NTP before 4.2.8p9 changes the peer structure to the interface it receives the response from a source, which allows remote attackers to cause a denial of service (prevent communication with a source) by sending a response for a source to an interface the source does not use.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon Linux Ami 2 | — | Upgrade ntp-perlUpgrade ntp-docUpgrade ntpUpgrade ntp-debuginfoUpgrade ntpdateUpgrade sntp | Apr 27, 2020 | Jan 13, 2017 |
| Amazon_linux | — | Upgrade ntp | Jan 5, 2017 | Jan 4, 2017 |
| Arch Linux | — | Upgrade to the latest version of Arch Linux | Jul 11, 2025 | Jan 13, 2017 |
| Centos_linux | — | Upgrade ntp-debuginfoUpgrade ntp-docUpgrade ntpdateUpgrade sntpUpgrade ntp-perlUpgrade ntp | Feb 7, 2017 | Jan 13, 2017 |
| Cisco Apic | — | Upgrade to the latest version of Cisco APIC to resolve this vulnerability. | May 11, 2026 | Nov 23, 2016 |
| Cisco Ise | — | — | Oct 21, 2025 | Nov 23, 2016 |
| Debian | — | Upgrade ntp | Jul 30, 2024 | Jan 13, 2017 |
| Freebsd | — | Upgrade ntpUpgrade ntp-devel | Nov 22, 2016 | Nov 22, 2016 |
| Hpux | — | Update NTP.NTP-RUN to the latest versionUpdate NTP.NTP-AUX to the latest version | Aug 11, 2017 | Jan 13, 2017 |
| Huawei Euleros 2_0_sp1 | — | Upgrade ntpUpgrade ntpdate | Nov 30, 2017 | Jan 13, 2017 |
| Huawei Euleros 2_0_sp2 | — | Upgrade ntpUpgrade ntpdate | Nov 30, 2017 | Jan 13, 2017 |
| Ntp | — | Upgrade to the latest version of NTP | Feb 23, 2023 | Jan 13, 2017 |
| Oracle Solaris | — | Upgrade service/network/ntp to version 4.2.8.9-0.175.3.17.0.1.0 on Solaris 11.3 | May 29, 2017 | Jan 13, 2017 |
| Oracle_linux | — | Upgrade sntpUpgrade ntpdateUpgrade ntpUpgrade ntp-docUpgrade ntp-perl | Feb 7, 2017 | Nov 21, 2016 |
| Redhat_linux | — | Upgrade ntp-debuginfoNo solution existsUpgrade ntp-perlUpgrade ntpdateUpgrade ntp-docUpgrade sntpUpgrade ntp | Feb 8, 2017 | Jan 13, 2017 |
| Suse | — | Upgrade ntp-docUpgrade ntp | Dec 20, 2016 | Dec 19, 2016 |
| Ubuntu | — | Upgrade ntp | Jul 6, 2017 | Jan 13, 2017 |
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