Description
NTP before 4.2.8p7 and 4.3.x before 4.3.92, when mode7 is enabled, allows remote attackers to cause a denial of service (ntpd abort) by using the same IP address multiple times in an unconfig 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 | 1:4.2.8p7+dfsg-1 | — |
| Debian 8 | ntp | 1:4.2.6.p5+dfsg-7+deb8u2 | DSA-3629-1 |
| Debian 7 | ntp | 1:4.2.6.p5+dfsg-2+deb7u7 | DLA-559-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | ntp | 1:4.2.8p4+dfsg-3ubuntu5.3 | USN-3096-1 |
| Ubuntu 14.04 LTS | ntp | 1:4.2.6.p5+dfsg-3ubuntu2.14.04.10 | USN-3096-1 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 SP1 | ntp | 4.2.8p7-11.1 | SUSE-SU-2016:1291-1 |
| SLES 12 | ntp | 4.2.8p8-46.8.1 | SUSE-SU-2016:1568-1 |
| SLES 11 SP4 | ntp | 4.2.8p7-11.1 | SUSE-SU-2016:1278-1 |
| SLES 11 SP3 | ntp | 4.2.8p7-44.1 | SUSE-SU-2016:1471-1 |
| SLES 11 SP2 | ntp | 4.2.8p7-44.1 | SUSE-SU-2016:1471-1 |
Show 6 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 SP1 | ntp | 4.2.8p7-11.1 | SUSE-SU-2016:1291-1 |
| SLES for SAP 12 | ntp | 4.2.8p8-46.8.1 | SUSE-SU-2016:1568-1 |
| SLES for SAP 11 SP4 | ntp | 4.2.8p7-11.1 | SUSE-SU-2016:1278-1 |
| SUSE OpenStack Cloud 5 | ntp | 4.2.8p7-44.1 | SUSE-SU-2016:1471-1 |
| SUSE Manager Proxy 2.1 | ntp | 4.2.8p7-44.1 | SUSE-SU-2016:1471-1 |
| SUSE Manager 2.1 | ntp | 4.2.8p7-44.1 | SUSE-SU-2016:1471-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | ntp | 4.2.8p9-1.1 | openSUSE-SU-2024:10181-1 |
Advisories 9
- DLA-559-1 ntp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DSA-3629-1 ntp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-3096-1 ntp vulnerabilities Ubuntu Security Notices (USN) · Feb 10, 2026
- openSUSE-SU-2024:10181-1 ntp-4.2.8p9-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1471-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1568-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1291-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- SUSE-SU-2016:1278-1 Security update for ntp SUSE / openSUSE Security Updates · Feb 4, 2026
- VDE-2022-032 AUMA: Multiple Vulnerabilities in Automation Runtime NTP Service CERT@VDE · Aug 9, 2022
References
- DSA-3629 vendor-advisory
- 88180 vdb-entry
- VU#718152 third-party-advisory
- 1035705 vdb-entry
- http://www.oracle.com/technetwork/topics/security/bulletinapr2016-2952098.html
- https://security.netapp.com/advisory/ntap-20171004-0002/
- http://support.ntp.org/bin/view/Main/NtpBug3011
- FreeBSD-SA-16:16 vendor-advisory
- GLSA-201607-15 vendor-advisory