The remote host is missing an update to mailutils announced via advisory DSA 732-1.

https://secure1.securityspace.com/smysecure/catid.html?in=DSA%20732-1

infamous41md discovered several vulnerabilities in the GNU mailutils package which contains utilities for handling mail. These problems can lead to a denial of service or the execution of arbitrary code. The Common Vulnerabilities and Exposures project identifies the following vulnerabilities. CVE-2005-1520 Buffer overflow mail header handling may allow a remote attacker to execute commands with the privileges of the targeted user. CVE-2005-1521 Combined integer and heap overflow in the fetch routine can lead to the execution of arbitrary code. CVE-2005-1522 Denial of service in the fetch routine. CVE-2005-1523 Format string vulnerability can lead to the execution of arbitrary code. For the stable distribution (woody) these problems have been fixed in version 20020409-1woody2. For the testing distribution (sarge) these problems have been fixed in version 0.6.1-4. For the unstable distribution (sid) these problems have been fixed in version 0.6.1-4. We recommend that you upgrade your mailutils packages.