The remote Debian host is missing a security-related update.
Denis Andzakovic discovered that OpenLDAP, a free implementation of the Lightweight Directory Access Protocol, does not properly handle BER data. An unauthenticated remote attacker can use this flaw to cause a denial of service (slapd daemon crash) via a specially crafted packet.
Upgrade the openldap packages. For the oldstable distribution (wheezy), this problem has been fixed in version 2.4.31-2+deb7u1. For the stable distribution (jessie), this problem has been fixed in version 2.4.40+dfsg-1+deb8u1.