mysql is vulnerable to denial of service (DoS). The vulnerability exists as remotely authenticated users can affect the availability through Server : InnoDB.
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www.oracle.com/technetwork/topics/security/cpuoct2015-2367953.html#AppendixMSQL
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mariadb.com/kb/en/mariadb/mariadb-10022-release-notes/
mariadb.com/kb/en/mariadb/mariadb-10023-release-notes/
mariadb.com/kb/en/mariadb/mariadb-10024-release-notes/
mariadb.com/kb/en/mariadb/mariadb-10025-release-notes/