The remote host is missing an update to junkbuster announced via advisory DSA 713-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20713-1

Several bugs have been found in junkbuster, a HTTP proxy and filter. The Common Vulnerability and Exposures project identifies the following vulnerabilities: CVE-2005-1108 James Ranson discovered that an attacker can modify the referrer setting with a carefully crafted URL by accidently overwriting a global variable. CVE-2005-1109 Tavis Ormandy from the Gentoo Security Team discovered several heap corruptions due to inconsistent use of an internal function that can crash the daemon or possibly lead to the execution of arbitrary code. For the stable distribution (woody) these problems have been fixed in version 2.0.2-0.2woody1. The unstable distribution (sid) doesn't contain the junkbuster package anymore. We recommend that you upgrade your junkbuster package.