The remote Debian host is missing a security update.
Several issues have been discovered in the MySQL database server. The vulnerabilities are addressed by upgrading MySQL to the new upstream version 5.5.57, 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-5-5-56.html https://dev.mysql.com/doc/relnotes/mysql/5.5/en/news-5-5-57.html http://www.oracle.com/technetwork/security-advisory/cpujul2017-3236622 .html For Debian 7 'Wheezy', these problems have been fixed in version 5.5.57-0+deb7u1. We recommend that you upgrade your mysql-5.5 packages. NOTE: Tenable Network Security has extracted the preceding description block directly from the DLA security advisory. Tenable has attempted to automatically clean and format it as much as possible without introducing additional issues.