The remote Debian host is missing a security-related update.
Two related issues have been discovered in Expat, a C library for parsing XML. - CVE-2012-6702 It was introduced when CVE-2012-0876 was addressed. Stefan Sorensen discovered that the use of the function XML_Parse() seeds the random number generator generating repeated outputs for rand() calls. - CVE-2016-5300 It is the product of an incomplete solution for CVE-2012-0876. The parser poorly seeds the random number generator allowing an attacker to cause a denial of service (CPU consumption) via an XML file with crafted identifiers. You might need to manually restart programs and services using expat libraries.
Upgrade the expat packages. For the stable distribution (jessie), these problems have been fixed in version 2.1.0-6+deb8u3.