The remote host is missing an update to the system as announced in the referenced advisory FreeBSD-SA-04:16.fetch.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-04:16.fetch.asc

The fetch(1) utility is a tool for fetching files via FTP, HTTP, and HTTPS. An integer overflow condition in the processing of HTTP headers can result in a buffer overflow.