An Error in DDNS Processing of DHCPv6 Leases Can Cause a Crash in ISC dhcpd
Due to improper handling of a DHCPv6 lease structure, ISC DHCP servers that are serving IPv6 address pools AND using Dynamic DNS can encounter a segmentation fault error while updating lease status under certain conditions. The potential exists for this condition to be intentionally triggered, resulting in effective denial of service to clients expecting service from the affected server. Users of affected versions who use DHCPv6 and Dynamic DNS should upgrade to version 4.2.3-P2.
CVSS Score: 6.1
For more information on the Common Vulnerability Scoring System and to obtain your specific environmental score please visit:
No known workarounds, please upgrade if you are running an affected version of ISC DHCP and you use Dynamic DNS and IPv6.
Upgrade to ISC DHCP 4.2.3-P2
DHCP 4.2.3-P2 can be downloaded from the following location: http://www.isc.org/software/dhcp
Document Revision History:
1.0 05 January 2012 - Phase I notified
1.1 11 January 2012 - Phase II & III notified
1.2 12 January 2012 - Public Release
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