The remote host is missing updates announced in advisory RHSA-2006:0486.
Mailman is software to help manage email discussion lists.
A flaw was found in the way Mailman handles MIME multipart messages. An attacker could send a carefully crafted MIME multipart email message to a mailing list run by Mailman which would cause that particular mailing list to stop working. (CVE-2006-0052)
Users of Mailman should upgrade to this updated package, which contains backported patches to correct this issue.
Solution: Please note that this update is available via Red Hat Network. To use Red Hat Network, launch the Red Hat Update Agent with the following command: up2date