Description
The broadcast mode replay prevention functionality in ntpd in NTP before 4.2.8p9 allows remote attackers to cause a denial of service (reject broadcast mode packets) via a crafted broadcast mode packet.
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 | 1:4.2.8p9+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 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP2 | ntp | 4.2.8p9-55.1 | SUSE-SU-2016:3195-1 |
| SLES 12 SP1 | ntp | 4.2.8p9-55.1 | SUSE-SU-2016:3195-1 |
| SLES 12 | ntp | 4.2.8p9-46.18.1 | SUSE-SU-2016:3196-1 |
| SLES 11 SP4 | ntp | 4.2.8p9-57.2 | SUSE-SU-2016:3193-1 |
| SLES 11 SP3 | ntp | 4.2.8p9-48.9.1 | SUSE-SU-2017:0255-1 |
Show 9 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 11 SP2 | ntp | 4.2.8p9-48.9.1 | SUSE-SU-2017:0255-1 |
| SLES for SAP 12 SP2 | ntp | 4.2.8p9-55.1 | SUSE-SU-2016:3195-1 |
| SLES for SAP 12 SP1 | ntp | 4.2.8p9-55.1 | SUSE-SU-2016:3195-1 |
| SLES for SAP 12 | ntp | 4.2.8p9-46.18.1 | SUSE-SU-2016:3196-1 |
| SLES for SAP 11 SP4 | ntp | 4.2.8p9-57.2 | SUSE-SU-2016:3193-1 |
| SUSE OpenStack Cloud 5 | ntp | 4.2.8p9-48.9.1 | SUSE-SU-2017:0255-1 |
| SUSE Manager Proxy 2.1 | ntp | 4.2.8p9-48.9.1 | SUSE-SU-2017:0255-1 |
| SUSE Manager 2.1 | ntp | 4.2.8p9-48.9.1 | SUSE-SU-2017:0255-1 |
| SUSE Linux Enterprise Point of Sale 11 SP3 | ntp | 4.2.8p9-48.9.1 | SUSE-SU-2017:0255-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | ntp | 4.2.8p9-1.1 | openSUSE-SU-2024:10181-1 |
Advisories 7
- USN-3349-1 ntp vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- SUSE-SU-2016:3193-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3195-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2017:0255-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:10181-1 ntp-4.2.8p9-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:3196-1 Security update for ntp SUSE / openSUSE Security Updates · May 2, 2025
- VDE-2022-032 AUMA: Multiple Vulnerabilities in Automation Runtime NTP Service CERT@VDE · Aug 9, 2022
References
- https://h20566.www2.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbux03706en_us
- USN-3707-2 vendor-advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03883en_us
- http://support.ntp.org/bin/view/Main/SecurityNotice#Recent_Vulnerabilities
- http://nwtime.org/ntp428p9_release/
- http://support.ntp.org/bin/view/Main/NtpBug3114
- VU#633847 third-party-advisory
- https://support.hpe.com/hpsc/doc/public/display?docLocale=en_US&docId=emr_na-hpesbhf03899en_us
- 1037354 vdb-entry
- https://bto.bluecoat.com/security-advisory/sa139
- FreeBSD-SA-16:39 vendor-advisory
- 94447 vdb-entry