The remote host is missing an update to clamav announced via advisory DSA 1497-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%201497-1

Several vulnerabilities have been discovered in the Clam anti-virus toolkit, which may lead to the execution of arbitrary or local denial of service. The Common Vulnerabilities and Exposures project identifies the following problems: CVE-2007-6595 It was discovered that temporary files are created insecurely, which may result in local denial of service by overwriting files. CVE-2008-0318 Silvio Cesare discovered an integer overflow in the parser for PE headers. For the stable distribution (etch), these problems have been fixed in version 0.90.1dfsg-3etch10. In addition to these fixes, this update also incorporates changes from the upcoming point release of the stable distribution (non-free RAR handling code was removed). The version of clamav in the old stable distribution (sarge) is no longer supported with security updates. We recommend that you upgrade your clamav packages.