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Date: Wed, 28 Apr 2021 17:09:42 -0800
From: Michael McNally <>
Cc: "" <>
Subject: ISC discloses three BIND vulnerabilities (CVE-2021-25214,
 CVE-2021-25215, and CVE-2021-25216)

On April 28, 2021, we (Internet Systems Consortium) disclosed three
vulnerabilities affecting our BIND 9 software:

    CVE-2021-25214: A broken inbound incremental zone update (IXFR)
    can cause named to terminate unexpectedly

    CVE-2021-25215: An assertion check can fail while answering queries for
    DNAME records that require the DNAME to be processed to resolve itself

    CVE-2021-25216: A second vulnerability in BIND's GSSAPI security policy
    negotiation can be targeted by a buffer overflow attack

New versions of BIND are available from

Operators and package maintainers who prefer to apply patches selectively can
find individual vulnerability-specific patches in the "patches" subdirectory
of the release directories for our two stable release branches (9.11 and 9.16)

With the public announcement of these vulnerabilities, the embargo
period is ended and any updated software packages that have been
prepared may be released.

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