Details for this vulnerability have not been published by NIST at this point. Descriptions from software vendor advisories for this issue are provided below.
From VID-198E6220-AC8B-11E9-A1C7-B499BAEBFEAF:
Oracle reports:
This Critical Patch Update contains 45 new security fixes for
Oracle MySQL. 4 of these vulnerabilities may be remotely exploitable
without authentication, i.e., may be exploited over a network without
requiring user credentials.
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