CVE-2018-7185

The protocol engine in ntp 4.2.6 before 4.2.8p11 allows a remote attackers to cause a denial of service (disruption) by continually sending a packet with a zero-origin timestamp and source IP address of the "other side" of an interleaved association causing the victim ntpd to reset its association.

Published: 2018-03-06 Last update: 2025-01-14 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2018-7185 is rated Moderate Risk (59.2/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.92%). Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2018-7185

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-10 3.77% 2.92% -0.85%
2 2026-01-02 3.51% 3.77% +0.27%
3 2025-12-28 — 3.51% —

Full EPSS history (30 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2018-7185

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
7.5 3.1 HIGH
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:N)
Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:N)
Doesn’t really leak secrets in a meaningful way.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 3.9 3.6 [email protected]
5.0 2.0 MEDIUM
AV:N/AC:L/Au:N/C:N/I:N/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:L)
Exploitation conditions are straightforward and predictable.
Authentication (AU:N)
No authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:N)
No integrity impact.
Availability impact (A:P)
Partial availability impact.
 10.0 2.9 [email protected]

Weakness enumeration for CVE-2018-7185

OS Trackers for CVE-2018-7185

vendor priority summary link
debian low CVE-2018-7185 low priority: Debian including 2 source packages (ntp, ntpsec), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6. https://security-tracker.debian.org/tracker/CVE-2018-7185
gentoo normal CVE-2018-7185: 1 GLSA(s) (201805-12), 1 atom(s) (net-misc/ntp); latest impact normal. https://bugs.gentoo.org/buglist.cgi?quicksearch=CVE-2018-7185
redhat low — https://access.redhat.com/security/cve/CVE-2018-7185
suse low CVE-2018-7185 severity low: SUSE including 22 source package names (ntp, ntp-4.2.8p11-2.12, …), 86 product×package rows across 61 product lines (Image SLES12-SP5-Azure-BYOS, Image SLES12-SP5-Azure-Basic-On-Demand, … (61 product lines)): Fixed 75, Known Not Affected 11. https://www.suse.com/security/cve/CVE-2018-7185/
ubuntu low CVE-2018-7185 low priority: Ubuntu including 1 source packages (ntp), 6 status rows across 6 suites (artful, bionic, cosmic, trusty, upstream, xenial): released 6. https://ubuntu.com/security/CVE-2018-7185

