This indicates an attack attempt to exploit a Denial of Service vulnerability in MIT Kerberos.
The vulnerability is due to improper checks when the vulnerable application handles a maliciously crafted request. A remote attacker may be able to exploit this to cause a denial of service condition on the affected system via a crafted request.
MIT Kerberos 5 prior to 1.14
Denial of Service: Remote attackers can crash vulnerable systems or services
Apply the most recent upgrade or patch from the vendor