Vulnerability in NTP
CVE-2009-3563
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.
Published · last modified .
CVSS v2 metric
CVSS v2 base score 6.4 (Medium). Vector: AV:N/AC:L/Au:N/C:N/I:P/A:P. This CVE predates CVSS v3 and has no v3 score from NVD.
EPSS exploit prediction
EPSS: 0.321 (98.3th percentile), scored .
Moderate probability of exploitation in the next 30 days — watch for active exploitation reports. 98th percentile — 98.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.321 · newest: 0.321 · change: 0.000
Affected products
- NTP — versions 4.0.72, 4.0.73, 4.0.90
Public proof-of-concept exploits
References
- www.kb.cert.org/vuls/id/568372 (US Government Resource, Patch, third-party-advisory)
- secunia.com/advisories/38832 (third-party-advisory)
- kb.juniper.net/InfoCenter/index
- oval.cisecurity.org/repository/search/definition/oval:org.mitre.oval:def:11225 (signature, vdb-entry)
- support.avaya.com/css/P8/documents/100071808
- secunia.com/advisories/38794 (third-party-advisory)
- lists.vmware.com/pipermail/security-announce/2010/000082.html (mailing-list)
- www.redhat.com/archives/fedora-package-announce/2009-December/msg00809.html (vendor-advisory)
- bugzilla.redhat.com/show_bug.cgi
- secunia.com/advisories/38764 (third-party-advisory)
Frequently asked questions
- What is CVE-2009-3563?
- CVE-2009-3563 is a vulnerability in NTP. Published 2009-12-09.
- Is CVE-2009-3563 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.