CVE catalog
CVE-2009-3563
ntp - denial of service
- Severity
- Unknown
- Published
- Updated
- Source
- [NVD] · [CVE record]
- EPSS
- 32.06% · Oct 25, 2026
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.
Vulnerable and fixed packages
Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.
| Distribution | Package | Release | Version | Status |
|---|---|---|---|---|
| Debian | ntp | 11 | 1:4.2.4p8+dfsg-1 | fixed |
| Debian | ntp | 4.0 | 1:4.2.2.p4+dfsg-2 | vulnerable |
| Debian | ntp | 4.0 | 1:4.2.2.p4+dfsg-2etch1 | vulnerable |
| Debian | ntp | 4.0 | 1:4.2.2.p4+dfsg-2etch2 | vulnerable |
| Debian | ntp | 4.0 | 1:4.2.2.p4+dfsg-2etch3 | vulnerable |
| Debian | ntp | 4.0 | 1:4.2.2.p4+dfsg-2etch4 | fixed |
| Debian | ntp | 5.0 | 1:4.2.4p4+dfsg-8 | vulnerable |
| Debian | ntp | 5.0 | 1:4.2.4p4+dfsg-8lenny2 | vulnerable |
| Debian | ntp | 5.0 | 1:4.2.4p4+dfsg-8lenny3 | fixed |
Fixed-version evidence
| Distribution | Package | Type | Release | Fixed version | Urgency | Origin | Bugs |
|---|---|---|---|---|---|---|---|
| Debian | ntp | deb | 11 | 1:4.2.4p8+dfsg-1 | Not reported | DEBIAN-CVE-2009-3563 | Not reported |
| Debian | ntp | deb | 4.0 | 1:4.2.2.p4+dfsg-2etch4 | Not reported | DSA-1948-1 | Not reported |
| Debian | ntp | deb | 5.0 | 1:4.2.4p4+dfsg-8lenny3 | Not reported | DSA-1948-1 | Not reported |
OpenFactory catalog packages
No matching packages in this catalog.
Observed: