The remote host is missing an update to the system as announced in the referenced advisory.
Update your system with the appropriate patches or software upgrades. http://www.gentoo.org/security/en/glsa/glsa-200509-13.xml http://www.vuxml.org/freebsd/271498a9-2cd4-11da-a263-0001020eed82.html
The following packages are affected: clamav clamav-devel CVE-2005-2919 libclamav/fsg.c in Clam AntiVirus (ClamAV) before 0.87 allows remote attackers to cause a denial of service (infinite loop) via a crafted FSG packed executable. CVE-2005-2920 Buffer overflow in libclamav/upx.c in Clam AntiVirus (ClamAV) before 0.87 allows remote attackers to execute arbitrary code via a crafted UPX packed executable.