The remote Debian host is missing a security-related update.
Several issues have been discovered in the MySQL database server. The vulnerabilities are addressed by upgrading MySQL to the new upstream version 5.5.55, which includes additional changes, such as performance improvements, bug fixes, new features, and possibly incompatible changes. Please see the MySQL 5.5 Release Notes and Oracle's Critical Patch Update advisory for further details : - https://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5 -55.html - http://www.oracle.com/technetwork/security-advisory/cpua pr2017-3236618.html
Upgrade the mysql-5.5 packages. For the stable distribution (jessie), these problems have been fixed in version 5.5.55-0+deb8u1.