:A security issue has been reported in FreeBSD, which can be exploited by malicious people to cause a DoS (Denial of Service).The security issue is caused due to an error within the processing of packets with IPv6 type 0 route headers. This can be exploited to cause a DoS due to high network traffic by sending specially crafted IPv6 packets to vulnerable systems.Solution:Update FreeBSD or apply patches.2007-04-24 11:42:42 UTC (RELENG_6, 6.2-STABLE)2007-04-26 23:42:23 UTC (RELENG_6_2, 6.2-RELEASE-p4)2007-04-26 23:41:59 UTC (RELENG_6_1, 6.1-RELEASE-p16)2007-04-24 11:44:23 UTC (RELENG_5, 5.5-STABLE)2007-04-26 23:41:27 UTC (RELENG_5_5, 5.5-RELEASE-p12)Patches (FreeBSD 5.5, 6.1, and 6.2):http://security.FreeBSD.org/patches/SA-07:03/ipv6.patchhttp://security.FreeBSD.org/patches/SA-07:03/ipv6.patch.ascProvided and/or discovered by:Philippe Biondi and Arnaud EbalardOriginal Advisory:FreeBSD:http://security.freebsd.org/advisories/FreeBSD-SA-07:03.ipv6.aschttp://www.secdev.org/conf/IPv6_RH_security-csw07.pdf

Original post by Pankaj