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://web.mit.edu/kerberos/advisories/MITKRB5-SA-2010-007.txt http://osvdb.org/69607 http://www.vuxml.org/freebsd/4ccbd40d-03f7-11e0-bf50-001a926c7637.html

The following package is affected: krb5 CVE-2010-4021 The Key Distribution Center (KDC) in MIT Kerberos 5 (aka krb5) 1.7 does not properly restrict the use of TGT credentials for armoring TGS requests, which might allow remote authenticated users to impersonate a client by rewriting an inner request, aka a 'KrbFastReq forgery issue.'