diff --git a/ChangeLog.d/tls13-only-server.txt b/ChangeLog.d/tls13-only-server.txt
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+Security
+   * When negotiating TLS version on server side, do not fall back to the
+     TLS 1.2 implementation of the protocol if it is disabled.
+     - If the TLS 1.2 implementation was disabled at build time, a TLS 1.2
+       client could put the TLS 1.3-only server in an infinite loop processing
+       a TLS 1.2 ClientHello, resulting in a denial of service. Reported by
+       Matthias Mucha and Thomas Blattmann, SICK AG.
+     - If the TLS 1.2 implementation was disabled at runtime, a TLS 1.2 client
+       was able to successfully establish a TLS 1.2 connection with the server.
+       Reported by alluettiv on GitHub.