The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-04:05.openssl.asc
Upgrade your system to the appropriate stable release or security branch dated after the correction date https://secure1.securityspace.com/smysecure/catid.html?in=FreeBSD-SA-04:05.openssl.asc
FreeBSD includes software from the OpenSSL Project. The OpenSSL Project is a collaborative effort to develop a robust, commercial- grade, full-featured, and Open Source toolkit implementing the Secure Sockets Layer (SSL v2/v3) and Transport Layer Security (TLS v1) protocols as well as a full-strength general purpose cryptography library. When processing an SSL/TLS ChangeCipherSpec message, OpenSSL may fail to check that a new cipher has been previously negotiated. This may result in a null pointer dereference.