---|---|---|---|
| VS960HD | Synology | unknown | < 2.2.3-1505, < 2.3.6-1720 |
References
- http://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.html third-party
- http://support.ntp.org/bin/view/Main/NtpBug3415 third-party
- http://www.securityfocus.com/archive/1/541824/100/0/threaded third-party
- http://www.securityfocus.com/bid/103194 third-party
- https://bugzilla.redhat.com/show_bug.cgi?id=1550214 third-party
- https://security.FreeBSD.org/advisories/FreeBSD-SA-18:02.ntp.asc third-party
- https://security.gentoo.org/glsa/201805-12 third-party
- https://security.netapp.com/advisory/ntap-20180626-0001/ third-party
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us third-party
- https://www.synology.com/support/security/Synology_SA_18_13 third-party
- http://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.html third-party
- http://support.ntp.org/bin/view/Main/NtpBug3415 third-party
- http://www.securityfocus.com/archive/1/541824/100/0/threaded third-party
- http://www.securityfocus.com/bid/103194 third-party
- https://bugzilla.redhat.com/show_bug.cgi?id=1550214 third-party
- https://security.FreeBSD.org/advisories/FreeBSD-SA-18:02.ntp.asc third-party
- https://security.gentoo.org/glsa/201805-12 third-party
- https://security.netapp.com/advisory/ntap-20180626-0001/ third-party
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us third-party
- https://www.synology.com/support/security/Synology_SA_18_13 third-party
Record assembled from NVD, CISA KEV 2026.09.04 and FIRST EPSS 2026-09-04. Affected products are those NVD's CPE configuration names that fall inside this site's scope; a CVE may affect products outside it.