Vulnerability in the MySQL Server component of Oracle MySQL (subcomponent: Server: Thread Pooling). Supported versions that are affected are 5.5.54 and earlier, 5.6.35 and earlier and 5.7.17 and earlier. Easily exploitable vulnerability allows unauthenticated attacker with network access via multiple protocols to compromise MySQL Server. Successful attacks of this vulnerability can result in unauthorized ability to cause a hang or frequently repeatable crash (complete DOS) of MySQL Server.
Created mariadb tracking bugs for this issue:
Affects: fedora-all [bug 1443408]
Created community-mysql tracking bugs for this issue:
Affects: fedora-all [bug 1443407]
MySQL Enterprise Thread Pool is a feature of the MySQL Enterprise Edition, so this CVE is not applicable to the community MySQL version or MariaDB.
This CVE is most likely related to this entry in the MySQL release notes:
Thread Pool Notes
To improve thread_pool plugin performance, connection authentication and
initialization have been moved from the acceptor thread to the thread pool
worker threads that handle client connections. This enables the acceptor
thread to handle new connections at a higher rate with reduced latency. The
INFORMATION_SCHEMA TP_THREAD_GROUP_STATE table now contains a
CONNECT_THREAD_COUNT column that indicates the number of threads that are
processing or waiting to process connection initialization and
authentication. There can be a maximum of four connection threads per
thread group; these threads expire after a period of inactivity.
This change apparently aims to prevent exhausting all threads by an unauthenticated connections.