The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-04:10.cvs.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-04:10.cvs.asc

The Concurrent Versions System (CVS) is a version control system. It may be used to access a repository locally, or to access a `remote repository' using a number of different methods. When accessing a remote repository, the target machine runs the CVS server to fulfill client requests. Due to a programming error in code used to parse data received from the client, malformed data can cause a heap buffer to overflow, allowing the client to overwrite arbitrary portions of the server's memory.