Multiple unspecified vulnerabilities in DeleGate 9.x before 9.0.6 and 8.x before 8.11.6 allow remote attackers to cause a denial of service via crafted DNS responses messages that cause (1) a buffer over-read or (2) infinite recursion, which can trigger a segmentation fault or invalid memory access, as demonstrated by the OUSPG PROTOS DNS test suite.
https://exchange.xforce.ibmcloud.com/vulnerabilities/26081
http://www.vupen.com/english/advisories/2006/1506
http://www.vupen.com/english/advisories/2006/1505
http://www.securityfocus.com/bid/17691
http://www.niscc.gov.uk/niscc/docs/re-20060425-00312.pdf?lang=en
http://www.niscc.gov.uk/niscc/docs/br-20060425-00311.html?lang=en
http://www.kb.cert.org/vuls/id/955777