The remote Debian host is missing a security-related update.
Several vulnerabilities have been discovered in OpenJDK, an implementation of the Oracle Java platform, resulting in the execution of arbitrary code, breakouts of the Java sandbox, information disclosure, denial of service or insecure cryptography.
Upgrade the openjdk-7 packages. For the oldstable distribution (wheezy), these problems have been fixed in version 7u79-2.5.6-1~deb7u1. For the stable distribution (jessie), these problems have been fixed in version 7u79-2.5.6-1~deb8u1.