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…
- 5.3MediumCVSS base score
- 2.7%Exploitation in 30 daysEPSS · top 14% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By mitre
- 19 days later
· 19 days later
Published
- 6 years later
· 6 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.3 | CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N |
- EPSS (exploitation in 30 days)
- 2.7% · top 14% of all CVEs (9 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.3.
Affected products
n/a
- affected n/a
References
10
- http://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.html (opens in a new tab)x_refsource_MISCx_transferred
- GLSA-201805-12 (opens in a new tab)vendor-advisoryx_refsource_GENTOOx_transferred
- FreeBSD-SA-18:02 (opens in a new tab)vendor-advisoryx_refsource_FREEBSDx_transferred
- https://security.netapp.com/advisory/ntap-20180626-0001/ (opens in a new tab)x_refsource_CONFIRMx_transferred
- 20180301 [Newsletter/Marketing] [slackware-security] ntp (SSA:2018-060-02) (opens in a new tab)mailing-listx_refsource_BUGTRAQx_transferred
- https://bugzilla.redhat.com/show_bug.cgi?id=1550214 (opens in a new tab)x_refsource_MISCx_transferred
- http://support.ntp.org/bin/view/Main/NtpBug3415 (opens in a new tab)x_refsource_CONFIRMx_transferred
- https://www.synology.com/support/security/Synology_SA_18_13 (opens in a new tab)x_refsource_CONFIRMx_transferred
- 103194 (opens in a new tab)vdb-entryx_refsource_BIDx_transferred
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us (opens in a new tab)x_refsource_CONFIRMx_transferred
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2018-18912 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2018-7170)Record last updated .