Description
NTP before 4.2.8p10 and 4.3.x before 4.3.94 allows remote attackers to cause a denial of service (ntpd crash) via a malformed mode configuration directive.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 11 | ntp | 1:4.2.8p10+dfsg-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | ntp | 1:4.2.8p4+dfsg-3ubuntu5.5 | USN-3349-1 |
| Ubuntu 14.04 LTS | ntp | 1:4.2.6.p5+dfsg-3ubuntu2.14.04.11 | USN-3349-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | ntp +4 | 4.2.6p5-28.el7 | RHSA-2018:0855 |
| RHEL 6 | ntp +3 | 4.2.6p5-12.el6_9.1 | RHSA-2017:3071 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | ntp | 4.2.8p10-60.1 | SUSE-SU-2017:1048-1 |
| SLES 12 SP1 | ntp | 4.2.8p10-60.1 | SUSE-SU-2017:1048-1 |
| SLES 12 | ntp | 4.2.8p10-46.23.1 | SUSE-SU-2017:1047-1 |
| SLES 11 SP4 | ntp | 4.2.8p10-63.1 | SUSE-SU-2017:1052-1 |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP2 | ntp | 4.2.8p10-60.1 | SUSE-SU-2017:1048-1 |
| SLES for SAP 12 SP1 | ntp | 4.2.8p10-60.1 | SUSE-SU-2017:1048-1 |
| SLES for SAP 12 | ntp | 4.2.8p10-46.23.1 | SUSE-SU-2017:1047-1 |
| SLES for SAP 11 SP4 | ntp | 4.2.8p10-63.1 | SUSE-SU-2017:1052-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | ntp | 4.2.8p15-7.2 | openSUSE-SU-2024:11102-1 |
Amazon Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Amazon Linux 2 | ntp +4 | 4.2.6p5-28.amzn2.2.1 | ALAS2-2018-1009 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | ntp +4 | 4.2.6p5-28.0.1.el7 | ELSA-2018-0855 |
Advisories 11
- RHSA-2017:3071 Red Hat Security Advisory: ntp security update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- RHSA-2018:0855 Red Hat Security Advisory: ntp security, bug fix, and enhancement update Red Hat Security Advisories (RHSA) · Jun 26, 2026
- USN-3349-1 ntp vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- openSUSE-SU-2024:11102-1 ntp-4.2.8p15-7.2 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1048-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1052-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:1047-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- WID-SEC-2025-0370 Apple Mac OS: Mehrere Schwachstellen BSI CERT-Bund (WID) · Feb 13, 2025
- VDE-2022-032 AUMA: Multiple Vulnerabilities in Automation Runtime NTP Service CERT@VDE · Aug 9, 2022
- ALAS2-2018-1009 Moderate: ntp security update (Amazon Linux 2) Amazon Linux Security Center (ALAS) · May 10, 2018
- ELSA-2018-0855 Moderate: ntp security, bug fix, and enhancement update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Apr 16, 2018
References
- 1038123 vdb-entry
- https://support.apple.com/HT208144
- FreeBSD-SA-17:03 vendor-advisory
- 97050 vdb-entry
- RHSA-2017:3071 vendor-advisory
- http://support.ntp.org/bin/view/Main/NtpBug3389
- http://support.ntp.org/bin/view/Main/SecurityNotice#March_2017_ntp_4_2_8p10_NTP_Secu
- RHSA-2018:0855 vendor-advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03962en_us