The read_network_packet function in ntp_io.c in ntpd in NTP 4.x before 4.2.8p1 on Linux and OS X does not properly determine whether a source IP address is an IPv6 loopback address, which makes it easier for remote attackers to spoof restricted packets, and read or write to the runtime state, by leveraging the ability to reach the ntpd machine's network interface with a packet from the ::1 address.
CVSS Details
- CVSS 3.1 Base Score: 7.5
Covered by Rapid7
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Debian | — | Upgrade ntp | Nov 9, 2015 | Oct 5, 2015 |
| F5 Big Ip | — | Update F5 BIG-IP to the latest version | Jun 17, 2026 | Nov 7, 2015 |
| Ntp | — | Upgrade NTP to version 4.2.8 | Feb 23, 2023 | Oct 6, 2015 |
| Oracle_linux | — | Upgrade ntpUpgrade ntpdateUpgrade ntp-docUpgrade ntp-perlUpgrade sntp | Oct 16, 2024 | Oct 4, 2015 |
| Redhat_linux | — | No solution exists | Jul 9, 2025 | Feb 4, 2015 |
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