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.

CVSS v2.0 NVD

6.4 MEDIUMAV:N/AC:L/Au:N/C:N/I:P/A:P

EPSS

32.06% chance of exploitation in the next 30 days, 98th percentile

Published

2009-12-09

Updated

2024-08-07

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/auxiliary/dos/ntp/ntpd_reserved_dos.rb

Security advisories

• http://support.ntp.org/bin/view/Main/SecurityNotice#DoS_attack_from_certain_NTP_mode
• http://www.debian.org/security/2009/dsa-1948
• http://www.kb.cert.org/vuls/id/568372
• http://www.securityfocus.com/bid/37255
• http://www.kb.cert.org/vuls/id/MAPG-7X7V6J
• http://www.kb.cert.org/vuls/id/MAPG-7X7VD7
• https://www.kb.cert.org/vuls/id/417980

References

• CVE Record
• NVD entry