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+.. Copyright (C) Internet Systems Consortium, Inc. ("ISC")
+..
+.. SPDX-License-Identifier: MPL-2.0
+..
+.. This Source Code Form is subject to the terms of the Mozilla Public
+.. License, v. 2.0.  If a copy of the MPL was not distributed with this
+.. file, you can obtain one at https://mozilla.org/MPL/2.0/.
+..
+.. See the COPYRIGHT file distributed with this work for additional
+.. information regarding copyright ownership.
+
+Notes for BIND 9.16.20
+----------------------
+
+Security Fixes
+~~~~~~~~~~~~~~
+
+- Fixed an assertion failure that occurred in ``named`` when it
+  attempted to send a UDP packet that exceeded the MTU size, if
+  Response Rate Limiting (RRL) was enabled. (CVE-2021-25218) :gl:`#2856`
+
+- ``named`` failed to check the opcode of responses when performing zone
+  refreshes, stub zone updates, and UPDATE forwarding. This could lead
+  to an assertion failure under certain conditions and has been
+  addressed by rejecting responses whose opcode does not match the
+  expected value. :gl:`#2762`
+
+Feature Changes
+~~~~~~~~~~~~~~~
+
+- Testing revealed that setting the thread affinity for various types of
+  ``named`` threads led to inconsistent recursive performance, as
+  sometimes multiple sets of threads competed over a single resource.
+
+  Due to the above, ``named`` no longer sets thread affinity. This
+  causes a slight dip of around 5% in authoritative performance, but
+  recursive performance is now consistently improved. :gl:`#2822`
+
+- CDS and CDNSKEY records can now be published in a zone without the
+  requirement that they exactly match an existing DNSKEY record, as long
+  as the zone is signed with an algorithm represented in the CDS or
+  CDNSKEY record. This allows a clean rollover from one DNS provider to
+  another when using a multiple-signer DNSSEC configuration. :gl:`#2710`
+
+Bug Fixes
+~~~~~~~~~
+
+- Authentication of ``rndc`` messages could fail if a ``controls``
+  statement was configured with multiple key algorithms for the same
+  listener. This has been fixed. :gl:`#2756`
+
+Known Issues
+~~~~~~~~~~~~
+
+- There are no new known issues with this release. See :ref:`above
+  <relnotes_known_issues>` for a list of all known issues affecting this
+  BIND 9 branch.