ntp_request.c in ntpd in NTP before 4.2.4p8, and 4.2.5, allows remote attackers to cause a denial of service (CPU and bandwidth consumption) by using MODE_PRIVATE to send a spoofed (1) request or (2) response packet that triggers a continuous exchange of MODE_PRIVATE error responses between two NTP daemons.
| Name | Vendor | Start Version | End Version |
|---|---|---|---|
| Ntp | Ntp | * | 4.2.2p4 (including) |
| Ntp | Ntp | 4.0.72 (including) | 4.0.72 (including) |
| Ntp | Ntp | 4.0.73 (including) | 4.0.73 (including) |
| Ntp | Ntp | 4.0.90 (including) | 4.0.90 (including) |
| Ntp | Ntp | 4.0.91 (including) | 4.0.91 (including) |
| Ntp | Ntp | 4.0.92 (including) | 4.0.92 (including) |
| Ntp | Ntp | 4.0.93 (including) | 4.0.93 (including) |
| Ntp | Ntp | 4.0.94 (including) | 4.0.94 (including) |
| Ntp | Ntp | 4.0.95 (including) | 4.0.95 (including) |
| Ntp | Ntp | 4.0.96 (including) | 4.0.96 (including) |
| Ntp | Ntp | 4.0.97 (including) | 4.0.97 (including) |
| Ntp | Ntp | 4.0.98 (including) | 4.0.98 (including) |
| Ntp | Ntp | 4.0.99 (including) | 4.0.99 (including) |
| Ntp | Ntp | 4.1.0 (including) | 4.1.0 (including) |
| Ntp | Ntp | 4.1.2 (including) | 4.1.2 (including) |
| Ntp | Ntp | 4.2.0 (including) | 4.2.0 (including) |
| Ntp | Ntp | 4.2.2 (including) | 4.2.2 (including) |
| Ntp | Ntp | 4.2.2p1 (including) | 4.2.2p1 (including) |
| Ntp | Ntp | 4.2.2p2 (including) | 4.2.2p2 (including) |
| Ntp | Ntp | 4.2.2p3 (including) | 4.2.2p3 (including) |
| Ntp | Ntp | 4.2.5 (including) | 4.2.5 (including) |