The remote host is missing an update to the system as announced in the referenced advisory.
The following packages are affected: clamav clamav-devel
CVE-2006-1989 Buffer overflow in the get_database function in the HTTP client in Freshclam in ClamAV 0.80 to 0.88.1 might allow remote web servers sites to execute arbitrary code via long HTTP headers.
Solution: Update your system with the appropriate patches or software upgrades.