The isakmp_info_recv function in src/racoon/isakmp_inf.c in racoon in Ipsec-tools before 0.6.7 allows remote attackers to cause a denial of service (tunnel crash) via crafted (1) DELETE (ISAKMP_NPTYPE_D) and (2) NOTIFY (ISAKMP_NPTYPE_N) messages.
https://rhn.redhat.com/errata/RHSA-2007-0342.html
https://oval.cisecurity.org/repository/search/definition/oval%3Aorg.mitre.oval%3Adef%3A10504
https://exchange.xforce.ibmcloud.com/vulnerabilities/33541
http://www.vupen.com/english/advisories/2007/1310
http://www.ubuntu.com/usn/usn-450-1
http://www.securitytracker.com/id?1018086
http://www.securityfocus.com/bid/23394
http://www.novell.com/linux/security/advisories/2007_8_sr.html
http://www.mandriva.com/security/advisories?name=MDKSA-2007:084
http://www.debian.org/security/2007/dsa-1299
http://sourceforge.net/project/shownotes.php?release_id=499192&group_id=74601
http://sourceforge.net/mailarchive/message.php?msg_name=20070406123739.GA1546%40zen.inc
http://security.gentoo.org/glsa/glsa-200705-09.xml
http://secunia.com/advisories/25560
http://secunia.com/advisories/25322
http://secunia.com/advisories/25142
http://secunia.com/advisories/25072
http://secunia.com/advisories/24833