|Unspecified vulnerability in ISC BIND 9.0.x through 9.3.x, 9.4 before
9.4.3-P4, 9.5 before 9.5.2-P1, 9.6 before 9.6.1-P2, and 9.7 beta
before 9.7.0b3, with DNSSEC validation enabled and checking disabled
(CD), allows remote attackers to conduct DNS cache poisoning attacks
by receiving a recursive client query and sending a response that
contains an Additional section with crafted data, which is not
properly handled when the response is processed "at the same time as
requesting DNSSEC records (DO)," aka Bug 20438.