An attacker can spoof a packet from a legitimate ntpd server with an origin timestamp that matches the peer->dst timestamp recorded for that server. After making this switch, the client in NTP 4.2.8p4 and earlier and NTPSec aa48d001683e5b791a743ec9c575aaf7d867a2b0c will reject all future legitimate server responses. It is possible to force the victim client to move time after the mode has been changed. ntpq gives no indication that the mode has been switched.
CVSS Details
- CVSS 3.1 Base Score: 7.2
- CVSS 3.0 Vector: (CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:C/C:N/I:L/A:L)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux | — | Upgrade ntp | Jul 1, 2017 | Jun 2, 2016 |
| Centos_linux | — | Upgrade ntpUpgrade sntpUpgrade ntpdateUpgrade ntp-docUpgrade ntp-perl | May 31, 2016 | May 31, 2016 |
| Cisco Apic | — | Upgrade to the latest version of Cisco APIC to resolve this vulnerability. | May 11, 2026 | Apr 28, 2016 |
| Debian | — | Upgrade ntp | Jul 27, 2016 | Jul 25, 2016 |
| F5 Big Ip | — | Update F5 BIG-IP to the latest version | Jun 17, 2026 | Jun 3, 2016 |
| Freebsd | — | Upgrade ntp-develUpgrade FreeBSDUpgrade ntp | Dec 10, 2025 | Apr 27, 2016 |
| Gentoo Linux | — | Upgrade net-misc/ntp. | Oct 30, 2017 | Jan 6, 2017 |
| Ntp | — | Upgrade to the latest version of NTP | Feb 23, 2023 | Jan 6, 2017 |
| Oracle Solaris | — | Upgrade service/network/ntp to version 4.2.8.8-0.175.3.12.0.1.0 on Solaris 11.3 | May 29, 2017 | Jan 6, 2017 |
| Oracle_linux | — | Upgrade ntpUpgrade sntpUpgrade ntpdateUpgrade ntp-docUpgrade ntp-perl | Jan 6, 2017 | Jan 6, 2017 |
| Redhat_linux | — | Upgrade ntpdateUpgrade ntp-debuginfoUpgrade ntp-docUpgrade sntpUpgrade ntpUpgrade ntp-perl | Aug 3, 2016 | Aug 3, 2016 |
| Suse | — | Upgrade ntp-docUpgrade ntp | May 11, 2016 | May 11, 2016 |
| Ubuntu | — | Upgrade ntp | Oct 7, 2016 | Oct 5, 2016 |
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