ntpd in ntp 4.2.x before 4.2.8p7 and 4.3.x before 4.3.92 allows authenticated users that know the private symmetric key to create arbitrarily-many ephemeral associations in order to win the clock selection of ntpd and modify a victim's clock via a Sybil attack. This issue exists because of an incomplete fix for CVE-2016-1549.
CVSS Details
- CVSS 3.1 Base Score: 5.3
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:N)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux | — | Upgrade ntp | May 11, 2018 | Mar 6, 2018 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Mar 6, 2018 |
| Debian | — | Upgrade ntp | Jul 30, 2024 | Mar 6, 2018 |
| F5 Big Ip | — | Update F5 BIG-IP to the latest version | Jun 17, 2026 | Mar 19, 2018 |
| Freebsd | — | Upgrade ntpUpgrade FreeBSDUpgrade ntp-devel | May 6, 2018 | Feb 28, 2018 |
| Gentoo Linux | — | Upgrade net-misc/ntp. | May 29, 2018 | Mar 6, 2018 |
| Hpux | — | Update NTP to the latest version | Dec 9, 2019 | Mar 6, 2018 |
| Ibm Aix | — | Apply the fix or workaround for ntp_advisory11Apply the fix or workaround for ntp_advisory10 | Aug 16, 2018 | Mar 6, 2018 |
| Ntp | — | Upgrade NTP to version 4.3.92Upgrade NTP to version 4.2.8 | Feb 23, 2023 | Mar 6, 2018 |
| Oracle Solaris | — | Upgrade service/network/ntp to version 4.2.8.11-0.175.3.31.0.4.0 on Solaris 11.3Upgrade service/network/ntp to version 4.2.8.12-11.4.8.0.1.3.0 on Solaris 11.4 | Apr 18, 2018 | Mar 6, 2018 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Mar 6, 2018 |
| Suse | — | Upgrade ntp-docUpgrade ntp | Mar 27, 2018 | Mar 6, 2018 |
| Ubuntu | — | Upgrade ntp | Nov 19, 2024 | Mar 6, 2018 |
Prioritise with Active Threat Intelligence
With curated Threat Intelligence, you can see which vulnerabilities truly put you at risk, prioritize what matters most, and act before attackers do.
Explore Intelligence Hub