Crypto-NAK packets in ntpd in NTP 4.2.x before 4.2.8p4, and 4.3.x before 4.3.77 allows remote attackers to bypass authentication.
CVSS Details
- CVSS 3.1 Base Score: 9.8
- CVSS 3.1 Vector: (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H)
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Cisco Apic | — | Upgrade to the latest version of Cisco APIC to resolve this vulnerability. | May 11, 2026 | Oct 21, 2015 |
| Cisco Ise | — | — | Oct 21, 2025 | Oct 21, 2015 |
| Debian | — | Upgrade ntp | Nov 9, 2015 | Oct 27, 2015 |
| F5 Big Ip | — | Update F5 BIG-IP to the latest version | Jun 17, 2026 | Nov 10, 2015 |
| Freebsd | — | Upgrade FreeBSDUpgrade ntpUpgrade ntp-devel | Dec 10, 2025 | Oct 21, 2015 |
| Gentoo Linux | — | Upgrade app-emulation/xen.Upgrade app-emulation/pvgrub.Upgrade app-emulation/xen-pvgrub.Upgrade app-emulation/xen-tools.Upgrade net-misc/ntp. | Oct 30, 2017 | Aug 7, 2017 |
| Huawei Euleros 2_0_sp2 | — | Upgrade ntpdateUpgrade ntp | Jul 23, 2019 | Aug 7, 2017 |
| Huawei Euleros 2_0_sp3 | — | Upgrade ntpUpgrade sntpUpgrade ntpdate | Sep 25, 2019 | Aug 7, 2017 |
| Ntp | — | Upgrade NTP to version 4.2.8Upgrade NTP to version 4.3.77 | Feb 23, 2023 | Aug 7, 2017 |
| Oracle Solaris | — | Upgrade service/network/ntp to version 4.2.8.6-0.175.3.6.0.1.0 on Solaris 11.3 | May 29, 2017 | May 29, 2017 |
| Suse | — | Upgrade yast2-ntp-clientUpgrade ntp-debugsourceUpgrade ntpUpgrade ntp-docUpgrade yast2-ntp-client-devel-docUpgrade ntp-debuginfo | Dec 18, 2015 | Oct 27, 2015 |
| Ubuntu | — | Upgrade ntp | Nov 9, 2015 | Oct 27, 2015 |
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