Kerberos 4 KDC program does not properly check for null termination of AUTH_MSG_KDC_REQUEST requests, which allows remote attackers to cause a denial of service via a malformed request.
https://euvd.enisa.europa.eu/vulnerability/EUVD-2000-0546
http://www.redhat.com/support/errata/RHSA-2000-031.html
http://www.cert.org/advisories/CA-2000-11.html
http://web.mit.edu/kerberos/www/advisories/krb4kdc.txt
http://ciac.llnl.gov/ciac/bulletins/k-051.shtml
http://archives.neohapsis.com/archives/bugtraq/2000-06/0064.html