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Date: Wed, 18 Aug 2021 10:08:11 -0800
From: Michael McNally <>
Subject: ISC has disclosed a vulnerability in BIND (CVE-2021-25218)

On August 18, 2021, we (Internet Systems Consortium) have disclosed a
vulnerability affecting our BIND software:

    CVE-2021-25218: A too-strict assertion check could be triggered when
    responses in BIND 9.16.19 and 9.17.16 require UDP fragmentation if
    RRL is in use

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 affected release branches (9.16 and 9.17)
The BIND 9.11 branch was not affected by CVE-2021-25218.


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


Michael McNally
(for ISC Security Officer)

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