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 5.5.60, which includes additional changes. Please see the MySQL 5.5 Release Notes and Oracle's Critical Patch Update advisory for further details :
Upgrade the mysql-5.5 packages. For the oldstable distribution (jessie), these problems have been fixed in version 5.5.60-0+deb8u1.