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CVE-2009-3563

6.4 · MEDIUM

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 (…

Published Dec 9, 2009ntpEPSS 32.06%

Overview

CVE-2009-3563 is a medium-severity vulnerability affecting ntp ntp. It was published on December 9, 2009 and has a CVSS 2.0 base score of 6.4 (MEDIUM).

This vulnerability has a CVSS 2.0 base score of 6.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

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.

Remediation

Check the references section for vendor advisories and patches from ntp. Update ntp to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

Affected products

VendorProductVersionsStatus
ntpntp0Affected

References

Refftp://ftp.netbsd.org/pub/NetBSD/security/advisories/NetBSD-SA2010-005.txt.ascRefaix.software.ibm.com/aix/efixes/security/xntpd_advisory.ascRefbugs.debian.org/cgi-bin/bugreport.cgi?bug=560074Refkb.juniper.net/InfoCenter/index?page=content&id=JSA10673Refkb.juniper.net/InfoCenter/index?page=content&id=JSA10691Reflists.vmware.com/pipermail/security-announce/2010/000082.htmlRefmarc.info/?l=bugtraq&m=130168580504508&w=2Refmarc.info/?l=bugtraq&m=136482797910018&w=2Refsecunia.com/advisories/37629Refsecunia.com/advisories/37922

How CyberStrike helps

Frequently asked questions

What is CVE-2009-3563?

CVE-2009-3563 is a medium-severity vulnerability affecting ntp ntp. It was published on December 9, 2009 and has a CVSS 2.0 base score of 6.4 (MEDIUM).

How severe is CVE-2009-3563?

This vulnerability has a CVSS 2.0 base score of 6.4, rated MEDIUM. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2009-3563?

Check the references section for vendor advisories and patches from ntp. Update ntp to the latest patched version. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2009-3563?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2009-3563 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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