Affected software / configurations for CVE-2018-7185

Vendor Product Version Raw CPE
ntp ntp >= 4.2.6, < 4.2.8 cpe:2.3:a:ntp:ntp:*:*:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:-:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p1:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p1-beta1:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p1-beta2:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p1-beta3:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p1-beta4:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p1-beta5:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p1-rc1:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p1-rc2:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p10:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p2:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p2-rc1:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p2-rc2:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p2-rc3:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p3:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p3-rc1:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p3-rc2:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p3-rc3:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p4:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p5:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p6:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p7:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p8:*:*:*:*:*:*
ntp ntp 4.2.8 cpe:2.3:a:ntp:ntp:4.2.8:p9:*:*:*:*:*:*
synology router_manager >= 1.1, < 1.1.6-6931-3 cpe:2.3:a:synology:router_manager:*:*:*:*:*:*:*:*
synology skynas < 6.1.5-15254 cpe:2.3:a:synology:skynas:*:*:*:*:*:*:*:*
synology virtual_diskstation_manager < 6.1.6-15266 cpe:2.3:a:synology:virtual_diskstation_manager:*:*:*:*:*:*:*:*
synology diskstation_manager >= 5.2, < 6.1.6-15266 cpe:2.3:o:synology:diskstation_manager:*:*:*:*:*:*:*:*
synology vs960hd_firmware < 2.2.3-1505 cpe:2.3:o:synology:vs960hd_firmware:*:*:*:*:*:*:*:*
canonical ubuntu_linux 12.04 cpe:2.3:o:canonical:ubuntu_linux:12.04:*:*:*:esm:*:*:*
canonical ubuntu_linux 14.04 cpe:2.3:o:canonical:ubuntu_linux:14.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 16.04 cpe:2.3:o:canonical:ubuntu_linux:16.04:*:*:*:lts:*:*:*
canonical ubuntu_linux 17.10 cpe:2.3:o:canonical:ubuntu_linux:17.10:*:*:*:*:*:*:*
canonical ubuntu_linux 18.04 cpe:2.3:o:canonical:ubuntu_linux:18.04:*:*:*:lts:*:*:*
netapp hci — cpe:2.3:a:netapp:hci:-:*:*:*:*:*:*:*
netapp solidfire — cpe:2.3:a:netapp:solidfire:-:*:*:*:*:*:*:*
hpe hpux-ntp < c.4.2.8.4.0 cpe:2.3:a:hpe:hpux-ntp:*:*:*:*:*:*:*:*
oracle fujitsu_m10-1_firmware < xcp2361 cpe:2.3:o:oracle:fujitsu_m10-1_firmware:*:*:*:*:*:*:*:*
oracle fujitsu_m10-4_firmware < xcp2361 cpe:2.3:o:oracle:fujitsu_m10-4_firmware:*:*:*:*:*:*:*:*
oracle fujitsu_m10-4s_firmware < xcp2361 cpe:2.3:o:oracle:fujitsu_m10-4s_firmware:*:*:*:*:*:*:*:*
oracle fujitsu_m12-1_firmware < xcp2361 cpe:2.3:o:oracle:fujitsu_m12-1_firmware:*:*:*:*:*:*:*:*
oracle fujitsu_m12-2_firmware < xcp2361 cpe:2.3:o:oracle:fujitsu_m12-2_firmware:*:*:*:*:*:*:*:*
oracle fujitsu_m12-2s_firmware < xcp2361 cpe:2.3:o:oracle:fujitsu_m12-2s_firmware:*:*:*:*:*:*:*:*
oracle fujitsu_m10-1_firmware < xcp3070 cpe:2.3:o:oracle:fujitsu_m10-1_firmware:*:*:*:*:*:*:*:*
oracle fujitsu_m10-4_firmware < xcp3070 cpe:2.3:o:oracle:fujitsu_m10-4_firmware:*:*:*:*:*:*:*:*
oracle fujitsu_m10-4s_firmware < xcp3070 cpe:2.3:o:oracle:fujitsu_m10-4s_firmware:*:*:*:*:*:*:*:*
oracle fujitsu_m12-1_firmware < xcp3070 cpe:2.3:o:oracle:fujitsu_m12-1_firmware:*:*:*:*:*:*:*:*
oracle fujitsu_m12-2_firmware < xcp3070 cpe:2.3:o:oracle:fujitsu_m12-2_firmware:*:*:*:*:*:*:*:*
oracle fujitsu_m12-2s_firmware < xcp3070 cpe:2.3:o:oracle:fujitsu_m12-2s_firmware:*:*:*:*:*:*:*:*

References for CVE-2018-7185

URL Tags
http://packetstormsecurity.com/files/146631/Slackware-Security-Advisory-ntp-Updates.html Third Party Advisory VDB Entry
http://support.ntp.org/bin/view/Main/NtpBug3454 Mitigation Vendor Advisory
http://www.securityfocus.com/archive/1/541824/100/0/threaded Third Party Advisory VDB Entry
http://www.securityfocus.com/bid/103339 Third Party Advisory VDB Entry
https://security.FreeBSD.org/advisories/FreeBSD-SA-18:02.ntp.asc Third Party Advisory
https://security.gentoo.org/glsa/201805-12 Third 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_us Third Party Advisory
https://usn.ubuntu.com/3707-1/ Third Party Advisory
https://usn.ubuntu.com/3707-2/ Third Party Advisory
https://www.oracle.com/technetwork/security-advisory/cpuoct2019-5072832.html Third Party Advisory
https://www.synology.com/support/security/Synology_SA_18_13 Third Party Advisory
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