CVE-2018-7184
Synology
- Published
- 6 March 2018
- Last modified
- 17 June 2026
- CVSS
- 7.5 v3.0
- Severity
- high
- EPSS
- 8.5% (95th pct)
- CISA KEV
- Not listed
- NVD status
- Modified
- Weaknesses
- None assigned
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Description
ntpd in ntp 4.2.8p4 before 4.2.8p11 drops bad packets before updating the "received" timestamp, which allows remote attackers to cause a denial of service (disruption) by sending a packet with a zero-origin timestamp causing the association to reset and setting the contents of the packet as the most recent timestamp. This issue is a result of an incomplete fix for CVE-2015-7704.
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 8.5% probability of exploitation activity in the next 30 days, placing it in the top decile of all scored CVEs.
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/NtpBug3453 third-party
- http://www.securityfocus.com/archive/1/541824/100/0/threaded third-party
- http://www.securityfocus.com/bid/103192 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
- https://usn.ubuntu.com/3707-1/ 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/NtpBug3453 third-party
- http://www.securityfocus.com/archive/1/541824/100/0/threaded third-party
- http://www.securityfocus.com/bid/103192 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
- https://usn.ubuntu.com/3707-1/ 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.