Description
The receive function in ntp_proto.c in ntpd in NTP before 4.2.8 continues to execute after detecting a certain authentication error, which might allow remote attackers to trigger an unintended association change via crafted packets.
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 | 1:4.2.6.p5+dfsg-3.2 | — |
| Debian 7 | ntp | 1:4.2.6.p5+dfsg-2+deb7u1 | DSA-3108-1 |
| Debian 6.0 | ntp | 1:4.2.6.p2+dfsg-1+deb6u1 | DLA-116-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 14.04 LTS | ntp | 1:4.2.6.p5+dfsg-3ubuntu2.14.04.1 | USN-2449-1 |
Red Hat
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 7 | ntp +4 | 4.2.6p5-19.el7_0 | RHSA-2014:2024 |
| RHEL 6 | ntp +3 | 4.2.6p5-2.el6_6 | RHSA-2014:2024 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| RHEL 6.5 EUS | ntp +3 | 4.2.6p5-2.el6_5 | RHSA-2015:0104 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | ntp | 4.2.8p9-1.1 | openSUSE-SU-2024:10181-1 |
Oracle Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Oracle Linux 7 | ntp +4 | 4.2.6p5-19.el7_0 | ELSA-2014-2024 |
Advisories 9
- RHSA-2015:0104 Red Hat Security Advisory: ntp security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- RHSA-2014:2024 Red Hat Security Advisory: ntp security update Red Hat Security Advisories (RHSA) · Jun 27, 2026
- DSA-3108-1 ntp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-116-1 ntp - security update Debian Security (DSA / DLA) · Mar 9, 2026
- USN-2449-1 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
- ICSA-14-353-01C Network Time Protocol Vulnerabilities CISA ICS & IT advisories · Jun 6, 2025
- VDE-2022-032 AUMA: Multiple Vulnerabilities in Automation Runtime NTP Service CERT@VDE · Aug 9, 2022
- ELSA-2014-2024 Important: ntp security update (Oracle Linux 7) Oracle Linux Security Advisories (ELSA) · Dec 20, 2014
References
- 20141222 Multiple Vulnerabilities in ntpd Affecting Cisco Products vendor-advisory
- HPSBGN03277 vendor-advisory
- https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04790232
- https://kc.mcafee.com/corporate/index?page=content&id=SB10103
- 71758 vdb-entry
- http://advisories.mageia.org/MGASA-2014-0541.html
- VU#852879 third-party-advisory
- HPSBUX03240 vendor-advisory
- 62209 third-party-advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- RHSA-2015:0104 vendor-advisory
- HPSBOV03505 vendor-advisory
- http://bugs.ntp.org/show_bug.cgi?id=2670
- openSUSE-SU-2014:1670 vendor-advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=1176040
- http://support.ntp.org/bin/view/Main/SecurityNotice
- http://bk1.ntp.org/ntp-dev/?PAGE=patch&REV=548ad06feXHK1HlZoY-WZVyynwvwAg
- MDVSA-2015:003 vendor-advisory
- https://www.arista.com/en/support/advisories-notices/security-advisories/1047-security-advisory-8