Unspecified vulnerability in Oracle MySQL 5.5.52 and earlier, 5.6.33 and earlier, and 5.7.15 and earlier allows remote administrators to affect confidentiality via vectors related to Server: Security: Encryption.
https://security.gentoo.org/glsa/201701-01
https://mariadb.com/kb/en/mariadb/mariadb-10028-release-notes/
http://www.securityfocus.com/bid/93735
http://www.oracle.com/technetwork/security-advisory/cpuoct2016-2881722.html