CVE catalog

CVE-2018-8956

ntpsec: CVE-2018-8956

Severity: Low · CVSS 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L
Published: May 6, 2020, 7:15:00 PM UTC
Source: [NVD] · [CVE record]
EPSS: 3.14% · Oct 25, 2026

ntpd in ntp 4.2.8p10, 4.2.8p11, 4.2.8p12 and 4.2.8p13 allow remote attackers to prevent a broadcast client from synchronizing its clock with a broadcast NTP server via soofed mode 3 and mode 5 packets. The attacker must either be a part of the same broadcast network or control a slave in that broadcast network that can capture certain required packets on the attacker's behalf and send them to the attacker.

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
Opensuse	ntp	leap 15.1	`4.2.8p15-lp151.2.3.1`	fixed
Suse	ntp	hpe helion openstack 8	`4.2.8p15-88.1`	fixed
Suse	ntp	openstack cloud 7	`4.2.8p15-88.1`	fixed
Suse	ntp	openstack cloud 8	`4.2.8p15-88.1`	fixed
Suse	ntp	openstack cloud crowbar 8	`4.2.8p15-88.1`	fixed
Suse	ntp	linux enterprise server for sap applications 12 sp2	`4.2.8p15-88.1`	fixed
Suse	ntp	linux enterprise server for sap applications 12 sp3	`4.2.8p15-88.1`	fixed
Suse	ntp	linux enterprise server 12 sp2-ltss	`4.2.8p15-88.1`	fixed
Suse	ntp	linux enterprise server 12 sp2-bcl	`4.2.8p15-88.1`	fixed
Suse	ntp	linux enterprise server 12 sp3-ltss	`4.2.8p15-88.1`	fixed
Suse	ntp	linux enterprise server 12 sp3-bcl	`4.2.8p15-88.1`	fixed
Suse	ntp	linux enterprise server 12 sp4	`4.2.8p15-88.1`	fixed
Suse	ntp	linux enterprise server for sap applications 12 sp4	`4.2.8p15-88.1`	fixed
Suse	ntp	linux enterprise server 12 sp5	`4.2.8p15-88.1`	fixed
Suse	ntp	linux enterprise server for sap applications 12 sp5	`4.2.8p15-88.1`	fixed
Suse	ntp	enterprise storage 5	`4.2.8p15-88.1`	fixed
Suse	ntp	linux enterprise module for legacy 15 sp1	`4.2.8p15-4.10.1`	fixed
Suse	ntp	linux enterprise module for legacy 15 sp2	`4.2.8p15-4.10.1`	fixed
Suse	ntp	linux enterprise server 15-ltss	`4.2.8p15-4.10.1`	fixed
Suse	ntp	linux enterprise server for sap applications 15	`4.2.8p15-4.10.1`	fixed
Opensuse	ntp	leap 15.2	`4.2.8p15-lp152.3.3.1`	fixed
Suse	ntp	linux enterprise server 11 sp4-ltss	`4.2.8p15-64.16.1`	fixed
Ubuntu	ntp	pro	`1:4.2.8p12+dfsg-3ubuntu2`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p12+dfsg-3ubuntu3`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p12+dfsg-3ubuntu4`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p12+dfsg-3ubuntu4.20.04.1`	vulnerable
Ubuntu	ntp	pro	`1:4.2.8p12+dfsg-3ubuntu4.20.04.1+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
Ubuntu	ntp	22.04	`1:4.2.8p12+dfsg-3ubuntu6`	vulnerable
Ubuntu	ntp	22.04	`1:4.2.8p15+dfsg-1ubuntu1`	vulnerable
Ubuntu	ntp	22.04	`1:4.2.8p15+dfsg-1ubuntu2`	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
Opensuse	ntp	rpm	leap 15.1	`4.2.8p15-lp151.2.3.1`	Not reported	OPENSUSE-SU-2020:0934-1	Not reported
Suse	ntp	rpm	hpe helion openstack 8	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	openstack cloud 7	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	openstack cloud 8	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	openstack cloud crowbar 8	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	linux enterprise server for sap applications 12 sp2	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	linux enterprise server for sap applications 12 sp3	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	linux enterprise server 12 sp2-ltss	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	linux enterprise server 12 sp2-bcl	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	linux enterprise server 12 sp3-ltss	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	linux enterprise server 12 sp3-bcl	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	linux enterprise server 12 sp4	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	linux enterprise server for sap applications 12 sp4	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	linux enterprise server 12 sp5	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	linux enterprise server for sap applications 12 sp5	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	enterprise storage 5	`4.2.8p15-88.1`	Not reported	SUSE-SU-2020:1805-1	Not reported
Suse	ntp	rpm	linux enterprise module for legacy 15 sp1	`4.2.8p15-4.10.1`	Not reported	SUSE-SU-2020:1823-1	Not reported
Suse	ntp	rpm	linux enterprise module for legacy 15 sp2	`4.2.8p15-4.10.1`	Not reported	SUSE-SU-2020:1823-1	Not reported
Suse	ntp	rpm	linux enterprise server 15-ltss	`4.2.8p15-4.10.1`	Not reported	SUSE-SU-2020:1823-1	Not reported
Suse	ntp	rpm	linux enterprise server for sap applications 15	`4.2.8p15-4.10.1`	Not reported	SUSE-SU-2020:1823-1	Not reported
Opensuse	ntp	rpm	leap 15.2	`4.2.8p15-lp152.3.3.1`	Not reported	OPENSUSE-SU-2020:1007-1	Not reported
Suse	ntp	rpm	linux enterprise server 11 sp4-ltss	`4.2.8p15-64.16.1`	Not reported	SUSE-SU-2020:14415-1	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, 5:37:58 PM UTC

References

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