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.

The DNS implementation in DeleGate 8.10.2 and earlier allows remote attackers to cause a denial of service via a compressed DNS packet with a label length byte with an incorrect offset, which could trigger an infinite loop.