CVE catalog

CVE-2018-7170

ntpsec: CVE-2018-7170

Severity: Low · CVSS 3.1CVSS:3.0/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N
Published: Mar 6, 2018, 8:29:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 2.69% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

Distribution	Package	Release	Version	Status
Debian	ntpsec	sid	`1.2.5+dfsg-1`	not affected
Debian	ntpsec	forky	`1.2.5+dfsg-1`	not affected
Debian	ntpsec	trixie	`1.2.3+dfsg1-8`	not affected
Debian	ntpsec	bookworm	`1.2.2+dfsg1-1+deb12u1`	not affected
Debian	ntpsec	bookworm-security	`1.2.2+dfsg1-1+deb12u1`	not affected
Ubuntu	ntp	pro	`1:4.2.8p10+dfsg-5ubuntu3`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p10+dfsg-5ubuntu4`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p10+dfsg-5ubuntu5`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p10+dfsg-5ubuntu6`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p10+dfsg-5ubuntu7`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p10+dfsg-5ubuntu7.1`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p10+dfsg-5ubuntu7.1+esm1`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p10+dfsg-5ubuntu7.1+esm2`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p10+dfsg-5ubuntu7.2`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p10+dfsg-5ubuntu7.2+esm1`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p10+dfsg-5ubuntu7.3`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p10+dfsg-5ubuntu7.3+esm1`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.6.p5+dfsg-3ubuntu8`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.6.p5+dfsg-3ubuntu8.1`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.6.p5+dfsg-3ubuntu9`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu1`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu2`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu3`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu4`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.1`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.2`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.3`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.4`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.5`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.6`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.7`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.8`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.9`	vulnerable
Ubuntu	ntp	16.04	`1:4.2.8p4+dfsg-3ubuntu5.10`	vulnerable

Fixed-version evidence

Distribution	Package	Type	Release	Fixed version	Urgency	Origin	Bugs
Debian	ntpsec	source	sid	`Not affected`	unimportant	Not reported	Not reported
Debian	ntpsec	source	forky	`Not affected`	unimportant	Not reported	Not reported
Debian	ntpsec	source	trixie	`Not affected`	unimportant	Not reported	Not reported
Debian	ntpsec	source	bookworm	`Not affected`	unimportant	Not reported	Not reported

OpenFactory catalog packages

[Debian 12 (Bookworm)]

[ntp]Not affected
Source package: [ntpsec]
Details (4)
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntpdate]Not affected
Source package: [ntpsec]
Details (4)
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntp-doc]Not affected
Source package: [ntpsec]
Details (4)
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntpsec]Not affected
Details (4)
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntpsec-doc]Not affected
Source package: [ntpsec]
Details (4)
- 1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntpsec-ntpdate]Not affected
Source package: [ntpsec]
Details (4)
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntpsec-ntpdig]Not affected
Source package: [ntpsec]
Details (4)
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[ntpsec-ntpviz]Not affected
Source package: [ntpsec]
Details (4)
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[python3-ntp]Not affected
Source package: [ntpsec]
Details (4)
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1.2.2+dfsg1-1+deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
[sntp]Not affected
Source package: [ntpsec]
Details (4)
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm
- 1:4.2.8p15+dfsg-2~1.2.2+dfsg1-1+deb12u1 · all · bookworm-security
  Not affected
  dsa · ntpsec · debian · bookworm

Observed: Oct 23, 2026, 5:37:37 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [SUSE security advisories and VEX]