Description
util/ntp-keygen.c in ntp-keygen in NTP before 4.2.7p230 uses a weak RNG seed, which makes it easier for remote attackers to defeat cryptographic protection mechanisms via a brute-force attack.
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 |
| RHEL 5 | ntp | 4.2.2p1-18.el5_11 | RHSA-2014:2025 |
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 |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES 12 | ntp | 4.2.6p5-37.2 | SUSE-SU-2015:0274-1 |
Show 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 12 | ntp | 4.2.6p5-37.2 | SUSE-SU-2015:0274-1 |
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 11
- 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
- RHSA-2014:2025 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
- SUSE-SU-2015:0274-1 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
- 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
- http://bugs.ntp.org/show_bug.cgi?id=2666
- 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
- http://advisories.mageia.org/MGASA-2014-0541.html
- VU#852879 third-party-advisory
- HPSBUX03240 vendor-advisory
- RHSA-2014:2025 vendor-advisory
- 71762 vdb-entry
- https://bugzilla.redhat.com/show_bug.cgi?id=1176035
- 62209 third-party-advisory
- http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html
- RHSA-2015:0104 vendor-advisory
- HPSBOV03505 vendor-advisory
- http://bk1.ntp.org/ntp-dev/util/ntp-keygen.c?PAGE=diffs&REV=4eae1b72298KRoBQmX-y8URCiRPH5g
- http://support.ntp.org/bin/view/Main/SecurityNotice
- HPSBPV03266 vendor-advisory
- https://h20564.www2.hpe.com/portal/site/hpsc/public/kb/docDisplay?docId=emr_na-c04916783
- MDVSA-2015:003 vendor-advisory
- https://www.arista.com/en/support/advisories-notices/security-advisories/1047-security-advisory-8