The most common bind configuration which is affected by this flaw is, if the server, in addition to performing NXDOMAIN redirection for recursive clients, is also serving a local copy of the root zone or using mirroring to provide the root zone, although other configurations are also possible.
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A flaw was found in the way "nxdomain-redirect" feature was implemented in bind. An attacker could use this flaw on a server with a vulnerable configuration to cause bind to exit, denying service to other clients.